Teslima Dasbasi - Academia.edu (original) (raw)

Papers by Teslima Dasbasi

Research paper thumbnail of Novel PSt/PGMA/PIN ternary composite for SPE and analysis of some heavy metals in various cosmetics and food products by flame AAS

International Journal of Environmental Analytical Chemistry, Dec 15, 2020

In this investigation, a solid-phase extraction (SPE) process was improved for selective separati... more In this investigation, a solid-phase extraction (SPE) process was improved for selective separation of Cr, Cu, Fe, Mn, Pb and Zn ions on novel ternary composite. These heavy metals were analyzed by...

Research paper thumbnail of Clay Catalyzed Reactions of Indole and its Methyl Derivatives with α, β-unsaturated Carbonyl Compounds

Croatica Chemica Acta, 2014

Electrophilic substituons reactions of indole and 1-methylindole with methyl propiolate in the pr... more Electrophilic substituons reactions of indole and 1-methylindole with methyl propiolate in the presence of K-10 montmorillonite were obtained the formation of the corresponding methyl 3,3bis(indolyl)propanoates. The reaction of 1,3-dimethylindole with methyl propiolate was given methyl 3,3bis(1,3-dimethyl-1H-indol-2-yl)propanoate, methyl 1,5-dimethyl-1H-benzo[b]azepine-3-carboxylate and methyl 3,3,3-tris(1,3-dimethyl-1H-indol-2-yl)propanoate. The reaction of 1,3-dimethylindole with 2cyclopentenone was yielded a typical addition product, similarly the reaction of indole and 1-methylindole with 2-cyclopentenone were concluded the expected addition products only.

Research paper thumbnail of Synthesis, characterization and application of a new chelating resin for on-line separation, preconcentration and determination of Ag(I) by flame atomic absorption spectrometry

Talanta, 2013

A simple and reliable on-line separation/preconcentration procedure was developed for the determi... more A simple and reliable on-line separation/preconcentration procedure was developed for the determination of trace levels of Ag(I) by flame atomic absorption spectrometry. Poly[N-(3-methyl-1H-indol-1-yl)-2-methacrylamide-co-2-acrylamido-2-methyl-1-propane sulfonic acid-co-divinylbenzene] was synthesized and characterized as a new chelating resin for the first time. Ag(I) was sorbed on the chelating resin, from which it could be eluted with 3 mol L(-1) HCl and then introduced directly to the nebulizer-burner system for flame atomic absorption spectrometry. The parameters influential on the determination of Ag(I) ions such as the pH of the sample solution, amount of resin, eluent type, interfering ions and flow variables were studied. Under the optimum conditions, the calibration graph obtained was linear over the concentration range of 2-20 μg L(-1). The detection limit of the method (3σ) was 0.3 μg L(-1) while precision was 1.5% (n=25) at the level of 10 μg L(-1) Ag(I). The limit of quantification for the method, based on 20 σ, was 2.0 μg L(-1). The enrichment factor was found to be 65 while the optimized sample volume was 13.6 mL. The accuracy of the method was performed by analyzing certified reference materials. The developed method was applied successfully for the determination of silver in different water samples with satisfactory results.

Research paper thumbnail of Synthesis, characterization and application of a new chelating resin for solid phase extraction, preconcentration and determination of trace metals in some dairy samples by flame atomic absorption spectrometry

Food Chemistry, Nov 1, 2016

In this study, a simple and rapid solid phase extraction/preconcentration procedure was developed... more In this study, a simple and rapid solid phase extraction/preconcentration procedure was developed for determination of Cd(II), Co(II), Cr(III), Cu(II), Fe(III), Mn(II), Pb(II), and Zn(II) trace metals by flame atomic absorption spectrometry (FAAS). A new chelating resin, poly(N-cyclohexylacrylamide-co-divinylbenzene-co-2-acrylamido-2-methyl-1-propanesulfonic acid) (NCA-co-DVB-co-AMPS) (hereafter CDAP) was synthesized and characterized. The influences of the analytical parameters such as pH of the sample solution, type and concentration of eluent, flow rates of the sample and eluent, volume of the sample and eluent, amount of chelating resin, and interference of ions were examined. The limit of detection (LOD) of analytes were found (3s) to be in the range of 0.65-1.90μgL(-1). Preconcentration factor (PF) of 200 and the relative standard deviation (RSD) of ⩽2% were achieved (n=11). The developed method was applied for determination of analytes in some dairy samples and certified reference materials.

