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  • Title: [Determination of 23 organochlorine pesticides in soil and sediment by gas chromatography coupled with dual columns and dual electron capture detectors].
    Author: Zhu H, Liu W, Ding X, Zhao Y.
    Journal: Se Pu; 2011 Aug; 29(8):773-80. PubMed ID: 22128742.
    Abstract:
    Gas chromatography (GC) coupled with dual columns and dual electron capture detectors (ECD) was established to determine 23 organochlorine pesticides in 5 soil and 5 sediment samples. Microwave assisted extraction and solid phase extraction with a Florisil column and sulfur cleanup with copper powder were used in sample pre-processing. Chromatographic analysis was performed on DB-XLB and DB-1701 capillary columns by internal standard method. This method showed good extraction efficiency, high sensitivity and good reproducibility. In the same linear range of 0.005 - 0.5 mg/L of 23 pesticides, the correlation coefficients were higher than 0.997. The average spiked recoveries were 50% - 119% with the relative standard deviations (RSDs) of 0.9% - 16.1% (n = 6) in 5 soil samples, and were 52% - 120% with RSDs of 0.3% - 28.4% ( n = 6) in 5 sediment samples, respectively. The detection limits were 0.000 05 -0.000 5 mg/kg. The results indicate that this method is suitable for the determination of the 23 organochlorine pesticides in soil and sediment samples.
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