Publikace detail

Voltammetric monitoring of herbicide picloram using silver solid amalgam electrode.

Autoři: Bandžuchová Lenka | Šelešovská Renáta | Chýlková Jaromíra

Rok: 2013

Druh publikace: ostatní - článek ve sborníku

Název zdroje: XVII Euroanalysis

Název nakladatele: Polish Chemical Society

Místo vydání: Varšava

Strana od-do: 781

Tituly:

Jazyk	Název	Abstrakt	Klíčová slova
eng	Voltammetric monitoring of herbicide picloram using silver solid amalgam electrode.	Picloram (4-amino-3,5,6-trichloropyridine-2-carboxylic acid; PCR) is a systematic herbicide, which belongs to a group of pyridine herbicides. It is the most persistent member of this herbicide family and its half-life in soils can vary from one month to three years and depends on application rate, soil type, temperature or moisture. It is very good water soluble and high mobile in soils, which leads to contamination of groundwater. Therefore a simple and sensitive method for determination of this herbicide is required. Electrochemical methods have been already utilized as rapid and sensitive for determination of pesticides. Moreover voltammetric methods in combination with silver solid amalgam electrodes in various modifications, as working electrodes, have been utilized as sensitive tools in analysis of pesticides. The voltammetric behavior and determination of picloram was for the first time studied on a mercury meniscus modified silver solid amalgam electrode (m-AgSAE) using cyclic, DC and differential pulse voltammetry. The influence of supporting electrolyte and scan rate on the current response of picloram was examined to select the optimum experimental conditions. It was found that picloram provided one well-shaped cathodic (reduction) peak at potential -750 mV vs. Ag/AgCl in strong acidic medium. At optimized differential pulse voltammetric parameters, the linear dynamic range was measured from 0.5 to 9.0 umol L-1 and the low limit of detection and good repeatability were obtained. The proposed method was successfully applied in analysis of environmental samples spiked with picloram with good accuracy (residual standard deviations less than 5% for all samples, n = 5). By this way, m-AgSAE introduces sensitive voltammetric tool in analysis of picloram.	Voltammetry; determination; herbicide; picloram; silver solid amalgam electrode

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