Residue analysis of Sumithion

Abstract

Up to date, various residue analytical methods of Sumithion such as colorimetric methods, enzymatic methods, and gas chromatographic (GLC) methods have been developed. Colorimetric determinations are carried out either by reducing Sumithion according to Averell and Norris (1948) or by measuring 3-methyl-4-nitrophenol after hydrolysis under alkaline conditions (Miyamoto et al. 1965 a and b); the limit of determination is usually around 0.05 ppm. Determination of lesser amounts of Sumithion can be conducted utilizing cholinesterase inhibition (Ackerman 1966, Miyamoto et al. 1967, Winterlin et al. 1968, Schutzman and Bartel 1969, Mendoza et al. 1968, Ernst and Schuring 1970, Stijve and Cardinale 1971, Renvall and Akerblom 1971). However, these methods require more or less elaborate cleanup procedures, whereas GLC methods are simple and reliable with limits of detection of 0.01 to 0.001 ppm (Miyamoto et al. 1967, Sato et al. 1968, Bowman and Beroza 1969, Storherr et al. 1970, Miyamoto 1973). Therefore, the GLC methods are discussed in detail in this chapter as the recommended method of residue analysis.