Dr. Bohari Yusuf, M.Si - Academia.edu (original) (raw)
Papers by Dr. Bohari Yusuf, M.Si
Proceedings the 7th National Radar Seminar & the 2nd International Conference on Radar, Antenna, Microwave, Electronics and Telecommunications (ICRAMET) 2013, Mar 1, 2013
JURNAL KIMIA MULAWARMAN
Analisa chlorampenicol pada udang windu secara spektrofotometri berbasis reaksi diazotasi telah d... more Analisa chlorampenicol pada udang windu secara spektrofotometri berbasis reaksi diazotasi telah dilakukan. sulfanilamid digunakan sebagai sumber garam diazo yang akan dikopling dengan chlorampenicol. Pada penelitian ini dilakukan beberapa optimasi seperti optimasi suhu, volume HCl, volume NaNO2, volume sulfanilamid dan waktu kopling. Senyawa yang dihasilkan yaitu senyawa azo sulfanilamid-chlorampenicol berwarna kuning jernih yang akan diukur dengan spektrofotometri visible. Dilakukan aplikasi pada sampel udang windu yang telah dipreparasi. Berdasarkan hasil pengujian chlorampenicol pada sampel udang windu, diperoleh nilai koefisien variasi pada konsentrasi chlorampenicol 20 µg/mL, 40 µg/mL dan 70 µg/mL berturut turut sebesar 4,0269 %, 1,9509 % dan 4,2771 %. dengan rata rata sebesar 3,4183 % lebih kecil 1/8,5 dibandingkan CV Horwitz sebesar 9,2777%. Nilai akurasi pada rentang 99,7143% sampai 100,8730%. Nilai limit deteksi sebesar 6,2411 mg/mL dan nilai limit kuantisasi sebesar 20,803...
JURNAL KIMIA MULAWARMAN
The study about the comparison of analytical performance of the determination of Pb metal ions us... more The study about the comparison of analytical performance of the determination of Pb metal ions using Atomic Absorption Spectrophotometer in various laboratories in samarinda has been conducted. The validated methods are linearity, detection limits, quantity and precision limits. The results showed, a standardized regression test obtained by laboratory A, a value of R2 ≥ 0.4103, laboratory B a value of R2 ≥ 0.983 and laboratory C, a value of R2 ≥ 0.000. The detection limit found at laboratory A was 0.6728 µg/L, laboratory B was 0.1989 µg/L and laboratory C was 0.0001 µg/L. The quantization limit obtained by laboratory A was 0.6817 µg/L, laboratory B was 0.6063 µg/L and laboratory C was 0.0001 µg/L. The precision test of laboratory A was 7.2208, laboratory B was 5.4557 and laboratory C was 0,000. The result of determining Pb of gas station soil samples in laboratory A is 0.737 µg/L and laboratory B is 0.391 µg/L, so that means they have exceeded the quality standards set...
Eurasian Journal of Biosciences, Sep 1, 2020
Molecular and Cellular Bimedical Sciences, Jul 1, 2019
PROSIDING SEMINAR KIMIA, Oct 2, 2021
Development of chlorampenicol analytical method UV-VIS spectrophotometry based on the diazotation... more Development of chlorampenicol analytical method UV-VIS spectrophotometry based on the diazotation reaction at cold temperatures has been carried out. In this study, a coupling reaction was carried out between diazonium salt sourced from sulfanilamide and chlorampenicol, diazonium salt was made by reacting sodium nitrite and HCl with sulfanilamide. In the manufacturing process and the coupling reaction between diazonium salt and chlorampenicol was carried out at cold temperatures and the resulting compound was stable at ± 10°C. The compound formed was an azo sulfanilamide-CAP compound and was measured by UV-Vis spectrophotometry at a wavelength of 400,941 nm.
