MODIFICATION OF THE AOAC METHOD FOR DETERMINATION OF FUMIGANTS IN WHEAT

  • 1 January 1980
    • journal article
    • research article
    • Vol. 63  (3) , 539-545
Abstract
The official first action AOAC [Association of Official Analytical Chemists] method for determination of residues of fumigants in grains was modified for use by 6 laboratories in a Food and Drug Administration [USA] pesticide surveillance program. A 15% OV-17 GLC column, installed in a chromatograph equipped with a constant current 63Ni electron capture detector, provides for improved resolution, multiresidue capability, and lower limits of detection. A study was made of the behavior of CHCl3, CCl4, ethylene dichloride, trichloroethylene, tetrachloroethylene and ethylene dibromide through the method. Recoveries from fortified wheat samples averaged 105-115%. Experimental evidence is presented which suggests that part of the consistent trend toward high recovery can be attributed to selective sorption of acetone by the CaCl2 used in the final drying step.

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