Abstract
To better understand the distribution and enantiomeric signature of chiral polychlorinated biphenyls (PCBs) in the soil, the concentrations and enantiomeric fractions of three typical chiral PCBs (PCBs 95, 132, and 149) in soil samples collected from Jinan, China, were determined by enantiomer-specific gas chromatographic analysis. The sum of the three chiral PCB congeners was between 22.0 and 695 ng kg−1 dry weight, and the mean enantiomeric fraction values for PCBs 95, 132, and 149 were 0.473±0.025, 0.355±0.146, and 0.527±0.167, respectively. The pollution distribution of PCBs in Jinan soil was source specific and exhibited a weak urban-rural gradient. An analysis of the correlation between soil organic matter and enantiomeric fraction deviations indicated that organic matter played an important role in the enantiomeric compositions of chiral PCBs in soil. Moreover, nonracemic PCBs 95, 132, and 149 occurred in 39%, 58%, and 80% of the Jinan soil samples, respectively, which suggested preferential degradations of the first eluting enantiomer of PCB 95 and (+)-PCB132, as well as either the (+) or (−)-PCB149 enantiomer.
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