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A comparison of electron capture gas liquid chromatography electrolytic conductivity gas liquid chromatography and uv absorption high pressure liquid chromatography for the analysis of some herbicides in foods



A comparison of electron capture gas liquid chromatography electrolytic conductivity gas liquid chromatography and uv absorption high pressure liquid chromatography for the analysis of some herbicides in foods



Journal of Chromatographic Science 14(12): 557-559



A comparison of gas chromatography with electron-capture or electrolytic-conductivity (N mode) detection, and high-pressure liquid chromatography (HPLC) with UV-absorption detection (254 nm) was carried out for the analysis of several herbicides in foods. Linuron, propanil, terbacil, benzoylprop-ethyl and the fungicide DCNA [2,6-dichloro-4-nitroaniline] in samples of cabbage, corn, potato and wheat spiked at 2 and 0.2 ppm were examined. The pesticides were extracted with acetone, partitioned into petroleum ether-methylene chloride, and cleaned up on a 2% deactivated Florisil column before direct chromatographic analysis. Electron-capture gas-liquid chromatography (GLC) was most suitable for DCNA and benzoylprop-ethyl while UV-absorption HPLC was best for terbacil analysis. Linuron and propanil gave similar results for both electron-capture GLC and HPLC. Electrolytic-conductivity GLC could detect all pesticides at the 0.2 ppm level and exhibited the least number of extraneous peaks in the chromatograms.

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Accession: 004561739

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