Abstract
The systematic identification and determination of many kinds of pesticides are attempted by a combination of column, thin-layer and gas chromatography. About one hundred pesticides were classified into six divisions and twenty two groups by thin-layer chromatography (tlc). In order to apply this systematic method of separation to the determination of pesticide residue in crops or soils, etc., the authors try to divide the pesticides into six fractions corresponding to the above divisions by column chromatography instead of tlc. Here, twelve pesticides in the Fifth were eluted from a column. That is, linuron, CPMC, and ACN were eluted into fractions III and IV, while MPMC, MTMC, simazine, propoxur, diphenamid, carbaryl, propanil, and dimethachlone were into fractions IV and V; chlorthiamid was mostly into fraction VI. These pesticides were separated from each other and determined by GC with ECD and FID, after being divided into three groups by thin-layer chromatography (tlc). Most of these pesticides were recovered more than 80%. Sixteen pesticides in the Sixth also were separated from each other and determined in the same procedure as described above. The majority of these pesticides were recovered over 75% through the whole procedure. Furthermore, the method for the systematic separation and identification of pesticides in the First to the Sixth is arranged in the schematic diagram.