Research paper thumbnail of Indium triflate-catalyzed coupling of indoles with acyl phosphonates: synthesis of bis(indolyl)methane phosphonates

Tetrahedron, May 1, 2011

The coupling reaction of N-methylindole with alkyl and aryl phosphonate is described. The reactio... more The coupling reaction of N-methylindole with alkyl and aryl phosphonate is described. The reaction works in the presence of 10 mol % of indium triflate and furnished bis(indolyl)methane phosphonates in good yield and high selectivity.

Research paper thumbnail of A synthesized ternary polymer composite and its use for SPE of trace metals in Coffee, tea and legumes

Food Chemistry, Dec 1, 2021

A new synthesized ternary polymer composite, polystyrene/polyacrylonitrile/polyindole (PSt/PAN/PI... more A new synthesized ternary polymer composite, polystyrene/polyacrylonitrile/polyindole (PSt/PAN/PIN), was used as an adsorbent. The structure of synthesized composite was supported by FTIR, BET, X-RD, TGA, SEM and AFM technique. A SPE method with synthesized composite was developed for the preconcentration of chromium, copper, iron, manganese, lead and zinc ions. The adsorption capacity were found in the range of 37.4-56.7 mg g-1. Under the best conditions, the preconcentration factor of method was found as 100. Relative standard deviation was found at ≤ 3.3% (n = 11). The detection limits of analytes were obtained as: 0.9 μg L-1 for Cr(III), 1.2 μg L-1 for Cu(II), 2.0 μg L-1 for Fe(III), 1.4 μg L-1 for Mn(II), 0.9 μg L-1 for Pb(II) and 2.0 µg L-1 for Zn(II). Firstly, this SPE method was applied to certified reference material, and than coffee, tea, legumes. The trace metals was analyzed by flame atomic absorption spectrometry.

Research paper thumbnail of Novel PSt/PGMA/PIN ternary composite for SPE and analysis of some heavy metals in various cosmetics and food products by flame AAS

International Journal of Environmental Analytical Chemistry

In this investigation, a solid-phase extraction (SPE) process was improved for selective separati... more In this investigation, a solid-phase extraction (SPE) process was improved for selective separation of Cr, Cu, Fe, Mn, Pb and Zn ions on novel ternary composite. These heavy metals were analyzed by...

Research paper thumbnail of Determination of some trace metals with a new synthesized polymer resin by FAAS in various tea and herbal plants samples

Journal of Macromolecular Science, Part A, 2018

In this work, a new polymer resin with a functional groups capable of holding trace metals has be... more In this work, a new polymer resin with a functional groups capable of holding trace metals has been synthesized. The structure of polymer resin has been examined by BET-N 2 method analyzer, IR spectrometer, scanning electron microscope (SEM) and elemental microanalyser. The synthesized polymer resin was used for the simultaneous separation and preconcentration of the trace metals from various tea and herbal plants samples. After extraction process, flame atomic absorption spectrometry (FAAS) was used to determine the trace metals. The analytical parameters and solid phase extraction (SPE) performance such as pH, sample volume, flow rates of sample, flow rates of eluent, concentration, volume and type of eluent and effect of interference ions, were investigated. The limits of detection (DL) of the SPE procedure for trace metals, were calculated to be (3s) in the range of 0.9¡4.0 mg L ¡1 (n D 21) and the factors of preconcentration (PF) were obtained at 200 for Cd, Co, Cu, Fe, Ni and Zn, and at 50 for Cr, Mn and Pb ions and the relative standard deviation (RSD) at 2% (n D 11).

Research paper thumbnail of SPE and determination by FAAS of heavy metals using a new synthesized polymer resin in various water and dried vegetables samples