Proceeding The International Symposium of Human Development and Sustainable Utilization of Natural Resources in Asian Countries and The 6th Korea-Thailand-Indonesia Joint Symposium on Biomas Utilization and Renewable Energy, Jul 1, 2012
Jurnal Sains Dasar UNY, Nov 1, 2014
PROSIDING SEMINAR KIMIA, Oct 3, 2021
Synthesis of silver nanoparticles (AgNPs) was made by chemical reduction method. The reaction bet... more Synthesis of silver nanoparticles (AgNPs) was made by chemical reduction method. The reaction between silver nitrate (AgNO 3) with trisodium citrate will form silver nanoparticles (AgNPs) which are characterized by a significant color change from clear to yellow. The resulting silver nanoparticles (AgNPs) were characterized using a UV-Vis Spectrophotometer in the optimization stage in order to obtain AgNPs that were already in optimum condition and produced a stable yellow color. The results of the UV-Vis Spectrophotometer characterization showed that the most optimum nanoparticles were found at a concentration of 1 mM using a heating temperature of 85 0 C with the addition of 7 mL of trisodium citrate in 13 minutes. The use of trisodium citrate in the synthesis of silver nanoparticles (AgNPs) acts as a reducing agent and stabilizer. The stability test of silver nanoparticles (AgNPs) was carried out for 15 days and produced a stable color on the 7 th day which was indicated by the color of the yellow solution.
Proceeding The International Symposium of Human Development and Sustainable Utilization of Natural Resources in Asian Countries and The 6th Korea-Thailand-Indonesia Joint Symposium on Biomas Utilization and Renewable Energy, Jul 1, 2012
Research on the determination of Pb 2+ ions (lead)in hair repair shop employee in the city of Sam... more Research on the determination of Pb 2+ ions (lead)in hair repair shop employee in the city of Samarinda. This study aims to determine whether there is a relationship between the concentration of lead ions in the workshop employees hair against old age and work. Measurements of Pb 2+ ions (lead) was performed using Atomic Absorption Spectrophotometer (AAS). Hair cut into small pieces, washed, crushed or burned into ashes and homogenized and analyzed by Atomic Absorption Spectrophotometer (AAS). The results obtained from the measurement and analysis of Pb 2+ ions concentration in hair repair shop employee is 0.2193 ppm and 0.3665 ppm lowest to highest. At the workshop employees there is a relationship between age and levels of Pb 2+ ions (lead) in the hair, while there was no correlation between long working white Pb, it's based on a statistical analysis of the results of the determination coefficient and linear regression. A. PENDAHULUAN Pencemaran logam terhadap lingkungan merup...
![Research paper thumbnail of Pembuatan selulosa dari kulit singkong termodifikasi 2-merkaptobenzotiazol untuk pengendalian pencemaran logam kadmium (II) [Cellulose production from modified cassava skin 2-mercaptobenzotiazole for controlling cadmium (II) metal pollution]](https://attachments.academia-assets.com/95799274/thumbnails/1.jpg)
](The research study of cadmium (II) metal ion adsorption in a solution by 2-mercaptobenzotiazole m... more The research study of cadmium (II) metal ion adsorption in a solution by 2-mercaptobenzotiazole modified cellulose and unmodified cellulose had been done. The aims of this research are to know the ability of 2-mercaptobenzotiazole modified and unmodified celluloses for adsorbing cadmium (II) metal ion with the composition of modification. The modification processes of cellulose were done by the composition variation between cellulose and MBT of 1:1, 1:2, and 1:3. The adsorption process of metal ions by 2-mercaptobenzotiazole modified cellulose were done by shaking at pH 3, 4, 5, 6, 7, 8, and 9 with the effect of metal ions concentration of 0.05; 0.1; 0,15; 0,2, and 0,25 mg/L. The analysis of functional groups of cellulose-MBT and cellulose unmodified was using FTIR Spectrophotometer. The analysis of cadmium (II) concentration metal ions as cadmium metals were done by atomic absorption spectrophotometer (AAS). The result of this research showed that on the functional groups which der...
Research Journal of Pharmacy and Technology, 2021
The development of the separation method has an essential role in developing science and technolo... more The development of the separation method has an essential role in developing science and technology for the separation and purification of an element or compound from other mixtures based on differences in physical and chemical properties. This research is more focused on the selection parameters of polystyrene-based resin production using diethylene triamine penta-acetate (DTPA) light, which used as a prototype for improved scale production. The Plackett-Burman design was used to select variables that have significant influence in Methylaminopolystyrene-Diethylenetriaminepentaacetate (MAP-DTPA) resin synthesis. Eleven variables such as mol ratio of Methylamino Polystyrene and diethylene triamine penta-acetate ligands, solvent volume, reaction time, stirring rate, reaction temperature, total volume, reaction pH, incubation time, ammonia concentration, and the addition of methanol were carried out for the selection of parameters or variables in the process of MAP-DTPA resin synthesis...
