Abstract
The instantaneous formation of green colour obtained on mixing methanolic solutions of thiophanate-methyl (TM) and iron(III) has led to the development of spectrophotometric and potentiometric titration procedures for the determination of thiophanate-methyl—a well known commercial fungicide. Spectrophotometric measurements have been made at λmax = 365 nm. Green colour results from the formation of a complex between disulphide derivative of TM i.e. TMDS (an oxidized product of TM) and iron(II)—a reduced form of iron(III). Potentiometric titrations are marked by an increase in potential with equivalence point at TM to iron(III) ratio of 4:1 (molar ratio). The methods have been successfully adapted to the analysis of commercial fungicide formulations. The proposed methods for the determination of TM are simple, rapid and reliable.
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Schedule a callMore From: Proceedings of the National Academy of Sciences, India Section A: Physical Sciences
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