A gas chromatography-electron capture detector(GC-ECD)method was established to detect 18homologues of Cl/Br-PAHs in soils sampled from mangrove wetlands in Guangxi.The results indicate that a total Cl/Br-PAH content ranged from 163.24 to 244.45ng/g dw in wetland soils.The detection limits and spiked recovery rates were found to range from 0.21 to 3.75ng/g dry weight and from 64.9％to 106.4％,respectively.Compared to the GC-MS method,the GC-ECD method exhibited similar accuracy and sensitivity for most Cl/Br-PAHs and offered better stability and lower analytical costs.This method is thought to be suitable for both qualitative and quantitative analysis of Cl/Br-PAHs in wetland soils.
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