PESTICIDE RESIDUES IN FOOD - 1984


    Sponsored jointly by FAO and WHO






    EVALUATIONS 1984




    The monographs



    Data and recommendations of the joint meeting
    of the FAO Panel of Experts on Pesticide Residues
    in Food and the Environment and the
    WHO Expert Group on Pesticide Residues
    Rome, 24 September - 3 October 1984

    Food and Agriculture Organization of the United Nations
    Rome 1985

    DISULFOTON

    Explanation

         The CCPR at its Fourteenth Session asked the JMPR to consider
    whether the oxygen analogue of disulfoton could be excluded from the
    definition of the residue, currently "sum of disulfoton, demeton-S and
    their sulphoxides and sulphones, expressed as disulfoton".

    RESIDUES IN FOOD AND THEIR EVALUATION

         The residue evaluation of disulfoton by the 1973 JMPR was based
    mainly on values derived from the determination of total phosphorus
    after chromatographic clean-up with or without oxidation of the
    residue with m-chloroperbenzoic acid. Some determinations were by GLC
    after oxidation of the residue with permanganate to convert disulfoton
    and its sulphoxide to disulfoton sulphone, and the oxon and its
    sulphoxide to the oxon sulphone. When this procedure was used, the
    oxon sulphone was usually a substantial part of the total and
    sometimes exceeded the thion sulphone. There are no data on which to
    judge the proportion of the oxon itself in the total residue and no
    analytical simplification would be achieved by excluding it from the
    definition.

    RECOMMENDATION

         The definition of the residue should not be changed.

    See Also:
       Toxicological Abbreviations
       Disulfoton (ICSC)
       Disulfoton (WHO Pesticide Residues Series 3)
       Disulfoton (WHO Pesticide Residues Series 5)
       Disulfoton (Pesticide residues in food: 1978 evaluations)
       Disulfoton (Pesticide residues in food: 1979 evaluations)
       Disulfoton (Pesticide residues in food: 1981 evaluations)
       Disulfoton (Pesticide residues in food: 1991 evaluations Part II Toxicology)