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Soo Beng. Khoo - One of the best experts on this subject based on the ideXlab platform.
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differential pulse voltammetric determination of trace te iv at a poly 3 3 Diaminobenzidine film modified gold electrode in flow systems
Analytica Chimica Acta, 2002Co-Authors: Soo Beng. KhooAbstract:Electropolymerization of 3,3′-Diaminobenzidine on a gold surface gave an adherent, stable film of poly(3,3′-Diaminobenzidine) (PDAB). This polymer film retained the complexational functionalities of its monomer, demonstrating preconcentration abilities for several ions, including Se(IV) and Te(IV). In particular, in this work, continuous flow and flow injection methods were developed for the sensitive and selective determination of Te(IV). The optimized method for the continuous flow mode had a detection limit of 5.6×10−9 mol l−1 for 10 min preconcentration. Typical relative standard deviations for six consecutive determinations were 1.82 and 2.56% for Te(IV) concentrations of 1.0×10−6 and 5.0×10−8 mol l−1, respectively (10 min preconcentration). The method was applied to the determination of Te(IV) in real samples.
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Differential pulse voltammetric determination of trace Te(IV) at a poly(3,3′-Diaminobenzidine) film modified gold electrode in flow systems
Analytica Chimica Acta, 2002Co-Authors: Soo Beng. KhooAbstract:Electropolymerization of 3,3′-Diaminobenzidine on a gold surface gave an adherent, stable film of poly(3,3′-Diaminobenzidine) (PDAB). This polymer film retained the complexational functionalities of its monomer, demonstrating preconcentration abilities for several ions, including Se(IV) and Te(IV). In particular, in this work, continuous flow and flow injection methods were developed for the sensitive and selective determination of Te(IV). The optimized method for the continuous flow mode had a detection limit of 5.6×10−9 mol l−1 for 10 min preconcentration. Typical relative standard deviations for six consecutive determinations were 1.82 and 2.56% for Te(IV) concentrations of 1.0×10−6 and 5.0×10−8 mol l−1, respectively (10 min preconcentration). The method was applied to the determination of Te(IV) in real samples.
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Poly(3,3'-Diaminobenzidine) Film on a Gold Electrode for Selective Preconcentration and Stripping Analysis of Selenium(IV)
Analytical Chemistry, 1994Co-Authors: Qiantao Cai, Soo Beng. KhooAbstract:Electropolymerizatoin of 3,3'-Diaminobenzidine at solid substrate electrodes (platinum, gold, and glassy carbon) gave stable and water-insoluble films under a wide range of pH. Under the conditions of this study, the polymer films were found to be electroactive in acidic solutions but not in neutral or basic solutions. The poly(3,3'-Diaminobenzidine)-modified gold electrode exhibited very high selectivity for the open circuit accumulation of Se-(IV) through complexatoin with the aromatic o-diamine groups attached to the polymer backbone to form the piaselenole. This property was exploited for the preconcentration of Se(IV), followed by differential pulse anodic stripping voltammetry for its determination.
Mayakrishnan Prabakaran - One of the best experts on this subject based on the ideXlab platform.
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transition metal complexes of novel binuclear schiff base derived from 3 3 Diaminobenzidine synthesis characterization thermal behavior dft antimicrobial and molecular docking studies
Journal of Coordination Chemistry, 2020Co-Authors: Venkittapuram Palaniswamy Radha, Subramanian Chitra, Suyambulingam Jonekirubavathi, Ill-min Chung, Seung-hyun Kim, Mayakrishnan PrabakaranAbstract:A series of binuclear Co(II), Ni(II), Cu(II), and Zn(II) complexes were prepared with a novel bidentate Schiff base ligand derived by condensation of 3,3′-Diaminobenzidine with creatinine. The prep...
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Transition metal complexes of novel binuclear Schiff base derived from 3,3′-Diaminobenzidine: synthesis, characterization, thermal behavior, DFT, antimicrobial and molecular docking studies
Journal of Coordination Chemistry, 2020Co-Authors: Venkittapuram Palaniswamy Radha, Subramanian Chitra, Suyambulingam Jonekirubavathi, Ill-min Chung, Seung-hyun Kim, Mayakrishnan PrabakaranAbstract:A series of binuclear Co(II), Ni(II), Cu(II), and Zn(II) complexes were prepared with a novel bidentate Schiff base ligand derived by condensation of 3,3′-Diaminobenzidine with creatinine. The prep...
I-wen Sun - One of the best experts on this subject based on the ideXlab platform.
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cathodic stripping voltammetric determination of selenium iv at a nafion coated mercury film electrode modified with 3 3 Diaminobenzidine
Electroanalysis, 2000Co-Authors: Hao Yun Yang, I-wen SunAbstract:Determination of selenium(IV) was investigated on a 3,3′-Diaminobenzidine/Nafion/mercury film modified glassy carbon electrode (DNMFE). The 3,3′-Diaminobenzidine/Nafion coating solution was irradiated by a tungsten light bulb to oxidize the 3,3′-Diaminobenzidine. This coating solution was then spin-coated onto a glassy carbon electrode. Subsequently, mercury was electrodeposited onto the electrode surface. Selenium(IV) was preconcentrated onto the DNMFE from the sample solution saturated with ethylenediaminetetraacetate (EDTA) at an accumulation potential of –0.35 V, and determined by cathodic square-wave stripping voltammetry (SWSV). Various parameters affecting the selenium determination were examined. With 5 min accumulation, the analytical signal was linear from 1 to 300 µgL–1, and the detection limit was 0.48 µgL–1. The proposed procedure showed a good accumulation efficiency for selenium and good resistance to interferences from metal ions as well as surface-active compounds.
