IS 5863 : 1985 Method for determination of malathion residues in food commodities

1 Scope

1.1 This standard prescribes gas chromatographic (GLC) and spectrophotometric methods for the determination of malathion [S - (1, 2-dicarbethoxyethyl)-O, O-dimethyl dithiophosphate] residues in foods.

1.1.1 Spectrophotometric method may be adopted as a limit test for routine purposes and is generally applicable at a detection level of 0.2 �g/g (0.2 ppm), whereas gas chromatographic method shall be the referee method with a minimum detection limit of 0.05 �g/g (0.05 ppm).

1.1.2 Though no set procedure for thin layer chromatography (TLC) has been prescribed, any standardized thin layer chromatography procedure may be followed, if necessary, for the purpose of clean up, identification and confirmation of malathion residues.

2 References

IS 2 : 1960 Rules for rounding off numerical values

IS 1070 : 1977 Specification for water for general laboratory use

IS 11380 : Part 1 : 1985 Methods of sampling for the determination of pesticide residues : Part 1 Agricultural and food commodities