Fate of S- (2-methoxy-5-oxo-delta 2-1,3,4-thiadiazolin-4-yl) methyl) -O,O-dimethyl phosphorodithioate (Supracide) in field-grown agricultural crops and soil
Eberle, D.O.; Hörmann, W.D.
Journal - Association of Official Analytical Chemists 54(1): 150-159
1971
ISSN/ISBN: 0004-5756 PMID: 5162501 Document Number: 44166
Analytical methods are presented for routine determination of residues of unchanged Supracide (GS 13005; S-[(2-methoxy-5-oxo-Δ2-1,3,4-thiadiazolin-4-yl)methyl]-O,O-dimethyl phosphorodithioate), its oxygen analog (GS 13007), and 2-methoxy-5-oxo-Δ2-1,3,4-thiadiazolin (GS 12956) in different agricultural crops and soil. The unchanged insecticide is determined by gas chromatography, using both sodium thermionic and electrolytic conductivity detectors with a limit of detectability of 0.01 ppm. GS 13007 is detected on thin layer chromatographic plates by fly head cholinesterase inhibition and GS 12956 by silver nitrate with a detection limit of 0.01 ppm each. Average degradation curves from field trials are calculated statistically, and the penetration of GS 13005 into the meat and core of apples has been studied in field and laboratory experiments.