The modification of resin Ca Alginate with rice straw ash as a column filler material for preconc... more The modification of resin Ca Alginate with rice straw ash as a column filler material for preconcentration step of Mn(II) ion. Has been done Preconcentration method was used by off-line method, water samples were passed through the column and eluted with 0.1 M H2SO4. The eluate was taken and detected by using Spectrophotometer UV Visible. Optimum composition of modified resin Rice straw ash Ca Alginat were at 1% Na Alginate, 0.1 M CaCl2, and 0.5 g rice straw ash. The result of research shown the optimum condition of retention capacity ion Mn(II) was 0.08211 mg Mn / gr resin. The best sorption at pH 2, and optimum condition of eluent concentration 0.1 M H2SO4, sample volume 12 mL and eluent volume was 5 mL. The analytical performance of this method was good for determination of ion Mn(II) that could be evaluated by limit of detection about 0.7727 mg/L with the reproducibility level shown by the precentage of the coefficient variance was 1.179 %. This method could be applicated to det...
The analysis of changes in levels of copper (Cu) on the addition of silver ions (Ag) with electro... more The analysis of changes in levels of copper (Cu) on the addition of silver ions (Ag) with electrocoagulation method has been researched by using Atomic Absorption Spectrophotometer (AAS) as an instrument for the determination of levels. The addition of ionic silver (Ag) in a solution of copper (Cu) using varying concentrations of silver (Ag) 4, 6, 8, 10 and 12 ppm. The results showed that the effect of the addition of ionic silver (Ag) 4,6, 8, 10 and 12 resulted in changes in the levels of copper (Cu) are deposited successively in the ppm concentration is 9.375; 9.324; 9.272; 9.168; 9.142 and 9.116. Metalcontentof silver(Ag) in a medium containing copper (Cu) with a variety of metallic silver( Ag) differentat 4, 6, 8, 10 and 12ppm after the electrocoagulation metal contentof silver(Ag) depositedin the amount3.99; 5.99; 7.96; 9.91 and 11.88ppm. Keywords : Electrocoagulation, Copper(Cu), Silver(Ag)
Potential of Ciplukan plant as natural antioxidants, the aim of this research is to determine the... more Potential of Ciplukan plant as natural antioxidants, the aim of this research is to determine the antioxidant potential of Ciplukan plant. First step is to know the active compound of the plant. Alkaloid and saponin are present at ciplukan leaves, stem and fruit, meanwhile steroid is present at leaves and stem. Moreover, flavonoid and triterpenoid is only present at stem and fruit, respectively. Phytochemical test are employed to dermine the active compound in the leaves, stem and fruit of ciplukan. Brine shimp lethality test are conducted to determine toxicity of the extract.The LC 50 from the leaves extract is 962.054 ppm, stem extract is 753.558 ppm and at the fruit is 1.004,73 ppm . Antioxidant activity measurement conducted by reacting the sample with 1,1-difenil-2-pikrilhidrazil radical and measures the absorbance at wavelength 517 nm. Vitamin C is use as positive control. The inhibition concentration 50 vitamin C is 34.91 ppm. Meanwhile, the Inhibition concentration 50 of the...
JURNAL KIMIA MULAWARMAN, 2018
The reduction of copper concentration in the electroplating industry wastewater by electrodeposit... more The reduction of copper concentration in the electroplating industry wastewater by electrodeposition method by means of Atomic Absorption Spectrophotometer (AAS). The result of research showed that degradation and is big of elimination percent of copper metal have with the effect of time contact and voltage at optimum hence in getting results of final concentration of iron (Fe) successive plate 4,02 ppm and 2,84 ppm of concentration early 35,86 ppm and elimination percent of exclusion at optimum parameter in getting result successive 88,403 % and 92,069 %. While the results of the final concentration of Aluminium (Al) successive plate 2,38 ppm dan 2,22 ppm of concentration early 35,86 ppm and elimination percent of exclusion at optimum parameter in getting result successive 93,363 % dan 93,814%.
