PESTICIDE RESIDUES IN FOOD - 1979


    Sponsored jointly by FAO and WHO






    EVALUATIONS 1979





    Joint meeting of the
    FAO Panel of Experts on Pesticide Residues
    in Food and the Environment
    and the
    WHO Expert Group on Pesticide Residues
    Geneva, 3-12 December 1979



    DISULFOTON

    Explanation

    At the 11th Session of the CCPR some of the delegations considered the
    MRL of 0.5 mg/kg for potatoes recommended by the 1973 Meeting as too
    high. New data were received from the Netherlands.

    RESIDUES ON FOOD AND THEIR EVALUATION

    The data from the Netherlands for residues in potatoes were proposed
    in support of a reduction of the MRL to 0.2 mg/kg.

                                                                        
                    Application               Residues in mg/kg 105 days
    Year     No.  kg.a.i./ha   formulation       after application
                                                                        

    1971     1       1.5         granular        0.05,0.1,0.03,<0.01
                                    5%
    1971     1       1.5         granular        <0.01,<0.01,0.19,0.21
                                    5%
                                                                        

    Data used for evaluation in 1973 were in the following ranges:

                                                                     
    Ranges mg/kg     Number in ranges              Cumulative %
                                            1973 data      Total data
                                                                     
       n.d.                 54                 58               56
     na - 0.2               25                 85               85
    0.2 - 0.5                6                 91               92
    0.3 - 1.0                5                 97               97
       1.0                   3                100              100

    Total number of samples                    93              101
                                                                     

    19 results greater than 0.2 mg/kg were from 6 of the 22 trials
    reported in 1973.

    Appraisal

    The MRL of 0.5 mg/kg in potatoes has been reviewed at the request of
    the 11th Session of CCPR with the inclusion of fresh data, submitted
    by the Netherlands.  It was found that the proposed 0.2 mg/kg limit
    would cover only 85% of the total number of results obtained (during
    supervised trials carried out in accordance with the registered use
    patterns.

    The Panel was therefore of the opinion that the MRLs could be reduced
    only in the following circumstances:

    a)  A change in use patterns had resulted in lower residues, or
    b)  If extensive data from the worldwide use of the compound were
    available, to form a fair basis for the panel to consider the
    conditions of previous trials resulting in higher residues to be
    atypical.

    The meeting therefore decided to re-affirm its previous recommendation
    of 0.5 mg/kg for potatoes.
    

    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: 1981 evaluations)
       Disulfoton (Pesticide residues in food: 1984 evaluations)
       Disulfoton (Pesticide residues in food: 1991 evaluations Part II Toxicology)