Evaluation of Electrolytic Conductivity Detection for the Gas Chromatographic Analysis of Six Polar Organonitrogen Herbicides

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Abstract
The Coulson electrolytic conductivity detector (nitrogen mode) was evaluated for the detection in foods of 6 polar organonitrogen herbicides containing phenolic or carboxylic moieties. The herbicides were extracted from the crop materials with acetone and partitioned between water and dichloromethane/hexane (1:1). The organic extract was reduced in volume and treated with ethereal diazomethane. The methylated products were then cleaned up on a 2% deactivated Florisil column and analyzed by gas chromatography. Detection limits ranged from 0.01-0.1 ppm depending upon type of crop and herbicide. The extraction procedure evidently removed 40-90% of added herbicide from the foods at 0.1 and 1.0 ppm.