Abstract
A comprehensive two dimensional gas chromatography coupled with micro-electron capture detector(GC×GC-μECD) method for the simultaneous analysis of 23 congeners of toxaphene in soil has been developed and validated.A DB-XLB column(20 m×0.25 mm×0.25 μm) was chosen as the column for the first dimension,and a BPX-50 column(2 m×0.1 mm×0.1 μm) was chosen as the column for the second dimension.The matrix-matched external standard calibration curves were used for quantitative analysis.The established method showed good linearity with correlation coefficients(r2) higher than 0.99 in the concentration range of 1-200 μg/L.Limits of detection ranged from 0.039 to 0.482μg/L for individual congeners.The relative standard deviations(RSD) of all 23 toxaphene congeners in matrix spiked samples were below 30%(n=5),and recoveries ranged from 55% to 115%.For validation,the developed method was applied to the determination of toxaphene in a soil sample.
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