Journal of Macromolecular Science, Part A, 2018

Firstly, poly[phenyl thiadiazole methacrylamide-co-divinylbenzene-co-2-acrylamido-2-methylpropane... more Firstly, poly[phenyl thiadiazole methacrylamide-co-divinylbenzene-co-2-acrylamido-2-methylpropane sulfonic acid] (PTMAAm-co-DVB-co-AMPS), a new polymer resin was synthesized. This polymer resin was characterized by elemental analyzer, X-ray diffractometer, scanning electron microscope (SEM) and IR spectrometer. The glass column packed with the synthesized polymer resin was used for solid phase extraction (SPE). At the same time, the analytes were separated and preconcentrated from various water, dried vegetables samples and standard reference material (CRM) with SPE and determined by flame atomic absorption spectrometer (FAAS). The experimental conditions of this method such as pH, flow rates of sample, flow rates of eluent, type / concentration / volume of eluent, sample volume and matrix ions were examined. The limits of detection (mg L ¡1) were calculated (3s) 0.9 for Mn(II), 1.4 for Cd(II), Co(II) and Zn(II), 1.5 for Cr(III), 2.2. for Cu(II), 1.9 for Pb(II),1.5 for Ni(II) and 1.9 for Fe(III) (n D 21). The low relative standard deviation, 2% (n D 11) and preconcentration factor as 75 for analytes were obtained.

Research paper thumbnail of A new synthesis, characterization and application chelating resin for determination of some trace metals in honey samples by FAAS

Food chemistry, Jan 15, 2016

In this study, we developed a simple and rapid solid phase extraction (SPE) method for the separa... more In this study, we developed a simple and rapid solid phase extraction (SPE) method for the separation/preconcentration and determination of some trace metals by flame atomic absorption spectrometry (FAAS). A new chelating resin, poly [2-(4-methoxyphenylamino)-2-oxoethyl methacrylate-co-divinylbenzene-co-2-acrylamido-2-methyl-1-propanesulfonic acid] (MPAEMA-co-DVB-co-AMPS), was synthesized and characterized. This chelating resin was used as a new adsorbent material for determination of Cd(II), Co(II), Cr(III), Cu(II), Fe(III), Mn(II), Pb(II), and Zn(II) ions. The parameters influential on the determination of this trace metals were examined. Under the optimum conditions, the detection limits (DL) of the method for trace metals were found to be (3s) in the range of 0.9-2.2μgL(-1) (n=21), the preconcentration factor was calculated as 200 and the relative standard deviation was obtained achieved as ⩽2% for n=11. The method was performed for the determination of trace metals in some hone...

Research paper thumbnail of Dispersive Liquid-Liquid Microextraction of Bismuth in Various Samples and Determination by Flame Atomic Absorption Spectrometry

Journal of Analytical Methods in Chemistry, 2016

A dispersive liquid-liquid microextraction method for the determination of bismuth in various sam... more A dispersive liquid-liquid microextraction method for the determination of bismuth in various samples by flame atomic absorption spectrometry is described. In this method, crystal violet was used as counter positive ion forBiCl4-complex ion, chloroform as extraction solvent, and ethanol as disperser solvent. The analytical parameters that may affect the extraction efficiency like acidity of sample, type and amount of extraction and disperser solvents, amount of ligand, and extraction time were studied in detail. The effect of interfering ions on the analyte recovery was also investigated. The calibration graph was linear in the range of 0.040–1.00 mg L−1with detection limit of 4.0 μg L−1(n=13). The precision as relative standard deviation was 3% (n=11, 0.20 mg L−1) and the enrichment factor was 74. The developed method was applied successfully for the determination of bismuth in various water, pharmaceutical, and cosmetic samples and the certified reference material (TMDA-64 lake wa...

Research paper thumbnail of Determination of some metal ions in various meat and baby food samples by atomic spectrometry

Food Chemistry, 2016

In this paper, we report a simple and rapid solid phase extraction system for the separation/prec... more In this paper, we report a simple and rapid solid phase extraction system for the separation/preconcentration and determination of Cd(II), Co(II), Cu(II), Fe(III), Cr(III), Pb(II), and Zn(II) ions by flame atomic absorption spectrometry (FAAS). This method is based upon the retention of metal ions on a column packed with poly[N-(3-methyl-1H-indole-1-yl)]-2-methacrylamide-co-2-acrylamido-2-methyl-1-pro pane sulphonic acid-co divinylbenzene] (MMAD) resin as a solid-phase extraction (SPE) sorbent at pH 8. At the optimized conditions, the limits of detection (3s/b) between 0.12 and 1.6 lg L À1 , preconcentration factor of 100, and the relative standard deviation of 61.8% were achieved (n = 10). The accuracy of the method was verified by analyzing certified reference materials (CRMs) and performing recovery experiments. The developed method was successfully applied to the various natural water, meat products and baby food samples. The recoveries of analyte ions were found in added real samples and CRMs from 95% to 102%.

