1978Pesticide ScienceRequires access

Conversion rates of aldicarb and its oxidation products in soils. III. Aldicarb

J.H. Smelt, M. Leistra, N.W.H. Houx, A. Dekker

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Abstract

Abstract Aldicarb was incubated in seven soils at 15°C and its loss was well described by first‐order kinetics. Rate constants varied between 0.078 day−1 in a peaty sand to 0.35 day−1 in a clay loam. The concentration‐time relationships for aldicarb, its sulphoxide and its sulphone were approximated by a computation model which was used to analyse the importance of the various consecutive and simultaneous reactions. It was computed that 91 to 100% of the aldicarb would be oxidised to its sulphoxide.

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Abstract Aldicarb was incubated in seven soils at 15°C and its loss was well described by first‐order kinetics. Rate constants varied between 0.078 day−1 in a peaty sand to 0.35 day−1 in a clay loam. The concentration‐time relationships for aldicarb, its sulphoxide and its sulphone were approximated by a computation model which was used to analyse the importance of the various consecutive and simultaneous reactions. It was computed that 91 to 100% of the aldicarb would be oxidised to its sulphoxide.

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Available abstract

Abstract Aldicarb was incubated in seven soils at 15°C and its loss was well described by first‐order kinetics. Rate constants varied between 0.078 day−1 in a peaty sand to 0.35 day−1 in a clay loam. The concentration‐time relationships for aldicarb, its sulphoxide and its sulphone were approximated by a computation model which was used to analyse the importance of the various consecutive and simultaneous reactions. It was computed that 91 to 100% of the aldicarb would be oxidised to its sulphoxide.

Key concepts: Aldicarb, Loam, Soil water, Chemistry, Kinetics, Pesticide, Soil science, Agronomy

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