Proceedings the 7th National Radar Seminar & the 2nd International Conference on Radar, Antenna, Microwave, Electronics and Telecommunications (ICRAMET) 2013, Mar 1, 2013
JURNAL KIMIA MULAWARMAN
Analisa chlorampenicol pada udang windu secara spektrofotometri berbasis reaksi diazotasi telah d... more Analisa chlorampenicol pada udang windu secara spektrofotometri berbasis reaksi diazotasi telah dilakukan. sulfanilamid digunakan sebagai sumber garam diazo yang akan dikopling dengan chlorampenicol. Pada penelitian ini dilakukan beberapa optimasi seperti optimasi suhu, volume HCl, volume NaNO2, volume sulfanilamid dan waktu kopling. Senyawa yang dihasilkan yaitu senyawa azo sulfanilamid-chlorampenicol berwarna kuning jernih yang akan diukur dengan spektrofotometri visible. Dilakukan aplikasi pada sampel udang windu yang telah dipreparasi. Berdasarkan hasil pengujian chlorampenicol pada sampel udang windu, diperoleh nilai koefisien variasi pada konsentrasi chlorampenicol 20 µg/mL, 40 µg/mL dan 70 µg/mL berturut turut sebesar 4,0269 %, 1,9509 % dan 4,2771 %. dengan rata rata sebesar 3,4183 % lebih kecil 1/8,5 dibandingkan CV Horwitz sebesar 9,2777%. Nilai akurasi pada rentang 99,7143% sampai 100,8730%. Nilai limit deteksi sebesar 6,2411 mg/mL dan nilai limit kuantisasi sebesar 20,803...
JURNAL KIMIA MULAWARMAN
The study about the comparison of analytical performance of the determination of Pb metal ions us... more The study about the comparison of analytical performance of the determination of Pb metal ions using Atomic Absorption Spectrophotometer in various laboratories in samarinda has been conducted. The validated methods are linearity, detection limits, quantity and precision limits. The results showed, a standardized regression test obtained by laboratory A, a value of R2 ≥ 0.4103, laboratory B a value of R2 ≥ 0.983 and laboratory C, a value of R2 ≥ 0.000. The detection limit found at laboratory A was 0.6728 µg/L, laboratory B was 0.1989 µg/L and laboratory C was 0.0001 µg/L. The quantization limit obtained by laboratory A was 0.6817 µg/L, laboratory B was 0.6063 µg/L and laboratory C was 0.0001 µg/L. The precision test of laboratory A was 7.2208, laboratory B was 5.4557 and laboratory C was 0,000. The result of determining Pb of gas station soil samples in laboratory A is 0.737 µg/L and laboratory B is 0.391 µg/L, so that means they have exceeded the quality standards set...
Eurasian Journal of Biosciences, Sep 1, 2020
Molecular and Cellular Bimedical Sciences, Jul 1, 2019
PROSIDING SEMINAR KIMIA, Oct 2, 2021
Development of chlorampenicol analytical method UV-VIS spectrophotometry based on the diazotation... more Development of chlorampenicol analytical method UV-VIS spectrophotometry based on the diazotation reaction at cold temperatures has been carried out. In this study, a coupling reaction was carried out between diazonium salt sourced from sulfanilamide and chlorampenicol, diazonium salt was made by reacting sodium nitrite and HCl with sulfanilamide. In the manufacturing process and the coupling reaction between diazonium salt and chlorampenicol was carried out at cold temperatures and the resulting compound was stable at ± 10°C. The compound formed was an azo sulfanilamide-CAP compound and was measured by UV-Vis spectrophotometry at a wavelength of 400,941 nm.
