A Novel Iron(III) Selective Membrane Electrode Containing a Tripodal Polycatacholamine as Sensor (original) (raw)
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Current Analytical Chemistry, 2014
A novel polyvinyl chloride (PVC) membrane sensor that is highly selective to Fe 3+ ions was prepared by using 5-chloro-3-[4-(trifluoromethoxy)phenylimino]indolin-2-one (CFMEPI) ionophore. The sensor exhibits a Nernstian response for Fe 3+ ions over a wide concentration range (1.0 ×10 -2 −1.0×10 -6 M) with a slope of 46.7±0.5 mV per decade. The sensor has a response time of 20s and can be used for at least 3 months without any measurable divergence in potential. It was concluded that the sensor response was pH independent in the range of 4.0-8.61. The sensor has some advantages such as short analysis time, particularly high selectivity towards iron (III). The sensor was used successfully for direct determination of Fe 3+ in several synthetic and real samples with satisfactory results.
Liquid membrane potentiometric sensor for determination of Fe3+ ion
Journal of Analytical Chemistry, 2014
Solution studies showed a selective interaction between the new synthesized ionophore, 2 [(thiophen 2 yl)methyleneamino]isoindoline 1,3 dione (TMID) and Fe(III) ion. Therefore, TMID was used as an iron selective ion carrier in a plasticized liquid membrane sensor. The linear response range of the proposed electrode was 1.0 × 10-6-1.0 × 10-2 M. The Nernstian slope of 20.1 ± 0.3 mV/decade, and a detec tion limit of 5 × 10-7 M was obtained. The sensor could be used in the pH range of 2.3-4.8, and the response time was about 10 s. The lifetime of the electrode was at least 7 weeks. The sensor accuracy was investigated in two ways: (i) with the potentiometric titration of a Fe 3+ solution with EDTA and (ii) with Fe(III) monitor ing in some cationic mixtures. Finally, the newly fabricated electrode was effectively applied as an indicator electrode for the direct Fe 3+ determination in real samples.
2009
A new Fe 3+ ion-selective membrane electrode based on 6-ketomethyl phenanthridine (6-KMPT) and 1-(4dimethyl aminophenyl)-2-(5H-phenanthridine-6-ylidene)-ethanone, which were incorporated in a plasticized polyvinyl chloride (PVC) membrane, is described. The optimized membrane demonstrated a linear dynamic range of 5.2 × 10 −6-1.0 × 10 −2 M, with a near Nernstian slope of 19.5 ± 1.5 mV per decade and a detection limit of 1.2 × 10 −6 M. The electrode showed high selectivity for Fe 3+ ions in comparison to other metal ions. The effect of membrane composition on the potential response of the electrode was studied. The best performance was observed for the membrane comprised of electroactive material (6-KMPT), dioctyl phthalate (DOP) as plasticizer, and PVC in the optimum ratio of 5:67:28% w/w. The pH working range of the sensor was 1.2-3.0. The proposed Fe 3+ sensor was successfully used for determining the presence of iron in pharmaceuticals and the results were in good agreement with the value obtained using the atomic absorption spectroscopic method.
Journal of The Chilean Chemical Society, 2009
A new poly(vinyl chloride) membrane electrode that is highly selective to Fe 3+ ions was prepared by using 4,4'-Dimethoxybenzil bisthiosemicarbazone (DBTS) as a suitable neutral carrier. Membrane incorporating 4,4'-Dimethoxybenzil bisthiosemicarbazone (DBTS), as ionophore with composition DBTS:NaTPB:NB:PVC in the ratio 2:2:64:32 (w/w) exhibits the best result for potentiometric sensing of Fe 3+ ions. The electrode exhibited a near-Nernstian response to Fe 3+ in the concentration range of 1.0 × 10 −6 to 1.0×10 −2 M with a slope of 19.4 ± 0.5 mV per decade. The proposed sensor can be used over a period of 2 months. The lower limit of detection was 3.6×10 −7 M. This electrode showed high selectivity with respect to alkaline, alkaline earth, and heavy metal ions and could be used over a pH range of 1.8-5.0. It has been successfully used as an indicator electrode in potentiometric titration of Fe 3+ against EDTA as well as for the determination of Fe 3+ in water sample solutions (tap and mineral water samples).
PVC-membrane potentiometric sensors based on a recently synthesized Schiff base for Fe(III) ion
Bulletin of the Chemical Society of Ethiopia, 2012
A potentiometric iron sensor based on the use 3-(2-diethylamino-ethylimino)-1,3-dihydro-indol-2-one (DEDIO) as an ionophore in poly(vinyl chloride) (PVC) matrix, is reported. The plasticized membrane sensor exhibits a Nernstian response for Fe(III) ions over a wide concentration range (2.0 × 10-6-5.0 × 10-2 M) with a super Nernstian slope of 26(±1) mV per decade. It has a fast response time of <12 s and can be used for ten weeks without any considerable divergences in its potentials .the electrode can be used in the pH range 4.5-8.0. The proposed sensor shows fairly good discriminating ability towards Fe(III) ion in comparison with a large number of alkali, alkaline earth, transition and heavy metal ions. The sensor was used as indicator electrode in potentiometric titration of Fe(III) ions vs. EDTA.
