FAO/PL:1968/M/9/1 WHO/FOOD ADD./69.35 1968 EVALUATIONS OF SOME PESTICIDE RESIDUES IN FOOD THE MONOGRAPHS Issued jointly by FAO and WHO The content of this document is the result of the deliberations of the Joint Meeting of the FAO Working Party of Experts and the WHO Expert Committee on Pesticide Residues, which met in Geneva, 9-16 December, 1968. FOOD AND AGRICULTURE ORGANIZATION OF THE UNITED NATIONS WORLD HEALTH ORGANIZATION Geneva, 1969 DIAZINON Since the previous evaluation (FAO/WHO, 1968) additional data have become available and are summarized and discussed in the following monograph addendum. RESIDUES IN FOOD AND THEIR EVALUATION Background The 1967 Joint Meeting recommended a temporary tolerance of 0.5 ppm diazinon in meat (fat basis). At the Third Session of the Codex Committee on Pesticide Residues, the delegation of Australia proposed that the temporary tolerance should be increased to 0.75 ppm in meat (fat basis) (CCPR, 1968). It was agreed that Australia should submit to the FAO Secretariat data justifying an increase in the recommended tolerance (Australia, 1968). Use pattern Diazinon is applied in the form of emulsions and wettable powders for the control of ticks, lice, flies, mosquitos and sand-flies attacking cattle. The preparations are applied as sprays or in the form of dips through which the animals must swim. The concentration used for such treatment ranges from 0.04 per cent to 0.1 per cent. Residues resulting from supervised trials Robbins et al. (1957) showed, by using 32P- labelled diazinon, that the insecticide is metabolized and excreted when fed to a cow. Studies by Rai and Roan (1962) using conventional chemical methods as well as 32P- labelled diazinon showed that no significant residues occurred in animal tissues when diazinon was administered in feed. Harrison and Hastie (1965) showed that there were no significant residues in the milk of cows and fat of sheep feeding on pasture treated by diazinon. Hastie (1963a and b) reviewed recent work on diazinon residues in the meat and fat of sheep and cattle and in the milk of cows following dipping or spraying. The extensive trials reported show that the residues of diazinon in subcutaneous fatty tissue of sheep and cattle, treated for parasite control, do not exceed 0.75 ppm even one day after treatment. However, internal fat from such animals may contain over 1 ppm following dipping or spraying. The average residue level declines rapidly following treatment but samples from individual animals may exceed 0.75 ppm for more than 14 days. Hastie (1965) showed that standard treatment procedures resulted in residues in excess of 1 ppm in the fat of sheep one day post-treatment. After three days it has declined to 0.3-0.5 ppm. Claborn et al. (1963) showed that cattle sprayed with diazinon had residues of 0.75 ppm in omental fat six days after treatment but that the level declined rapidly thereafter. After 14 days the level had fallen to less than 0.1 ppm. Diazinon has been used for a number of years as a treatment of sheep and cattle against external parasites in Australia, New Zealand, South Africa, Argentina, Brazil and Uruguay. To a lesser degree it has been used in the United States of America, Canada, Mexico, and the United Kingdom and other countries for similar purposes. National tolerances Country Product Tolerance (ppm) Australia Meat (fat basis) 0.75 United States of America Meat (fat basis) 0.75 RECOMMENDATIONS FOR TOLERANCES AND PRACTICAL RESIDUE LIMITS Appraisal The meeting considered new data on residues found in cattle that had been treated against ectoparasites in Australia and other countries. Results from applications by spraying and dipping animals were considered. The residues from plunge treatment tend to be greater than those from spraying but the meeting took the view that it would not be practical to consider only the latter figures. According to Hastie (1965) the maximum residues in omental and kidney fat after plunge treatment were 0.9 and 0.38 ppm by the third and eighth day respectively. Figures for diazinon in objective commercial samples of fat of sheep in Australia were also considered. They showed only a very small proportion to exceed 0.75 ppm. Recommendations The meeting confirms the previously recommended temporary tolerances (FAO/WHO, 1968) to be in effect until 1970 and in the case of the tolerance in meat (on a fat basis) recommends that the figure be raised from 0.5 to 0.75 ppm. The above temporary tolerances are to apply to raw agricultural products moving in commerce unless otherwise indicated. In the case of fruit and vegetables the tolerances should be applied as soon as practicable after harvest and in any event prior to actual retail to the public. In the case of commodities entering international trade, the tolerances should be applied by the importing country at the point of entry or as soon as practicable thereafter. REFERENCES Australia. (1968) Submission to 1968 Joint Meeting of the FAO Working Party of Experts and the WHO Expert Committee on Pesticide Residues. Prepared by the Australian Delegation to the Codex Committee on Pesticide Residues CCPR. (1968) Report of the Third Session of the Codex Committee on Pesticide Residues; (ALINORM 69/24) Claborn, H. V. et al. (1963) Diazinon residues in the fat of sprayed cattle. J. Econ. Entomol., 56: 858-859 FAO/WHO. (1968) 1967 evaluations of some pesticide residues in food (FAO, PL:1967/M/11/1; WHO/Food Add./68.30) Harrison, D. L. and Hastie, B. A. (1965) Diazinon residues in milk of cows, and fat of sheep after feeding on pasture treated with diazinon. New Zealand, J. Agr. Res., 9: 1-7 Hastie, B. A. (1963a) Diazinon residues in sheep and cattle. Publication by Geigy Agricultural Chemicals, Botany, Australia D15/4000/9/63 Hastie, B. A. (1963b) Diazinon residues in fat of cattle following dipping. Geigy report 63/7/162 Hastie, B. A. (1965) Diazinon residues in sheep fat. Geigy report M/BAH/27 Rai, L. and Roan, C. C. (1962) Report to NC-33 Regional Technical Committee from Department of Entomology, Kansas State University, Kansas, United States of America Robbins, W. F., Hopkins, T. L. and Eddy, G. W. (1957) Metabolism and excretion of 32P labelled diazinon in a cow. J. Agric. Food Chem., 5: 509-513
See Also: Toxicological Abbreviations Diazinon (EHC 198, 1998) Diazinon (ICSC) Diazinon (FAO Meeting Report PL/1965/10/1) Diazinon (FAO/PL:CP/15) Diazinon (FAO/PL:1967/M/11/1) Diazinon (AGP:1970/M/12/1) Diazinon (WHO Pesticide Residues Series 5) Diazinon (Pesticide residues in food: 1979 evaluations) Diazinon (Pesticide residues in food: 1993 evaluations Part II Toxicology) Diazinon (JMPR Evaluations 2001 Part II Toxicological)