Research paper thumbnail of Clay Catalyzed Reactions of Indole and its Methyl Derivatives with α, β-unsaturated Carbonyl Compounds

Croatica Chemica Acta, 2014

Electrophilic substituons reactions of indole and 1-methylindole with methyl propiolate in the pr... more Electrophilic substituons reactions of indole and 1-methylindole with methyl propiolate in the presence of K-10 montmorillonite were obtained the formation of the corresponding methyl 3,3bis(indolyl)propanoates. The reaction of 1,3-dimethylindole with methyl propiolate was given methyl 3,3bis(1,3-dimethyl-1H-indol-2-yl)propanoate, methyl 1,5-dimethyl-1H-benzo[b]azepine-3-carboxylate and methyl 3,3,3-tris(1,3-dimethyl-1H-indol-2-yl)propanoate. The reaction of 1,3-dimethylindole with 2cyclopentenone was yielded a typical addition product, similarly the reaction of indole and 1-methylindole with 2-cyclopentenone were concluded the expected addition products only.

Research paper thumbnail of A solid phase extraction procedure for the determination of Cd(II) and Pb(II) ions in food and water samples by flame atomic absorption spectrometry

Food chemistry, 2015

A relatively rapid, accurate and precise solid phase extraction method is presented for the deter... more A relatively rapid, accurate and precise solid phase extraction method is presented for the determination of cadmium(II) and lead(II) in various food and water samples. Quantitation is carried out by flame atomic absorption spectrometry (FAAS). The method is based on the retention of the trace metal ions on Dowex Marathon C, a strong acid cation exchange resin. Some important parameters affecting the analytical performance of the method such as pH, flow rate and volume of the sample solution; type, concentration, volume, flow rate of the eluent; and matrix effects on the retention of the metal ions were investigated. Common coexisting ions did not interfere on the separation and determination of the analytes. The detection limits (3σb) for Cd(II) and Pb(II) were found as 0.13 and 0.18μgL(-1), respectively, while the limit of quantification values (10σb) were computed as 0.43 and 0.60μgL(-1) for the same sequence of the analytes. The precision (as relative standard deviation was lowe...

Research paper thumbnail of An on-line separation and preconcentration system coupled with flame atomic absorption spectrometry for the determination of lead

Analytical Methods, 2013

ABSTRACT A simple on-line separation/preconcentration procedure is described for the determinatio... more ABSTRACT A simple on-line separation/preconcentration procedure is described for the determination of trace levels of Pb(II) by flame atomic absorption spectrometry (FAAS). A mini-column packed with Dowex Marathon C (DMC) ion-exchange resin was used for the on-line preconcentration of Pb(II) at pH 3.5. Pb(II) was sorbed on the resin, from which it could be eluted with 3 mol L−1 HCl and then introduced directly to the nebulizer–burner system of FAAS. The parameters influential on the determination of Pb(II) ions such as the pH of sample solution, eluent type, interfering ions and flow variables were studied. Under the optimum conditions, the calibration graph obtained was linear over the concentration range of 0.01–0.1 mg L−1. The detection limit of the method was 1.3 μg L−1 while precision was 1.1% (n = 15) at a 0.05 mg L−1 Pb(II) level. The accuracy of the method was proven using standard reference materials. The developed method has been applied successfully to the determination of lead in water and various environmental samples with satisfactory results.

Research paper thumbnail of A simple dispersive liquid–liquid microextraction method for determination of Ag(I) by flame atomic absorption spectrometry

Journal of Industrial and Engineering Chemistry, 2015

Silver is one of so-called noble metals used in many branches of industry and medicine. Compounds... more Silver is one of so-called noble metals used in many branches of industry and medicine. Compounds and products containing silver are present in alloys, batteries, photographic materials, coins, mirrors, cosmetics and ornament [1,2]. Silver is used as antiseptic agents and disinfectants [1]. Also, silver impregnated filters are used for drinking water preparation, and as well as in the processing of foods, drugs, and beverages [3-6]. Ag is present as impurity in copper, zinc, arsenic, antimony ores and another source, during operate of these sources of silver, environmental pollutions are come into being [7,8]. Therefore, due to industrial wastes, pollution of water sources exposured to the solute silver compounds for a long time were reported [9]. High concentrations or long time exposure to silver can cause significant health problems in living organisms [8]. The World Health Organization (WHO) reports that humans are able to tolerate concentrations up to 0.1 mg L À1 of Ag(I) in water without any health risk [1,2]. Thereby, due to the positive and negative

Research paper thumbnail of Novel PSt/PGMA/PIN ternary composite for SPE and analysis of some heavy metals in various cosmetics and food products by flame AAS

International Journal of Environmental Analytical Chemistry, Dec 15, 2020

In this investigation, a solid-phase extraction (SPE) process was improved for selective separati... more In this investigation, a solid-phase extraction (SPE) process was improved for selective separation of Cr, Cu, Fe, Mn, Pb and Zn ions on novel ternary composite. These heavy metals were analyzed by...

