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
PARATHION-METHYL
Explanation
The CCPR, at its Fourteenth Session, asked the JMPR to reconsider
the definition of the residue, currently "sum of parathion-methyl and
its oxygen analogue".
RESIDUES IN FOOD AND THEIR EVALUATION
Most of the analyses on which the earlier evaluations were based
did not differentiate between parathion-methyl and its oxon, but the
1968 evaluations indicated that the oxon represented only 1-4 percent
of the total biologically active residue on lettuce. When the oxon was
present it was found to be rapidly hydrolysed in and on the plant.
Data evaluated in 1979 show parathion-methyl residues of
1-40 mg/kg in soybeans and 0.3-6.6 mg/kg in soybean forage at
intervals of 1-14 days after treatment, while no oxon residues were
detected. Residues of parathion-methyl in cottonseed were usually
below the limit of determination, but reached measurable levels of
0.1-0.3 mg/kg in 12 samples. Residues of the oxon in all these were
below the limit of determination (0.05 mg/kg).
RECOMMENDATION
MRLs should be for parathion-methyl only without any numerical
change.