Abstract
Natural substances derived from fragrant vegetables, such as parsley and onion, are known to disturb an analysis of the residual pesticides by a gas chromatography significantly.
It is suggested in the present study that those interfering substances can be eliminated effectively by silicagel column chromatography prior to application of gas chromatographic analysis.
The proposed procedure gave a fairly good detection of α-, β-and γ-BHC, heptachloroepoxide, dieldrin, pp′-DDE and pp′-DDT from the vegetables for domestic supply, in the chromatogram.
Good recovery of organochlorine pesticides was also obtained through the new combination of silicagel column and gas chromatography; the range of recovery was from 110 to 127% for α-BHC, 65-106, 110-130, 83-96, 101-104, 95-102, and 93-101 for β-BHC, γ-BHC, heptachlor epoxide, dieldrin, pp′-DDE, and pp′-DDT, respectively.
With these results, the possible application of the present method for practical purpose is discussed.