Research paper thumbnail of Clay Catalyzed Reactions of Indole and its Methyl Derivatives with α, β-unsaturated Carbonyl Compounds

Croatica Chemica Acta, 2014

Electrophilic substituons reactions of indole and 1-methylindole with methyl propiolate in the pr... more Electrophilic substituons reactions of indole and 1-methylindole with methyl propiolate in the presence of K-10 montmorillonite were obtained the formation of the corresponding methyl 3,3bis(indolyl)propanoates. The reaction of 1,3-dimethylindole with methyl propiolate was given methyl 3,3bis(1,3-dimethyl-1H-indol-2-yl)propanoate, methyl 1,5-dimethyl-1H-benzo[b]azepine-3-carboxylate and methyl 3,3,3-tris(1,3-dimethyl-1H-indol-2-yl)propanoate. The reaction of 1,3-dimethylindole with 2cyclopentenone was yielded a typical addition product, similarly the reaction of indole and 1-methylindole with 2-cyclopentenone were concluded the expected addition products only.

Research paper thumbnail of Synthesis, characterization and application of a new chelating resin for on-line separation, preconcentration and determination of Ag(I) by flame atomic absorption spectrometry

Talanta, 2013

A simple and reliable on-line separation/preconcentration procedure was developed for the determi... more A simple and reliable on-line separation/preconcentration procedure was developed for the determination of trace levels of Ag(I) by flame atomic absorption spectrometry. Poly[N-(3-methyl-1H-indol-1-yl)-2-methacrylamide-co-2-acrylamido-2-methyl-1-propane sulfonic acid-co-divinylbenzene] was synthesized and characterized as a new chelating resin for the first time. Ag(I) was sorbed on the chelating resin, from which it could be eluted with 3 mol L(-1) HCl and then introduced directly to the nebulizer-burner system for flame atomic absorption spectrometry. The parameters influential on the determination of Ag(I) ions such as the pH of the sample solution, amount of resin, eluent type, interfering ions and flow variables were studied. Under the optimum conditions, the calibration graph obtained was linear over the concentration range of 2-20 μg L(-1). The detection limit of the method (3σ) was 0.3 μg L(-1) while precision was 1.5% (n=25) at the level of 10 μg L(-1) Ag(I). The limit of quantification for the method, based on 20 σ, was 2.0 μg L(-1). The enrichment factor was found to be 65 while the optimized sample volume was 13.6 mL. The accuracy of the method was performed by analyzing certified reference materials. The developed method was applied successfully for the determination of silver in different water samples with satisfactory results.

Research paper thumbnail of Synthesis, characterization and application of a new chelating resin for solid phase extraction, preconcentration and determination of trace metals in some dairy samples by flame atomic absorption spectrometry

Food Chemistry, Nov 1, 2016

In this study, a simple and rapid solid phase extraction/preconcentration procedure was developed... more In this study, a simple and rapid solid phase extraction/preconcentration procedure was developed for determination of Cd(II), Co(II), Cr(III), Cu(II), Fe(III), Mn(II), Pb(II), and Zn(II) trace metals by flame atomic absorption spectrometry (FAAS). A new chelating resin, poly(N-cyclohexylacrylamide-co-divinylbenzene-co-2-acrylamido-2-methyl-1-propanesulfonic acid) (NCA-co-DVB-co-AMPS) (hereafter CDAP) was synthesized and characterized. The influences of the analytical parameters such as pH of the sample solution, type and concentration of eluent, flow rates of the sample and eluent, volume of the sample and eluent, amount of chelating resin, and interference of ions were examined. The limit of detection (LOD) of analytes were found (3s) to be in the range of 0.65-1.90μgL(-1). Preconcentration factor (PF) of 200 and the relative standard deviation (RSD) of ⩽2% were achieved (n=11). The developed method was applied for determination of analytes in some dairy samples and certified reference materials.

