黄河中下游水体中多环芳烃的分布及来源

对小浪底至山东东明段黄河干、支流水、悬浮物和沉积物进行了采样分析.结果表明,干流水相∑15PAHs浓度范围为179～369ng/L,其中除焦巩桥外其它断面苯并(a)芘均超过国家饮用水标准;支流水相浓度均高于相应干流,尤其是富含低环PAHs的孟州一干渠对干流沉积相浓度有较大影响.与水相相比,悬浮、沉积相中PAHs检出种类较多,干流悬浮相∑13PAHs浓度范围为54～155μg/kg,且各环PAHs与悬浮相中TOC含量间存在一定正相关.干流沉积相∑13PAHs浓度范围为31～133μg/kg,其4、5、6环P

Pollution of Polycyclic Aromatic Hydrocarbons(PAHs) in Middle and Lower Reaches of the Yellow River

Samples of water, suspended particulate matter (SPM) and sediment in the Yellow River was analyzed. The total concentration of PAHs in the main river varies from 179 ng/L to 369 ng/L (sigma 15PAHs) in water, from 54 microg/kg to 155 microg/kg (sigma 13PAHs) in SPM dry weight, and from 31 microg/kg to 133 microg/kg (sigma 13PAHs) dry weight in sediment. The levels of PAHs in water of tributaries are higher than those in the corresponding sites in the main river, and concentrations of benzo(a)pyrene in most of the stations sampled are above drinking water standard. In SPM, PAHs of 3 to 6 benzene rings are mainly correlated to the content of total organic carbon (TOC) in different sites of the main river, while only 4 to 6 rings PAHs in sediment of main river are correlated to TOC for the influence of Mengzhou Canal, whose concentration of 3-ring PAHs are quite high. The distribution of PAHs in all media sampled in the main river indicates that PAHs are mainly transported from water into SPM between Mengzhou and Jiaogong Bridge, while in the reach between Jiaogong bridge and Huayuankou a great reduce of PAHs in SPM is mainly due to the diluting effect in the interchanging process between sediment and SPM. Source analysis also reveals that PAHs are mainly originating from coal burning, although in some tributaries PAH inputs could come from combustion of petroleum.