| Popis: |
A modification of the current Florisil chromatographic cleanup procedure for pesticide residue analysis is presented. By prewashing the Florisil column with a specified quantity of ethyl ether, many chlorinated pesticides, including dieldrin and endrin, can be eluted in one step. The demonstrated cleanup efficiency of the proposed method eliminates the need for further cleanup, since the concentrated eluate is suitable for gas chromatographic analysis. Recovery of 13 chlorinated pesticides in typical products of corn wet milling ranged from 85 to 115%. |
