Amperometric Method for Trace Level Determination of the Fungicide, Thiram

Abstract

A b s t r a c t : Thiram, a dithiocarbamate fungicide, i s electrochemically active on glassy carbon electrodes in an aqueous medium. An amperometric method developed under optimized conditions produces smooth and reproducible responses, yielding linear calibration curves with a minimum detection limit of 1 . 0~1 0 .~ M, based on the signal-to-noise ratio (SIN) of 3. Application of t h i s methodology for t h e determination of Thiram in water leachates, collected a t various time intervals from a laboratory prepared soil bed, results in reliable results. Additionally, the amount of Thiram in an agricultural bean seed sample is well quantified using this methodology, thus demonstrating the applicability of the proposed amperometric method in real sample analysis. NMR and UV-visible spectroscopic methods confirm the presence of Thiram in the seed sample.K e y W o r d s : amperometry, cyclic voltammetry, dithiocarbamate fungicide.

Electrooxidation of DL-norvaline at Glassy Carbon Electrode: Approaching the Modified Electrode for Voltammetric Studies of Hydroquinone and Catechol

“…It has been reported that the repeated potential application would promote the build-up of deposited layers of compounds and its oxidation products. [7][8][9]35,36) . However, obtaining lower current values is probably due to the difficulty of the build-up of adsorbed layers as well as polymerization.…”

Tetramethylthiuram Disulfide

“…Thiram, being a toxic substance for aquatic life, should be detected with an acceptable accuracy. Among many methods available for the detection of thiram and related substances, gas chromatography, high performance liquid chromatography, thin layer densitometry, Fourier transform infrared spectroscopy, capillary electrophoresis and voltammetry have been successful for a variety of sample matrices (Procopio et al, 1988;Sharma et al, 2003;Weliwegamage, 2005 and2008). Special reagents have been used in many of these techniques to improve selectivity and/or sensitivity.…”

Solvent extraction followed by ultraviolet detection for investigation of tetramethylthiuram disulfide at soil-water interface

“…Among many methods available for the detection of thiram and related substances, gas chromatography, high performance liquid chromatography, thin layer densitometry, Fourier transform infrared spectroscopy, capillary electrophoresis and voltammetry have been successful for a variety of sample matrices (Procopio et al, 1988;Sharma et al, 2003;Weliwegamage, 2005 and2008). Special reagents have been used in many of these techniques to improve selectivity and/or sensitivity.…”