Square wave voltammetric determination of diquat using natural phosphate modified platinum electrode
| Autor: | Sara Lahrich, M. Achak, H. El Harmoudi, Mina Bakasse, L. El Gaini, M.A. El Mhammedi, Abdelfettah Farahi |
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| Rok vydání: | 2012 |
| Předmět: |
Chemistry(all)
Square wave voltammetry General Chemical Engineering Inorganic chemistry chemistry.chemical_element Platinum electrode 02 engineering and technology Electrolyte 01 natural sciences Diquat lcsh:Chemistry chemistry.chemical_compound Natural phosphate Detection limit 010401 analytical chemistry General Chemistry Square wave 021001 nanoscience & nanotechnology Phosphate 0104 chemical sciences Electrochemical gas sensor lcsh:QD1-999 chemistry Electrode Chemical Engineering(all) 0210 nano-technology Platinum |
| Zdroj: | Arabian Journal of Chemistry, Vol 10, Iss S1, Pp S671-S676 (2017) |
| ISSN: | 1878-5352 |
| DOI: | 10.1016/j.arabjc.2012.11.007 |
| Popis: | A platinum electrode modified with natural phosphate (NP) was evaluated as an electrochemical sensor for diquat (DQ) in aqueous medium. The electrode was prepared by the deposition of natural phosphate on the platinum surface. Diquat was preconcentrated on the surface of the modified electrode by adsorbing with natural phosphate and reduced at a negative potential in 0.1 M K 2 SO 4 solution. The influence of accumulation time and pH of the electrolytic solution were investigated. The calibration graph obtained under the optimized conditions was linear with a correlation coefficient of 0.9813 at levels near the detection limits up to at least 5.32 × 10 −9 mol L −1 with the relative standard deviation (RSD) lower than 3.37%. Interferences by some metals were investigated. Fe, Zn, Cu, MnO 4 and Hg apparently affected the peak currents P 1 and P 2 of diquat. The natural phosphate modified platinum electrode was applied to the determination of diquat in natural water samples. The results indicate that this electrode is sensitive and effective for the determination of diquat. |
| Databáze: | OpenAIRE |
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