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Determination of selenium(IV) by a photooxidized 3,3'-Diaminobenzidine/perfluorinated polymer mercury film electrode
Analytical chemistry, 2000Co-Authors: Hao Yun Yang, I-wen SunAbstract:A new, and easily fabricated, chemically modified electrode for the determination of selenium(IV) was examined by cathodic square-wave stripping voltammetry. This new electrode consisted of an anion-exchange perfluorinated polymer (Tosflex) coated thin mercury film electrode containing photooxidized 3,3'-Diaminobenzidine (ODAB). The coating solution of Tosflex and ODAB was spin-coated on a glassy carbon electrode followed by electroplating of a thin film of mercury. During the preconcentration, ODAB was reduced electrochemically and selenium was accumulated simultaneously onto the electrode by interacting with the reduced ODAB. After a 5-min preconcentration period, linear response was observed from 0.5 to 50 ppb selenium, and the detection limit was 0.1 ppb. The proposed method does not require a darkened room, which was required in many of the previous methods involving 3,3'-Diaminobenzidine. In addition, the resistance to interference from surface-active compounds was improved by incorporating Tosflex in the film.
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determination of selenium iv by a photooxidized 3 3 Diaminobenzidine perfluorinated polymer mercury film electrode
Analytical Chemistry, 2000Co-Authors: Hao Yun Yang, I-wen SunAbstract:A new, and easily fabricated, chemically modified electrode for the determination of selenium(IV) was examined by cathodic square-wave stripping voltammetry. This new electrode consisted of an anion-exchange perfluorinated polymer (Tosflex) coated thin mercury film electrode containing photooxidized 3,3'-Diaminobenzidine (ODAB). The coating solution of Tosflex and ODAB was spin-coated on a glassy carbon electrode followed by electroplating of a thin film of mercury. During the preconcentration, ODAB was reduced electrochemically and selenium was accumulated simultaneously onto the electrode by interacting with the reduced ODAB. After a 5-min preconcentration period, linear response was observed from 0.5 to 50 ppb selenium, and the detection limit was 0.1 ppb. The proposed method does not require a darkened room, which was required in many of the previous methods involving 3,3'-Diaminobenzidine. In addition, the resistance to interference from surface-active compounds was improved by incorporating Tosflex in the film.
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Cathodic stripping voltammetric determination of selenium(IV) at a nafion coated mercury film electrode modified with 3,3′-Diaminobenzidine
Electroanalysis, 2000Co-Authors: Hao Yun Yang, I-wen SunAbstract:Determination of selenium(IV) was investigated on a 3,3′-Diaminobenzidine/Nafion/mercury film modified glassy carbon electrode (DNMFE). The 3,3′-Diaminobenzidine/Nafion coating solution was irradiated by a tungsten light bulb to oxidize the 3,3′-Diaminobenzidine. This coating solution was then spin-coated onto a glassy carbon electrode. Subsequently, mercury was electrodeposited onto the electrode surface. Selenium(IV) was preconcentrated onto the DNMFE from the sample solution saturated with ethylenediaminetetraacetate (EDTA) at an accumulation potential of –0.35 V, and determined by cathodic square-wave stripping voltammetry (SWSV). Various parameters affecting the selenium determination were examined. With 5 min accumulation, the analytical signal was linear from 1 to 300 µgL–1, and the detection limit was 0.48 µgL–1. The proposed procedure showed a good accumulation efficiency for selenium and good resistance to interferences from metal ions as well as surface-active compounds.
Venkittapuram Palaniswamy Radha - One of the best experts on this subject based on the ideXlab platform.
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transition metal complexes of novel binuclear schiff base derived from 3 3 Diaminobenzidine synthesis characterization thermal behavior dft antimicrobial and molecular docking studies
Journal of Coordination Chemistry, 2020Co-Authors: Venkittapuram Palaniswamy Radha, Subramanian Chitra, Suyambulingam Jonekirubavathi, Ill-min Chung, Seung-hyun Kim, Mayakrishnan PrabakaranAbstract:A series of binuclear Co(II), Ni(II), Cu(II), and Zn(II) complexes were prepared with a novel bidentate Schiff base ligand derived by condensation of 3,3′-Diaminobenzidine with creatinine. The prep...
