Insecticide Residues, Colorimetric Method for the Determination of Ethion Residues

Pesticide Residues

“…Graham and Orwoll (90) Cox (55,56) st,udied the colorimetric procedure for Guthion in which the pesticide is hydrolyzed to anthranilic acid, diazotized, and coupled with N-(1-naphthy1)ethylenediamine dihydrochloride. He reports a collaborative study in which Guthion was added t'o yarious fruits and vegetables a t levels of 0.3 to 1.56 p.p.m.…”

“…Graham and Orwoll (90) describe a procedure in which the ethion is hydrolyzed with ethanolic sodium hydroxide and the diethyl phosphorodithioic acid formed is determined spectrophotometrically as its complex copper salt absorbing at 418 µ. To make the procedure specific for ethion, Delnav is eliminated by a mercuric chloride treatment and other phosphate pesticides are eliminated by a dilute sodium hydroxide wash.…”

Gas-liquid chromatographic determination of ethion, ethion monooxon, and ethion dioxon in tissues of turkeys and cattle

“…More recently Price and Kunz (1970) and Kunz et al (1971) demonstrated ethion to be effective for control of Neoschongastia americana (Hirst), the turkey chigger. Graham and Orwall (1963), Archer et al (1963), Forman and Gilbert (1961), and Gunther et al (1962) described methods of detecting ethion. However, a gas chromatographic method was needed for determining the residues of ethion and its two most likely metabolites, ethion monooxon (O, O-diethyl S-(mercaptomethyl) phosphorothioate S-ester with O, O-diethyl phosphorodithioate) and ethion dioxon (S,S'-methylene , , ', '-tetraethyl phosphorothioate) in tissues of turkeys and cattle.…”