白洋淀湿地表层沉积物多环芳烃的分布、来源及生态风险评价

Distribution,Sources and Ecological Risk Assessment of Polycyclic Aromatic Hydrocarbons in Sediments from BaiYangDian Wetland

对白洋淀湿地表层沉积物15种多环芳烃含量进行了检测，结果表明，其总含量范围为324．6～1738．5ng·g^-1，整体来看，白洋淀湿地多环芳烃污染处于中等偏低污染水平，多环芳烃组成主要以2～3环、4环为主，其含量分别占总含量的47．8％、28．6％，白洋淀湿地表层沉积物多环芳烃主要以化石燃料、木柴及生物质低温燃烧来源为主，个别样点受油类排放污染严重．风险评价表明，严重的多环芳烃生态风险在白洋淀湿地表层沉积物中不存在，但是在部分区域某些多环芳烃含量超过了效应区间低值（ERL），可能存在着对生物的潜在危害。

15 polycyclic aromatic hydrocarbons （PAHs） were measured in surface sediments from BaiYangDian wetland. The total PAH concentrations varied from 324.6 to 1738.5 ng·g^-1. In general, it was appeared to be moderate to low level pollution by PAHs in BaiYangDian wetland. The spectrum of PAHs showed that 2-3-ring and 4 ring PAHs were predominant, which accounted for 47.8%, 28.6% of the total, respectively. Biomass and coal combustion were the main sources of PAHs, and in some sites, petroleum PAHs had a high contribution to PAHs pollution. The result of ecological risk assessment indicated that high potential ecological risk of PAHs was not found in sediments of BaiYangDian wetland, but some of PAHs exceeded ERL in some regions, and potential harmful effects on creatures might exist.