IS 5864 : 1983 Method for Determination of DDT Residues in Food Commodities

1 Scope

1.1 This standard prescribes gas chromatographic andspectrophotometric methods for the determination of DDT [2, 2-bis(p-chlorophenyl) -1, 1, 1-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-DDE [2,2-bis(p-chlorophenyl) 1,l-dichloro- ethane] and o,p-DDT[2-(p-chlorophenyl) 2-(o-chlorophenyl) -1, 1, 1-trichloroethane] inthe range of 0.01 to 0.02 �g,g (0.01 to 0.02 ppm),whereas the limit of detection with spectrophotometric method is0.1 to 0.3 �g/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 alsobeing prescribed for the confirmation of the nature of DDTresidues.

2 References

IS 2 :1960TRules for rounding off numerical values

IS 5864 : Part 1 : 1970 Method for determination ofDDT residues:Part 1 Foodgrains and their milled products