Determination of Metribuzin with a Cobalt Phthalocyanine-Modified Carbon Paste Electrode
Metribuzin is a widely used pesticide with a half-life of up to 2 months and high affinity to organic matter that should be carefully monitored. Here is reported the development of a modified carbon paste electrode using cobalt phthalocyanine as a biomimetic catalyst for the determination of metribu...
| Autores: | , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2018 |
| País: | Brasil |
| Institución: | Universidade Estadual Paulista (UNESP) |
| Repositorio: | Repositório Institucional da UNESP |
| Idioma: | inglés |
| OAI Identifier: | oai:repositorio.unesp.br:11449/176074 |
| Acceso en línea: | http://dx.doi.org/10.1080/00032719.2017.1389950 http://hdl.handle.net/11449/176074 |
| Access Level: | acceso abierto |
| Palabra clave: | Biomimetic sensor cyclic voltammetry electroanalysis electrocatalysis metallophthalocyanine complexes |
| Sumario: | Metribuzin is a widely used pesticide with a half-life of up to 2 months and high affinity to organic matter that should be carefully monitored. Here is reported the development of a modified carbon paste electrode using cobalt phthalocyanine as a biomimetic catalyst for the determination of metribuzin. The diffusion coefficient of metribuzin at room temperature was (59 ± 16) × 10−6 cm2 s−1 and the apparent Michaelis–Menten constant (Kap M) was (7.4 ± 0.6) × 10−6 mol L−1. Electroanalytical measurements were performed by amperometry and the following figures of merit were obtained: limit of detection of 5.3 × 10−6 mol L−1 (1.14 mg L−1), linear range up to 2.0 × 10−4 mol L−1, recoveries above 93% (performed on spiked water samples), interday repeatability of 4.5% and intraday repeatability of 3.5%, and suitable selectivity. |
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