Premium
Voltammetric determination of thiram following adsorptive accumulation on a rotating gold disk electrode
Author(s) -
Sevilla M. Teresa,
Procopio Jesús Rodriguez,
Pinilla Jose M.,
Hernandez Lucas
Publication year - 1990
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.1140020610
Subject(s) - thiram , detection limit , chemistry , adsorption , electrode , voltammetry , cyclic voltammetry , analytical chemistry (journal) , rotating disk electrode , chromatography , electrochemistry , organic chemistry , pesticide , agronomy , biology
The oxidation of thiram was studied by cyclic voltammetry on a rotating gold disk electrode. The oxidation process involves the adsorption of thiram. The limit of detection obtained was 0.04 μg/mL and the method was applied to thiram determination in formulations. The spontaneous adsorption of thiram on the rotating gold disk electrode produces a substantial enhancement of the voltammetric signal. This effect can be exploited as an effective accumulation step prior to the voltammetric measurement. The best results are obtained thiram solutions adjusted to pH 1 with phosphoric‐acetic acid buffer, an accumulation potential of 0.0 V, and a scan rate of 400 mV/s for the voltammetric step. Under these conditions, the detection limit was 0.3 ng/mL after 10 minutes of accumulation. The method was applied to the determination of thiram in water with good results.