Kinetic method for the determination of trace amounts of copper(II) in water matrices by its catalytic effect on the oxidation of 1,5-diphenylcarbazide
The chemical reaction between Cu(II) and 1,5-diphenylcarbazide (DPC) is revised from an analytical perspective. It is shown that instead of a Cu-DPC complex, an oxygen mediated DPC oxidation to diphenylcarbazone (DPCO) is the main reaction involved where Cu(II) acts as catalyst. Therefore, the signa...
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todo:paper_00032670_v539_n1-2_p317_Crespo2023-10-03T13:55:46Z Kinetic method for the determination of trace amounts of copper(II) in water matrices by its catalytic effect on the oxidation of 1,5-diphenylcarbazide Crespo, G.A. Andrade, F.J. Iñón, F.A. Tudino, M.B. Catalytic oxidation Cu DPC Spectrophotometric determination Catalyst activity Catalysts Copper Magnesium printing plates Optimization Oxidation Reaction kinetics Sensitivity analysis Water 1,5-diphenylcarbazide (DPC) Diphenylcarbazone (DPCO) Flow injection Kinetic methods Chemical reactions copper diphenylcarbazide magnesium oxygen water article calculation catalysis catalyst chemical parameters chemical reaction flow injection analysis kinetics oxidation priority journal sensitivity analysis validation process The chemical reaction between Cu(II) and 1,5-diphenylcarbazide (DPC) is revised from an analytical perspective. It is shown that instead of a Cu-DPC complex, an oxygen mediated DPC oxidation to diphenylcarbazone (DPCO) is the main reaction involved where Cu(II) acts as catalyst. Therefore, the signal observed corresponds to the oxidation product DPCO. Under certain specific conditions a chelate complex between Cu(II) and DPCO can also be observed. Kinetic parameters of these reactions are calculated. These results set the basis for the development of analytical methodologies for the determination of Cu(II) at ultra-trace levels. Since the study of interferences revealed Mg(II) as the most serious, an optimised flow injection system which allows the in-lineelimination of Mg(II) is presented. The limit of detection (k = 3) calculated for 10 blank replicates is 0.05 μg L-1 (injection volume 20 μL), the analytical sensitivity equals 48 μg-1 L and the sample throughput is 120 h-1. Obtained results for Cu(II) determination in natural waters as well as the validation of the analytical methodology will be given and discussed. © 2005 Elsevier B.V. All rights reserved. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00032670_v539_n1-2_p317_Crespo |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Catalytic oxidation Cu DPC Spectrophotometric determination Catalyst activity Catalysts Copper Magnesium printing plates Optimization Oxidation Reaction kinetics Sensitivity analysis Water 1,5-diphenylcarbazide (DPC) Diphenylcarbazone (DPCO) Flow injection Kinetic methods Chemical reactions copper diphenylcarbazide magnesium oxygen water article calculation catalysis catalyst chemical parameters chemical reaction flow injection analysis kinetics oxidation priority journal sensitivity analysis validation process |
| spellingShingle |
Catalytic oxidation Cu DPC Spectrophotometric determination Catalyst activity Catalysts Copper Magnesium printing plates Optimization Oxidation Reaction kinetics Sensitivity analysis Water 1,5-diphenylcarbazide (DPC) Diphenylcarbazone (DPCO) Flow injection Kinetic methods Chemical reactions copper diphenylcarbazide magnesium oxygen water article calculation catalysis catalyst chemical parameters chemical reaction flow injection analysis kinetics oxidation priority journal sensitivity analysis validation process Crespo, G.A. Andrade, F.J. Iñón, F.A. Tudino, M.B. Kinetic method for the determination of trace amounts of copper(II) in water matrices by its catalytic effect on the oxidation of 1,5-diphenylcarbazide |
| topic_facet |
Catalytic oxidation Cu DPC Spectrophotometric determination Catalyst activity Catalysts Copper Magnesium printing plates Optimization Oxidation Reaction kinetics Sensitivity analysis Water 1,5-diphenylcarbazide (DPC) Diphenylcarbazone (DPCO) Flow injection Kinetic methods Chemical reactions copper diphenylcarbazide magnesium oxygen water article calculation catalysis catalyst chemical parameters chemical reaction flow injection analysis kinetics oxidation priority journal sensitivity analysis validation process |
| description |
The chemical reaction between Cu(II) and 1,5-diphenylcarbazide (DPC) is revised from an analytical perspective. It is shown that instead of a Cu-DPC complex, an oxygen mediated DPC oxidation to diphenylcarbazone (DPCO) is the main reaction involved where Cu(II) acts as catalyst. Therefore, the signal observed corresponds to the oxidation product DPCO. Under certain specific conditions a chelate complex between Cu(II) and DPCO can also be observed. Kinetic parameters of these reactions are calculated. These results set the basis for the development of analytical methodologies for the determination of Cu(II) at ultra-trace levels. Since the study of interferences revealed Mg(II) as the most serious, an optimised flow injection system which allows the in-lineelimination of Mg(II) is presented. The limit of detection (k = 3) calculated for 10 blank replicates is 0.05 μg L-1 (injection volume 20 μL), the analytical sensitivity equals 48 μg-1 L and the sample throughput is 120 h-1. Obtained results for Cu(II) determination in natural waters as well as the validation of the analytical methodology will be given and discussed. © 2005 Elsevier B.V. All rights reserved. |
| format |
JOUR |
| author |
Crespo, G.A. Andrade, F.J. Iñón, F.A. Tudino, M.B. |
| author_facet |
Crespo, G.A. Andrade, F.J. Iñón, F.A. Tudino, M.B. |
| author_sort |
Crespo, G.A. |
| title |
Kinetic method for the determination of trace amounts of copper(II) in water matrices by its catalytic effect on the oxidation of 1,5-diphenylcarbazide |
| title_short |
Kinetic method for the determination of trace amounts of copper(II) in water matrices by its catalytic effect on the oxidation of 1,5-diphenylcarbazide |
| title_full |
Kinetic method for the determination of trace amounts of copper(II) in water matrices by its catalytic effect on the oxidation of 1,5-diphenylcarbazide |
| title_fullStr |
Kinetic method for the determination of trace amounts of copper(II) in water matrices by its catalytic effect on the oxidation of 1,5-diphenylcarbazide |
| title_full_unstemmed |
Kinetic method for the determination of trace amounts of copper(II) in water matrices by its catalytic effect on the oxidation of 1,5-diphenylcarbazide |
| title_sort |
kinetic method for the determination of trace amounts of copper(ii) in water matrices by its catalytic effect on the oxidation of 1,5-diphenylcarbazide |
| url |
http://hdl.handle.net/20.500.12110/paper_00032670_v539_n1-2_p317_Crespo |
| work_keys_str_mv |
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