Research paper thumbnail of Indium triflate-catalyzed coupling of indoles with acyl phosphonates: synthesis of bis(indolyl)methane phosphonates

Tetrahedron, May 1, 2011

The coupling reaction of N-methylindole with alkyl and aryl phosphonate is described. The reactio... more The coupling reaction of N-methylindole with alkyl and aryl phosphonate is described. The reaction works in the presence of 10 mol % of indium triflate and furnished bis(indolyl)methane phosphonates in good yield and high selectivity.

Research paper thumbnail of A synthesized ternary polymer composite and its use for SPE of trace metals in Coffee, tea and legumes

Food Chemistry, Dec 1, 2021

A new synthesized ternary polymer composite, polystyrene/polyacrylonitrile/polyindole (PSt/PAN/PI... more A new synthesized ternary polymer composite, polystyrene/polyacrylonitrile/polyindole (PSt/PAN/PIN), was used as an adsorbent. The structure of synthesized composite was supported by FTIR, BET, X-RD, TGA, SEM and AFM technique. A SPE method with synthesized composite was developed for the preconcentration of chromium, copper, iron, manganese, lead and zinc ions. The adsorption capacity were found in the range of 37.4-56.7 mg g-1. Under the best conditions, the preconcentration factor of method was found as 100. Relative standard deviation was found at ≤ 3.3% (n = 11). The detection limits of analytes were obtained as: 0.9 μg L-1 for Cr(III), 1.2 μg L-1 for Cu(II), 2.0 μg L-1 for Fe(III), 1.4 μg L-1 for Mn(II), 0.9 μg L-1 for Pb(II) and 2.0 µg L-1 for Zn(II). Firstly, this SPE method was applied to certified reference material, and than coffee, tea, legumes. The trace metals was analyzed by flame atomic absorption spectrometry.

Research paper thumbnail of Novel PSt/PGMA/PIN ternary composite for SPE and analysis of some heavy metals in various cosmetics and food products by flame AAS

International Journal of Environmental Analytical Chemistry

In this investigation, a solid-phase extraction (SPE) process was improved for selective separati... more In this investigation, a solid-phase extraction (SPE) process was improved for selective separation of Cr, Cu, Fe, Mn, Pb and Zn ions on novel ternary composite. These heavy metals were analyzed by...

Research paper thumbnail of Determination of some trace metals with a new synthesized polymer resin by FAAS in various tea and herbal plants samples

Journal of Macromolecular Science, Part A, 2018

In this work, a new polymer resin with a functional groups capable of holding trace metals has be... more In this work, a new polymer resin with a functional groups capable of holding trace metals has been synthesized. The structure of polymer resin has been examined by BET-N 2 method analyzer, IR spectrometer, scanning electron microscope (SEM) and elemental microanalyser. The synthesized polymer resin was used for the simultaneous separation and preconcentration of the trace metals from various tea and herbal plants samples. After extraction process, flame atomic absorption spectrometry (FAAS) was used to determine the trace metals. The analytical parameters and solid phase extraction (SPE) performance such as pH, sample volume, flow rates of sample, flow rates of eluent, concentration, volume and type of eluent and effect of interference ions, were investigated. The limits of detection (DL) of the SPE procedure for trace metals, were calculated to be (3s) in the range of 0.9¡4.0 mg L ¡1 (n D 21) and the factors of preconcentration (PF) were obtained at 200 for Cd, Co, Cu, Fe, Ni and Zn, and at 50 for Cr, Mn and Pb ions and the relative standard deviation (RSD) at 2% (n D 11).

Research paper thumbnail of SPE and determination by FAAS of heavy metals using a new synthesized polymer resin in various water and dried vegetables samples

