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.