Spectrophotometric determination of ziram and zineb using 4‐(2‐pyridylazo) resorcinol

Abstract

A spectrophotometric method has been developed for the determination of ziram (zinc bis(dimethyldithiocarbamate)) and zineb (zinc ethylenebisdithiocarbarnate) by converting these into a zinc‐4‐(2‐pyridylazo)resorcinol complex, which is dissolved in acetone and water and the absorbance measured at 490 nm against a reagent blank. Beer's law is obeyed over the concentration ranges 0.025‐1.25 and 0.025‐1.5 mg litre−1 for ziram and zineb respectively in the final solution. The method is sensitive and can be used for the direct determination of ziram and zineb in commercial formulations, grains (rice and wheat) and synthetic mixtures (in the presence of various other dithiocarbamates). The limit of determination of ziram and zineb from foodstuffs in 0.2 mg kg −1.

Preconcentration of Ferbam [Fe(III) tris(dimethyldithiocarbamate)] Using 1-(2-Pyridylazo)-2-naphthol Modified β-Cyclodextrin Polymer

“…Double distilled water was used throughout the experiment. Ferbam was prepared as given in literature 27 . Its stock solution was prepared in dimethyl sulphoxide (DMSO).…”

Development of a derivative spectrophotometric method for the determination of fungicide zinc ethylenebisdithiocarbamate using sodium molybdate

“…Many methods like spectrophotometry, 1,[3][4][5][6][7][8] flame atomic absorption spectrometry 9,10 FT-IR, 11 gas chromatography, 12,13 HPLC, [14][15][16] polarography, 17,18 biosensors, 19 and enzyme linked immuno sorbent assay 20 are available for Zineb determination and other dithiocarbamates. Most of the applied methods use different techniques like spectrophotometry and gas chromatography 3 based on analysis of CS 2 , H 2 S or amines which are evolved by the decomposition of EBDCs.…”

Flow Injection/Atomic Absorption Spectrometric Determination of Zineb in Commercial Formulations of Pesticide Based on Slurry Sampling

“…Afterwards, other researchers applied the same approach, just detecting the CS2 formed by several other instrumental techniques, such as head space gas chromatography, 6 differential pulse polarography, 7 Fourier-transform infrared spectrometry 8 or UV-visible spectrophotometry. [9][10][11] During the last ten years, direct determinations of zineb (without hot acid decomposition) have also been carried out by spectrophotometry, 12,13 16 used a C60 fullerene column for zineb preconcentration (among other dithiocarbamate pesticides) in a flow system. After elution with a 0.2 mol l -1 HNO3 solution, the pesticide was injected in a flame AAS and the zinc was detected for quantification purposes.…”

“…Afterwards, other researchers applied the same approach, just detecting the CS2 formed by several other instrumental techniques, such as head space gas chromatography, 6 differential pulse polarography, 7 Fourier-transform infrared spectrometry 8 or UV-visible spectrophotometry. [9][10][11] During the last ten years, direct determinations of zineb (without hot acid decomposition) have also been carried out by spectrophotometry, 12,13 voltammetry, 14 amperometry 15 or flame atomic absorption. 16 Malik et al 12 and Kapoor and Rao 13 carried out spectrophotometric determinations of zineb, converting the pesticide into zinc-phenylfluorone and zinc-PAR (4-(2-pyridilazo)resorcinol) complexes, respectively.…”

“…[9][10][11] During the last ten years, direct determinations of zineb (without hot acid decomposition) have also been carried out by spectrophotometry, 12,13 voltammetry, 14 amperometry 15 or flame atomic absorption. 16 Malik et al 12 and Kapoor and Rao 13 carried out spectrophotometric determinations of zineb, converting the pesticide into zinc-phenylfluorone and zinc-PAR (4-(2-pyridilazo)resorcinol) complexes, respectively. Ulakhovich et al 14 determined zineb in fruits, vegetables and aqueous samples by voltammetry after its solvent extraction with CH2Cl2, while Marty and Noguer 15 explored the inhibition effect of zineb on the aldehyde dehydrogenase enzyme for its determination by amperometry.…”