Journal of Macromolecular Science, Part A, 2018

Firstly, poly[phenyl thiadiazole methacrylamide-co-divinylbenzene-co-2-acrylamido-2-methylpropane... more Firstly, poly[phenyl thiadiazole methacrylamide-co-divinylbenzene-co-2-acrylamido-2-methylpropane sulfonic acid] (PTMAAm-co-DVB-co-AMPS), a new polymer resin was synthesized. This polymer resin was characterized by elemental analyzer, X-ray diffractometer, scanning electron microscope (SEM) and IR spectrometer. The glass column packed with the synthesized polymer resin was used for solid phase extraction (SPE). At the same time, the analytes were separated and preconcentrated from various water, dried vegetables samples and standard reference material (CRM) with SPE and determined by flame atomic absorption spectrometer (FAAS). The experimental conditions of this method such as pH, flow rates of sample, flow rates of eluent, type / concentration / volume of eluent, sample volume and matrix ions were examined. The limits of detection (mg L ¡1) were calculated (3s) 0.9 for Mn(II), 1.4 for Cd(II), Co(II) and Zn(II), 1.5 for Cr(III), 2.2. for Cu(II), 1.9 for Pb(II),1.5 for Ni(II) and 1.9 for Fe(III) (n D 21). The low relative standard deviation, 2% (n D 11) and preconcentration factor as 75 for analytes were obtained.

Research paper thumbnail of A new synthesis, characterization and application chelating resin for determination of some trace metals in honey samples by FAAS

Food chemistry, Jan 15, 2016

In this study, we developed a simple and rapid solid phase extraction (SPE) method for the separa... more In this study, we developed a simple and rapid solid phase extraction (SPE) method for the separation/preconcentration and determination of some trace metals by flame atomic absorption spectrometry (FAAS). A new chelating resin, poly [2-(4-methoxyphenylamino)-2-oxoethyl methacrylate-co-divinylbenzene-co-2-acrylamido-2-methyl-1-propanesulfonic acid] (MPAEMA-co-DVB-co-AMPS), was synthesized and characterized. This chelating resin was used as a new adsorbent material for determination of Cd(II), Co(II), Cr(III), Cu(II), Fe(III), Mn(II), Pb(II), and Zn(II) ions. The parameters influential on the determination of this trace metals were examined. Under the optimum conditions, the detection limits (DL) of the method for trace metals were found to be (3s) in the range of 0.9-2.2μgL(-1) (n=21), the preconcentration factor was calculated as 200 and the relative standard deviation was obtained achieved as ⩽2% for n=11. The method was performed for the determination of trace metals in some hone...

Research paper thumbnail of Dispersive Liquid-Liquid Microextraction of Bismuth in Various Samples and Determination by Flame Atomic Absorption Spectrometry

Journal of Analytical Methods in Chemistry, 2016

A dispersive liquid-liquid microextraction method for the determination of bismuth in various sam... more A dispersive liquid-liquid microextraction method for the determination of bismuth in various samples by flame atomic absorption spectrometry is described. In this method, crystal violet was used as counter positive ion forBiCl4-complex ion, chloroform as extraction solvent, and ethanol as disperser solvent. The analytical parameters that may affect the extraction efficiency like acidity of sample, type and amount of extraction and disperser solvents, amount of ligand, and extraction time were studied in detail. The effect of interfering ions on the analyte recovery was also investigated. The calibration graph was linear in the range of 0.040–1.00 mg L−1with detection limit of 4.0 μg L−1(n=13). The precision as relative standard deviation was 3% (n=11, 0.20 mg L−1) and the enrichment factor was 74. The developed method was applied successfully for the determination of bismuth in various water, pharmaceutical, and cosmetic samples and the certified reference material (TMDA-64 lake wa...

Research paper thumbnail of Determination of some metal ions in various meat and baby food samples by atomic spectrometry

Food Chemistry, 2016

In this paper, we report a simple and rapid solid phase extraction system for the separation/prec... more In this paper, we report a simple and rapid solid phase extraction system for the separation/preconcentration and determination of Cd(II), Co(II), Cu(II), Fe(III), Cr(III), Pb(II), and Zn(II) ions by flame atomic absorption spectrometry (FAAS). This method is based upon the retention of metal ions on a column packed with poly[N-(3-methyl-1H-indole-1-yl)]-2-methacrylamide-co-2-acrylamido-2-methyl-1-pro pane sulphonic acid-co divinylbenzene] (MMAD) resin as a solid-phase extraction (SPE) sorbent at pH 8. At the optimized conditions, the limits of detection (3s/b) between 0.12 and 1.6 lg L À1 , preconcentration factor of 100, and the relative standard deviation of 61.8% were achieved (n = 10). The accuracy of the method was verified by analyzing certified reference materials (CRMs) and performing recovery experiments. The developed method was successfully applied to the various natural water, meat products and baby food samples. The recoveries of analyte ions were found in added real samples and CRMs from 95% to 102%.