Proceeding The International Symposium of Human Development and Sustainable Utilization of Natural Resources in Asian Countries and The 6th Korea-Thailand-Indonesia Joint Symposium on Biomas Utilization and Renewable Energy, Jul 1, 2012
Jurnal Sains Dasar UNY, Nov 1, 2014
PROSIDING SEMINAR KIMIA, Oct 3, 2021
Synthesis of silver nanoparticles (AgNPs) was made by chemical reduction method. The reaction bet... more Synthesis of silver nanoparticles (AgNPs) was made by chemical reduction method. The reaction between silver nitrate (AgNO 3) with trisodium citrate will form silver nanoparticles (AgNPs) which are characterized by a significant color change from clear to yellow. The resulting silver nanoparticles (AgNPs) were characterized using a UV-Vis Spectrophotometer in the optimization stage in order to obtain AgNPs that were already in optimum condition and produced a stable yellow color. The results of the UV-Vis Spectrophotometer characterization showed that the most optimum nanoparticles were found at a concentration of 1 mM using a heating temperature of 85 0 C with the addition of 7 mL of trisodium citrate in 13 minutes. The use of trisodium citrate in the synthesis of silver nanoparticles (AgNPs) acts as a reducing agent and stabilizer. The stability test of silver nanoparticles (AgNPs) was carried out for 15 days and produced a stable color on the 7 th day which was indicated by the color of the yellow solution.
Proceeding The International Symposium of Human Development and Sustainable Utilization of Natural Resources in Asian Countries and The 6th Korea-Thailand-Indonesia Joint Symposium on Biomas Utilization and Renewable Energy, Jul 1, 2012
Research on the determination of Pb 2+ ions (lead)in hair repair shop employee in the city of Sam... more Research on the determination of Pb 2+ ions (lead)in hair repair shop employee in the city of Samarinda. This study aims to determine whether there is a relationship between the concentration of lead ions in the workshop employees hair against old age and work. Measurements of Pb 2+ ions (lead) was performed using Atomic Absorption Spectrophotometer (AAS). Hair cut into small pieces, washed, crushed or burned into ashes and homogenized and analyzed by Atomic Absorption Spectrophotometer (AAS). The results obtained from the measurement and analysis of Pb 2+ ions concentration in hair repair shop employee is 0.2193 ppm and 0.3665 ppm lowest to highest. At the workshop employees there is a relationship between age and levels of Pb 2+ ions (lead) in the hair, while there was no correlation between long working white Pb, it's based on a statistical analysis of the results of the determination coefficient and linear regression. A. PENDAHULUAN Pencemaran logam terhadap lingkungan merup...
The research study of cadmium (II) metal ion adsorption in a solution by 2-mercaptobenzotiazole m... more The research study of cadmium (II) metal ion adsorption in a solution by 2-mercaptobenzotiazole modified cellulose and unmodified cellulose had been done. The aims of this research are to know the ability of 2-mercaptobenzotiazole modified and unmodified celluloses for adsorbing cadmium (II) metal ion with the composition of modification. The modification processes of cellulose were done by the composition variation between cellulose and MBT of 1:1, 1:2, and 1:3. The adsorption process of metal ions by 2-mercaptobenzotiazole modified cellulose were done by shaking at pH 3, 4, 5, 6, 7, 8, and 9 with the effect of metal ions concentration of 0.05; 0.1; 0,15; 0,2, and 0,25 mg/L. The analysis of functional groups of cellulose-MBT and cellulose unmodified was using FTIR Spectrophotometer. The analysis of cadmium (II) concentration metal ions as cadmium metals were done by atomic absorption spectrophotometer (AAS). The result of this research showed that on the functional groups which der...
Research Journal of Pharmacy and Technology, 2021
The development of the separation method has an essential role in developing science and technolo... more The development of the separation method has an essential role in developing science and technology for the separation and purification of an element or compound from other mixtures based on differences in physical and chemical properties. This research is more focused on the selection parameters of polystyrene-based resin production using diethylene triamine penta-acetate (DTPA) light, which used as a prototype for improved scale production. The Plackett-Burman design was used to select variables that have significant influence in Methylaminopolystyrene-Diethylenetriaminepentaacetate (MAP-DTPA) resin synthesis. Eleven variables such as mol ratio of Methylamino Polystyrene and diethylene triamine penta-acetate ligands, solvent volume, reaction time, stirring rate, reaction temperature, total volume, reaction pH, incubation time, ammonia concentration, and the addition of methanol were carried out for the selection of parameters or variables in the process of MAP-DTPA resin synthesis...
