1.1 This standard prescribes gas chromatographic and spectrophotometric methods for the determination of DDT [2, 2-bis (ρ-chlorophenyI ) - 1, 1, l-trichloroethane and related isomers] residues in foods.
1.1.1 The gas chromatographic method determines residues of p,p' -DDT and related isomers such as p,p' -DDE [ 2,2-bis (p-chlorophenyl) 1-1-dichloroethylene ], p,p'-TDE [2,2-bis (p-chlorophenyl) 1,1-dichloro-ethane] and o,p-DDT [ 2 - (p-chlorophenyl) 2-( o-chloiophenyl )-1, 1, l-trichloroethane] in the range of 0·01 to 0·02 υg/g (0·01 to 0·02 ppm ), whereas the limit of detection with spectrophotometric method is 0·1 to 0·3 ng/g (0·1 to 0·3 ppm).
1.1.2 The procedures based on the use of alternate GLC column, thin layer chromatography and microalkali derivatization are also being prescribed for the confirmation of the nature of DDT residues.
IS 5864-1983 history
1983IS 5864-1983 Method for determination of DDT residues in food