Research paper thumbnail of Clay Catalyzed Reactions of Indole and its Methyl Derivatives with α, β-unsaturated Carbonyl Compounds

Croatica Chemica Acta, 2014

Electrophilic substituons reactions of indole and 1-methylindole with methyl propiolate in the pr... more Electrophilic substituons reactions of indole and 1-methylindole with methyl propiolate in the presence of K-10 montmorillonite were obtained the formation of the corresponding methyl 3,3bis(indolyl)propanoates. The reaction of 1,3-dimethylindole with methyl propiolate was given methyl 3,3bis(1,3-dimethyl-1H-indol-2-yl)propanoate, methyl 1,5-dimethyl-1H-benzo[b]azepine-3-carboxylate and methyl 3,3,3-tris(1,3-dimethyl-1H-indol-2-yl)propanoate. The reaction of 1,3-dimethylindole with 2cyclopentenone was yielded a typical addition product, similarly the reaction of indole and 1-methylindole with 2-cyclopentenone were concluded the expected addition products only.

Research paper thumbnail of A solid phase extraction procedure for the determination of Cd(II) and Pb(II) ions in food and water samples by flame atomic absorption spectrometry

Food chemistry, 2015

A relatively rapid, accurate and precise solid phase extraction method is presented for the deter... more A relatively rapid, accurate and precise solid phase extraction method is presented for the determination of cadmium(II) and lead(II) in various food and water samples. Quantitation is carried out by flame atomic absorption spectrometry (FAAS). The method is based on the retention of the trace metal ions on Dowex Marathon C, a strong acid cation exchange resin. Some important parameters affecting the analytical performance of the method such as pH, flow rate and volume of the sample solution; type, concentration, volume, flow rate of the eluent; and matrix effects on the retention of the metal ions were investigated. Common coexisting ions did not interfere on the separation and determination of the analytes. The detection limits (3σb) for Cd(II) and Pb(II) were found as 0.13 and 0.18μgL(-1), respectively, while the limit of quantification values (10σb) were computed as 0.43 and 0.60μgL(-1) for the same sequence of the analytes. The precision (as relative standard deviation was lowe...

Research paper thumbnail of An on-line separation and preconcentration system coupled with flame atomic absorption spectrometry for the determination of lead

Analytical Methods, 2013

ABSTRACT A simple on-line separation/preconcentration procedure is described for the determinatio... more ABSTRACT A simple on-line separation/preconcentration procedure is described for the determination of trace levels of Pb(II) by flame atomic absorption spectrometry (FAAS). A mini-column packed with Dowex Marathon C (DMC) ion-exchange resin was used for the on-line preconcentration of Pb(II) at pH 3.5. Pb(II) was sorbed on the resin, from which it could be eluted with 3 mol L−1 HCl and then introduced directly to the nebulizer–burner system of FAAS. The parameters influential on the determination of Pb(II) ions such as the pH of sample solution, eluent type, interfering ions and flow variables were studied. Under the optimum conditions, the calibration graph obtained was linear over the concentration range of 0.01–0.1 mg L−1. The detection limit of the method was 1.3 μg L−1 while precision was 1.1% (n = 15) at a 0.05 mg L−1 Pb(II) level. The accuracy of the method was proven using standard reference materials. The developed method has been applied successfully to the determination of lead in water and various environmental samples with satisfactory results.

Research paper thumbnail of A simple dispersive liquid–liquid microextraction method for determination of Ag(I) by flame atomic absorption spectrometry

Journal of Industrial and Engineering Chemistry, 2015

Silver is one of so-called noble metals used in many branches of industry and medicine. Compounds... more Silver is one of so-called noble metals used in many branches of industry and medicine. Compounds and products containing silver are present in alloys, batteries, photographic materials, coins, mirrors, cosmetics and ornament [1,2]. Silver is used as antiseptic agents and disinfectants [1]. Also, silver impregnated filters are used for drinking water preparation, and as well as in the processing of foods, drugs, and beverages [3-6]. Ag is present as impurity in copper, zinc, arsenic, antimony ores and another source, during operate of these sources of silver, environmental pollutions are come into being [7,8]. Therefore, due to industrial wastes, pollution of water sources exposured to the solute silver compounds for a long time were reported [9]. High concentrations or long time exposure to silver can cause significant health problems in living organisms [8]. The World Health Organization (WHO) reports that humans are able to tolerate concentrations up to 0.1 mg L À1 of Ag(I) in water without any health risk [1,2]. Thereby, due to the positive and negative