The modification of resin Ca Alginate with rice straw ash as a column filler material for preconc... more The modification of resin Ca Alginate with rice straw ash as a column filler material for preconcentration step of Mn(II) ion. Has been done Preconcentration method was used by off-line method, water samples were passed through the column and eluted with 0.1 M H2SO4. The eluate was taken and detected by using Spectrophotometer UV Visible. Optimum composition of modified resin Rice straw ash Ca Alginat were at 1% Na Alginate, 0.1 M CaCl2, and 0.5 g rice straw ash. The result of research shown the optimum condition of retention capacity ion Mn(II) was 0.08211 mg Mn / gr resin. The best sorption at pH 2, and optimum condition of eluent concentration 0.1 M H2SO4, sample volume 12 mL and eluent volume was 5 mL. The analytical performance of this method was good for determination of ion Mn(II) that could be evaluated by limit of detection about 0.7727 mg/L with the reproducibility level shown by the precentage of the coefficient variance was 1.179 %. This method could be applicated to det...
The analysis of changes in levels of copper (Cu) on the addition of silver ions (Ag) with electro... more The analysis of changes in levels of copper (Cu) on the addition of silver ions (Ag) with electrocoagulation method has been researched by using Atomic Absorption Spectrophotometer (AAS) as an instrument for the determination of levels. The addition of ionic silver (Ag) in a solution of copper (Cu) using varying concentrations of silver (Ag) 4, 6, 8, 10 and 12 ppm. The results showed that the effect of the addition of ionic silver (Ag) 4,6, 8, 10 and 12 resulted in changes in the levels of copper (Cu) are deposited successively in the ppm concentration is 9.375; 9.324; 9.272; 9.168; 9.142 and 9.116. Metalcontentof silver(Ag) in a medium containing copper (Cu) with a variety of metallic silver( Ag) differentat 4, 6, 8, 10 and 12ppm after the electrocoagulation metal contentof silver(Ag) depositedin the amount3.99; 5.99; 7.96; 9.91 and 11.88ppm. Keywords : Electrocoagulation, Copper(Cu), Silver(Ag)
Potential of Ciplukan plant as natural antioxidants, the aim of this research is to determine the... more Potential of Ciplukan plant as natural antioxidants, the aim of this research is to determine the antioxidant potential of Ciplukan plant. First step is to know the active compound of the plant. Alkaloid and saponin are present at ciplukan leaves, stem and fruit, meanwhile steroid is present at leaves and stem. Moreover, flavonoid and triterpenoid is only present at stem and fruit, respectively. Phytochemical test are employed to dermine the active compound in the leaves, stem and fruit of ciplukan. Brine shimp lethality test are conducted to determine toxicity of the extract.The LC 50 from the leaves extract is 962.054 ppm, stem extract is 753.558 ppm and at the fruit is 1.004,73 ppm . Antioxidant activity measurement conducted by reacting the sample with 1,1-difenil-2-pikrilhidrazil radical and measures the absorbance at wavelength 517 nm. Vitamin C is use as positive control. The inhibition concentration 50 vitamin C is 34.91 ppm. Meanwhile, the Inhibition concentration 50 of the...
JURNAL KIMIA MULAWARMAN, 2018
The reduction of copper concentration in the electroplating industry wastewater by electrodeposit... more The reduction of copper concentration in the electroplating industry wastewater by electrodeposition method by means of Atomic Absorption Spectrophotometer (AAS). The result of research showed that degradation and is big of elimination percent of copper metal have with the effect of time contact and voltage at optimum hence in getting results of final concentration of iron (Fe) successive plate 4,02 ppm and 2,84 ppm of concentration early 35,86 ppm and elimination percent of exclusion at optimum parameter in getting result successive 88,403 % and 92,069 %. While the results of the final concentration of Aluminium (Al) successive plate 2,38 ppm dan 2,22 ppm of concentration early 35,86 ppm and elimination percent of exclusion at optimum parameter in getting result successive 93,363 % dan 93,814%.