Determination of Thiophanate-methyl (TM): A Well Known Fungicide by Potentiometric and Spectrophotometric Methods

作者：Kalia S B^*; Priyanka; Kaushal G; Lumba K

来源：Proceedings of the National Academy of Sciences India Section A-Physical Sciences, 2014, 84(4): 523-526.

DOI：10.1007/s40010-014-0167-z

• Thiophanate-methyl
• Spectrophotometric
• Potentiometric
• Fungicide
• Carbamate

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 lambda(max) = 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.

• 出版日期2014-12