Mechanisms of production of soil-bound residues of [14C]-parathion by microorganisms

Katan, J.; Lichtenstein, E. P.

doi:10.1021/jf60214a022

Cited by 50 publications

(20 citation statements)

References 13 publications

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“…In conjunction with this conclusion, Katan and Lichtenstein (1977) 14 reported 43% binding in soils of radiocarbon originating from Cparathion exposed to microbial cultures. Aminoparathion was the bound form and resulted from microbial reduction of the -NO^ group.…”

Section: +mentioning

confidence: 78%

Sorption of organophosphorus and carbamate insecticides by soil

Felsot¹,

Dahm²

1979

J. Agric. Food Chem.

132

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Section: +mentioning

confidence: 78%

Sorption of organophosphorus and carbamate insecticides by soil

Felsot¹,

Dahm²

1979

J. Agric. Food Chem.

132

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“…Bound residues of many urea, anilide, and phenoxy herbicides, for instance, were found to be formed via microbial transformation of the active ingredients to chloroanilines or chlorophenols (Hsu and Bartha, 1976;Stott et al, 1983). The involvement of microbes in binding was demonstrated also by Katan and Lichtenstein (1977) using [ 14 C]parathion. However, there are known instances of abiotic binding, such as immobilization of anilazine in soil through ligand exchange (Haider et al, 1993) or the entrapment of prometryn in the molecular net of humus (Khan, 1982).…”

Section: Discussionmentioning

confidence: 99%

Formation of Soil-Bound Residues of Cyprodinil and Their Plant Uptake

Dec

Haider

Rangaswamy

et al. 1997

J. Agric. Food Chem.

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The fungicide cyprodinil [4-cyclopropyl-6-methyl-2-(phenylamino)pyrimidine] labeled with 14 C in either the phenyl or the pyrimidyl ring was incubated with four different soils under various conditions to evaluate the formation of bound residues and their subsequent plant uptake. About 60% of the initially applied radioactivity was bound to nonsterile soils within 90-180 days, whereas negligible binding was observed under sterile and anaerobic conditions. More binding was observed at higher soil pH, cation exchange capacity, and organic carbon and nitrogen contents. When spring barley was grown in the methanol-extracted soil, the plant uptake of bound residues amounted to about 0.2% for the phenyl label and 1.2% for the pyrimidyl label. The difference indicated that the pyrimidyl moiety was detached from the cyprodinil molecule and taken up more readily.

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“…This is not true for some phosphoramidates, however, such as isofenphos, in which cases the oxons formed may be fairly persistent in soil (Felsot, 1984). Some compounds, such as parathion, can be either reduced (amino-parathion) or oxidized (paraoxon) (Katan and Lichtenstein, 1977). An important consideration about many of these processes, however, is their reversibility.…”

Section: Redoxmentioning

confidence: 99%