Formation of trialkyl phosphorothioate esters from organophosphorus insecticides after exposure to either ultraviolet light or sunlight

The phosphoramidothioate insecticides, methyl parathion, methidathion, azinphos-methyl, fenthion and malathion, and a phosphoramidothioate, acephate, were irradiated as thin films with either sunlight or ultraviolet light. Following irradiation, the samples were analyzed for the presence of trimethy...

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Bibliographic Details
Published in:Journal of agricultural and food chemistry 1989-03, Vol.37 (2), p.539-545
Main Authors: Chukwudebe, Amechi, March, Ralph B., Othman, Mohamed, Fukuto, T. Roy
Format: Article
Language:English
Subjects:
Biological and medical sciences
Chemical control
COMPOSE ORGANOPHOSPHORE
COMPUESTO ORGANICO DEL FOSFORO
Control
ENERGIA SOLAR
ENERGIE SOLAIRE
Fundamental and applied biological sciences. Psychology
INSECTICIDAS
INSECTICIDE
INSECTICIDES
Medical sciences
MOLECULAR WEIGHT
ORGANOPHOSPHORUS COMPOUNDS
PESO MOLECULAR
Pesticides, fertilizers and other agrochemicals toxicology
Phytopathology. Animal pests. Plant and forest protection
POIDS MOLECULAIRE
Protozoa. Invertebrates
RADIACION ULTRAVIOLETA
RAYON ULTRAVIOLET
SOLAR ENERGY
Toxicology
ULTRAVIOLET RADIATION
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Summary:The phosphoramidothioate insecticides, methyl parathion, methidathion, azinphos-methyl, fenthion and malathion, and a phosphoramidothioate, acephate, were irradiated as thin films with either sunlight or ultraviolet light. Following irradiation, the samples were analyzed for the presence of trimethyl phosphorothioate and dithioate esters. These compounds were detected in all of the samples with the exception of acephate, and the levels of the products were related to the UV extinction coefficient and absortion maxima of the insecticide. Based on the recommended field use rates of these insecticides, photoalteration products are not expected to pose a toxic hazard to farm workers.
ISSN:0021-8561
1520-5118
DOI:10.1021/jf00086a058