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Transition metal complexes of novel binuclear Schiff base derived from 3,3′-Diaminobenzidine: synthesis, characterization, thermal behavior, DFT, antimicrobial and molecular docking studies
Journal of Coordination Chemistry, 2020Co-Authors: Venkittapuram Palaniswamy Radha, Subramanian Chitra, Suyambulingam Jonekirubavathi, Ill-min Chung, Seung-hyun Kim, Mayakrishnan PrabakaranAbstract:A series of binuclear Co(II), Ni(II), Cu(II), and Zn(II) complexes were prepared with a novel bidentate Schiff base ligand derived by condensation of 3,3′-Diaminobenzidine with creatinine. The prep...
Hao Yun Yang - One of the best experts on this subject based on the ideXlab platform.
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cathodic stripping voltammetric determination of selenium iv at a nafion coated mercury film electrode modified with 3 3 Diaminobenzidine
Electroanalysis, 2000Co-Authors: Hao Yun Yang, I-wen SunAbstract:Determination of selenium(IV) was investigated on a 3,3′-Diaminobenzidine/Nafion/mercury film modified glassy carbon electrode (DNMFE). The 3,3′-Diaminobenzidine/Nafion coating solution was irradiated by a tungsten light bulb to oxidize the 3,3′-Diaminobenzidine. This coating solution was then spin-coated onto a glassy carbon electrode. Subsequently, mercury was electrodeposited onto the electrode surface. Selenium(IV) was preconcentrated onto the DNMFE from the sample solution saturated with ethylenediaminetetraacetate (EDTA) at an accumulation potential of –0.35 V, and determined by cathodic square-wave stripping voltammetry (SWSV). Various parameters affecting the selenium determination were examined. With 5 min accumulation, the analytical signal was linear from 1 to 300 µgL–1, and the detection limit was 0.48 µgL–1. The proposed procedure showed a good accumulation efficiency for selenium and good resistance to interferences from metal ions as well as surface-active compounds.
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Determination of selenium(IV) by a photooxidized 3,3'-Diaminobenzidine/perfluorinated polymer mercury film electrode
Analytical chemistry, 2000Co-Authors: Hao Yun Yang, I-wen SunAbstract:A new, and easily fabricated, chemically modified electrode for the determination of selenium(IV) was examined by cathodic square-wave stripping voltammetry. This new electrode consisted of an anion-exchange perfluorinated polymer (Tosflex) coated thin mercury film electrode containing photooxidized 3,3'-Diaminobenzidine (ODAB). The coating solution of Tosflex and ODAB was spin-coated on a glassy carbon electrode followed by electroplating of a thin film of mercury. During the preconcentration, ODAB was reduced electrochemically and selenium was accumulated simultaneously onto the electrode by interacting with the reduced ODAB. After a 5-min preconcentration period, linear response was observed from 0.5 to 50 ppb selenium, and the detection limit was 0.1 ppb. The proposed method does not require a darkened room, which was required in many of the previous methods involving 3,3'-Diaminobenzidine. In addition, the resistance to interference from surface-active compounds was improved by incorporating Tosflex in the film.
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determination of selenium iv by a photooxidized 3 3 Diaminobenzidine perfluorinated polymer mercury film electrode
Analytical Chemistry, 2000Co-Authors: Hao Yun Yang, I-wen SunAbstract:A new, and easily fabricated, chemically modified electrode for the determination of selenium(IV) was examined by cathodic square-wave stripping voltammetry. This new electrode consisted of an anion-exchange perfluorinated polymer (Tosflex) coated thin mercury film electrode containing photooxidized 3,3'-Diaminobenzidine (ODAB). The coating solution of Tosflex and ODAB was spin-coated on a glassy carbon electrode followed by electroplating of a thin film of mercury. During the preconcentration, ODAB was reduced electrochemically and selenium was accumulated simultaneously onto the electrode by interacting with the reduced ODAB. After a 5-min preconcentration period, linear response was observed from 0.5 to 50 ppb selenium, and the detection limit was 0.1 ppb. The proposed method does not require a darkened room, which was required in many of the previous methods involving 3,3'-Diaminobenzidine. In addition, the resistance to interference from surface-active compounds was improved by incorporating Tosflex in the film.
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Cathodic stripping voltammetric determination of selenium(IV) at a nafion coated mercury film electrode modified with 3,3′-Diaminobenzidine
Electroanalysis, 2000Co-Authors: Hao Yun Yang, I-wen SunAbstract:Determination of selenium(IV) was investigated on a 3,3′-Diaminobenzidine/Nafion/mercury film modified glassy carbon electrode (DNMFE). The 3,3′-Diaminobenzidine/Nafion coating solution was irradiated by a tungsten light bulb to oxidize the 3,3′-Diaminobenzidine. This coating solution was then spin-coated onto a glassy carbon electrode. Subsequently, mercury was electrodeposited onto the electrode surface. Selenium(IV) was preconcentrated onto the DNMFE from the sample solution saturated with ethylenediaminetetraacetate (EDTA) at an accumulation potential of –0.35 V, and determined by cathodic square-wave stripping voltammetry (SWSV). Various parameters affecting the selenium determination were examined. With 5 min accumulation, the analytical signal was linear from 1 to 300 µgL–1, and the detection limit was 0.48 µgL–1. The proposed procedure showed a good accumulation efficiency for selenium and good resistance to interferences from metal ions as well as surface-active compounds.