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A rapid method for the detection and determination of captan.

Visweswaraiah, K. and Jayaram, M. and Majumder, S. K. (1970) A rapid method for the detection and determination of captan. Analytica Chemica Acta, 52. pp. 559-561.

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Captan (N-trichloromethylthiotetrahydrophthalimide) has various industrial and agricultural applications, being used both as a fungicide at the 100-1000 p.p.m. level and in grain protection at levels above 1000 p.p.m.1. The practice of including insecticides such as Aldrin, Lindane, DDT or Dieldrin, with Captan as seed treatments for dual protection against soil insects and soil-borne pathogens has gained widespread acceptance2. Many methods have been suggested for detection and determination of Captan. KITTLESON2 has described a method in which resorcinol and Captan are heated at 135- 140° to form an intense red coloured compound; after treatment with acetic acid, the yellow colour is measured at 425 nm. ENGST AND SCHNASK3 have used a silver nitrate spray followed by ultraviolet irradiation in a thin-layer chromatographic method. IRWIN et al.4 have studied the response of Captan and its structurally related fungicides (Folpet, Difolatan) to several reagents such as resorcinol, permanganate, dimethyl-pphenylenediamine and chromic acid, also for thin-layer chromatography. A colorimetric determination of Captan has been based5 on its reaction with pyridine and tetraethylammonium hydroxide. Thin-layer chromatographic methods have been used at the nanogram level, and these have been used semiquantitatively6,7. In a previous report8, a rapid semiquantitative method for Captan based on its reaction with monoethanolamine was applied in the presence of Aldrin, DDT, BHC, Malathion, etc. The extension of this method to fully quantitative work is reported here.

Item Type: Article
Uncontrolled Keywords: Captan, fungicide, soil insects, soil-borne pathogens
Subjects: 600 Technology > 03 Agriculture > 05 Insect/Pest Control
Divisions: Food Protectants and Infestation Control
Depositing User: Food Sci. & Technol. Information Services
Date Deposited: 16 May 2012 10:53
Last Modified: 16 May 2012 10:53
URI: http://ir.cftri.com/id/eprint/2556

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