2011
The construction, performance characteristics and application of a novel iron(III) membrane sensor based on a new S-methyl N-(methylcarbamoyloxy) thioacetimidate are reported in this paper. The designed sensor exhibited a wide linear response with a slope of 21.2 mV per decade over the concentration range of 9.1x10 -6 -1.0x10 -1 M. The potentiometric response is independent on the pH of the solution in the range of 3.2-4.8. The electrode shows a response time of 20 s. The proposed electrode can be used for at least two months without any considerable divergence in potentials. It exhibits very good selectivity relative to a wide variety of alkali, alkaline earth, transition and heavy metal ions. The developed sensor was used for the quantitative determination of Fe(III) in tap and mineral water samples. The electrode assembly was also used as an indicator electrode in the potentiometric titration of Fe 3+ with EDTA.
New Modified Fe(III)-Selective Solid Membrane Electrode
Reviews in Analytical Chemistry, 2008
In this study, a Fe(III)-selective solid state membrane electrode based on AgFeS 2-FeS x (x=2-3) mixture was developed. This electrode exhibited a linear Nernstian response over the range 10" 2-10' 5 Μ of iron(III) with a slope of 18.7 ± 0.8 mV per p[Fe]. The effects of the pH and the lifetime of the electrode were investigated. The selectivity coefficients for some common cations were calculated by the mixed-solution method. The preparation procedure of the electrode is easy and inexpensive. Moreover, the proposed electrode was applied for the determination of iron in standard reference materials.
New Fe(II) Ion-selective electrode based On N-Phenylaza-15-Crown-5 as neutral carrier in PVC matrix
Desalination, 2009
A new polyvinyl chloride (PVC) membrane electrode that is highly selective to Fe(II) ions was prepared using N-phenylaza-15-crown-5 (NPA15C5) as a suitable neutral carrier. The sensor exhibits a Nernstian response for Fe(II) ions over a wide concentration range (1.0 Â 10 À2 to 1.0 Â 10 À6 M) with a slope of 29.2 ± 0.6 mV per decade. It has a response time of <15 s and can be used for at least 2 months without any measurable divergence in potential. The proposed sensor shows a fairly good discriminating ability towards Fe 2+ ion in comparison with some hard and soft metal ions. The isothermal temperature coefficient of this electrode amounted to 0.0017 V/8C. The stability constant (log K s ) of the Fe(II)-NPA15C5 complex was determined at 258C by potentiometric titration in mixed aqueous solution. The results show that this electrode can be used in ethanol and dioxane media up to 20% and 5% (v/v) concentration, respectively, without interference. The electrode was used for direct determination of Fe 2+ in the ferrous sulfate syrup.
A New Fe (III)-Selective Membrane Electrode Based on Fe (II) Phthalocyanine
Journal of Electrochemical Science and Technology
A new miniaturized all solid-state contact Fe (III)-selective PVC membrane electrode based on Fe (II) phthalocyanine as a neutral carrier was described. The effects of the membrane composition and foreign ions on the electrode performance was investigated. The best performance was obtained with a membrane containing 32% poly (vinyl chloride), 64% dioctylsebacate, 3% Fe (II) phthalocyanine, and 1% potassium tetrakis (p-chlorophenyl) borate. The electrode showed near Nernstian response of 26.04 ± 0.95 mV/decade over the wide linear concentration range 1.0 × 10-6 to 1.0 × 10-1 M, and a very low limit of detection 1.8±0.5 × 10-7 M. The potentiometric response of the developed electrode was independent at pH 3.5-5.7. The lifetime of the electrode was approximately 3 months and the response time was very short (< 7 s). It exhibited excellent selectivity towards Fe (III) over various cations. The miniaturized all solid-state contact Fe (III)-selective membrane electrode was successfully applied as an indicator electrode for the potentiometric titration of 1.0 × 10-3 M Fe (III) ions with a 1.0 × 10-2 M EDTA and the direct determination of Fe (III) ions in real water samples.
DEVELOPMENT OF Fe(II)-SELECTIVE SOLID MEMBRANE ELECTRODE BASED ON 1,10-PHENANTHROLINE LIGAND Suyanta
2016
The development of ion selective electrode based on 1,10-phenanthroline has been constructed for determination of Fe(II). The electrode was fabricated using 1,10-phenanthroline, KTCpB, DBP, PVC (6.73% : 3.33% : 60% : 30%) and THF. The Nernst factor, concentration range, detection limit, response time and selectivity of the membrane electrode are described. The membrane electrode exhibited good response for Fe(II). in a wide concentration range from 1 × 10 -6 M to 1 × 10 -2 M with a slope of 30.37 mV/decade of Fe(II) concentration. The electrode has a detection limit of 7.902 × 10 -7 M with response time 15 second. Furthermore, the electrode generated constant potentials in the pH range of 2.5-8.0 without interference from Ca(II) and Mg(II) ions. The developed electrode was used for quantification of Fe(II) in underground water samples and the results were in good agreement with those obtained with an UV-Vis spectrophotometric method.