Determination of Metribuzin with a Cobalt Phthalocyanine-Modified Carbon Paste Electrode

被引：5
|
作者：
Figueira, Eduardo Carneiro [1 ]
dos Santos Ruy, Mayara Regina [1 ,2 ]
Wong, Ademar [1 ]
Goncalves, Luis Moreira [3 ,4 ]
Taboada Sotomayor, Maria del Pilar [1 ,2 ]
机构：
[1] UNESP Univ Estadual Paulista, Inst Chem, Dept Analyt Chem, Araraquara, SP, Brazil
[2] Natl Inst Alternat Technol Detect Toxicol Evaluat, Araraquara, SP, Brazil
[3] Univ Porto, REQUIMTE LAQV, Fac Ciencias, Porto, Portugal
[4] Univ Sao Paulo, Inst Quim, Dept Quim Fundamental, Sao Paulo, SP, Brazil
来源：
ANALYTICAL LETTERS | 2018年 / 51卷 / 11期
基金：
巴西圣保罗研究基金会;
关键词：
Biomimetic sensor; cyclic voltammetry; electroanalysis; electrocatalysis; metallophthalocyanine complexes; MAJOR CONVERSION PRODUCTS; HERBICIDE METRIBUZIN; ELECTROCHEMICAL-BEHAVIOR; DIFFUSION-COEFFICIENTS; LIQUID-CHROMATOGRAPHY; BIOMIMETIC CATALYST; SELECTIVE DETECTION; MERCURY-ELECTRODES; SENSOR; VOLTAMMETRY;
D O I：
10.1080/00032719.2017.1389950
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
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)x10(-6)cm(2)s(-1) and the apparent Michaelis-Menten constant (K-M(ap)) was (7.4 +/- 0.6)x10(-6)molL(-1). Electroanalytical measurements were performed by amperometry and the following figures of merit were obtained: limit of detection of 5.3x10(-6)molL(-1) (1.14mgL(-1)), linear range up to 2.0x10(-4)molL(-1), recoveries above 93% (performed on spiked water samples), interday repeatability of 4.5% and intraday repeatability of 3.5%, and suitable selectivity.
引用
收藏
页码：1694 / 1704
页数：11
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