title: A comparison of electron-capture GLC, electrolytic-conductivity GLC and UV-absorption HPLC for the analysis of some herbicides in foods.
abstract: A comparison of gas chromatography with electron-capture or electrolytic-conductivity (nitrogen 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 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.
mesh_terms: D000814:Aniline Compounds / Q000032:analysis; D002849:Chromatography, Gas; D002851:Chromatography, High Pressure Liquid; D005504:Food Analysis / Q000379:methods*; D005659:Fungicides, Industrial / Q000032:analysis*; D006540:Herbicides / Q000032:analysis*; D008044:Linuron / Q000032:analysis; D011411:Propanil / Q000032:analysis; D014498:Uracil / Q000031:analogs & derivatives / Q000032:analysis
chemical_list: D000814:Aniline Compounds; D005659:Fungicides, Industrial; D006540:Herbicides; D008044:Linuron; D014498:Uracil; D011411:Propanil; C004354:dicloran; C011362:terbacil