AI Article Synopsis
- The study explored how gel permeation chromatography (GPC) can effectively separate organochlorine pesticides, pyrethroid pesticides, and PCBs from unpolished rice samples.
- A method was developed to quantify 35 different pesticides and PCBs using GPC followed by gas chromatography with electron capture detection.
- The results showed good recovery rates for different concentration levels, with detection limits as low as 0.07 micrograms per kilogram for organochlorines and PCBs.
Article Abstract
The separation behaviors of organochlorine pesticides, pyrethriod pesticides, polychlorinated biphenyl congeners (PCBs) and unpolished rice matrixes were systematically investigated with gel permeation chromatography (GPC) because of its outstanding capability in removing lipid and pigments from sample solutions. A separation method was proposed for the quantitative determination of 35 pesticides and PCBs in unpolished rice by GPC and gas chromatography simultaneously. Samples were extracted with ethyl acetate, purified by GPC, and then determined by gas chromatography and electron capture detection (GC-ECD). With external standard method, the recoveries of 3 standard addition levels of low, medium, high concentrations were 70.1% - 107.4%, 70.3% - 109.9%, 70.8% - 109.5%, respectively with relative standard deviations from 2.3% to 13.3%. The detection limits were 0.07 microg/kg for organochlorines and PCBs, and 0.44 microg/kg for pyrethriods.
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