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Asian Journal of Research in Chemistry
Year : 2020, Volume : 13, Issue : 2
First page : ( 97) Last page : ( 102)
Print ISSN : 0974-4169. Online ISSN : 0974-4150.
Article DOI : 10.5958/0974-4150.2020.00020.6

A Sensitive Spectrophotometric Method for the Determination of Thiram Fungicides and its Application in Environmental Samples

Mannewar Kaushilya*, Dr. Tiwari Kishore K.**

Department of Chemistry, Govt. Nagarjuna P. G. College of Science, Raipur, 492010, Chhattisgarh, India

*Corresponding Author E-mail: kaushilyachem@gmail.com

**kktiwari05@gmail.com

Online published on 7 April, 2020.

Abstract

A sensitive spectrophotometric method based on the evolution of CS2 and colour development by leuco malachite green (LMG) is described for the determination of thiram fungicides, thiram releases CS2 on acid hydrolysis. This CS2 is absorbed in ethanolic sodium hydroxide and xanthate. The xanthate is subsequently treated with potassium iodate and N-chlorosuccinimide, during which free iodine is librated. Malachite green (MG) dye was formed through selective oxidation of leuco malachite green (LMG) by liberated iodine, which has an absorbance maximum (λmax) at 610nm. The colour system obeys Beer, s law in the range of 0.7–7μg per 25ml of final solution of thiram (0.028–0.28 ppm). The molar absorptivity and Sandell's sensitivity of the method were found to be 6×10-2l mol-1 cm-1, and 4.0073μgcm-2, for thiram. Statistical treatment of the experimental results indicates that the method is precise and accurate. The method is free from interference of common ions and fungicides. The reliability of the method was established by parallel determination against reported method. The method has been successfully applied to the determination of thiram fungicides in various environmental samples.

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Keywords

Spectrophotometric, thiram fungicides, N-chlorosuccinimide, leuco malachite green (LMG), malachite green (MG).

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