骆马湖表层沉积物中多环芳烃的分布及风险评价

Distribution and Risk Assessment of Polycyclic Aromatic Hydrocarbons in Surface Sediments from Luoma Lake

采用高效液相色谱法(HPLC)定量检出骆马湖表层沉积物中16种优控多环芳烃(PAHs)的总量范围在189.13～725.94ng/g,平均值为443.02ng/g,属低-中等污染水平;沉积物中的PAHs主要来源于煤炭、木材及石油的不完全燃烧。利用沉积物质量基准法(SQGs)、沉积物质量标准法分别对骆马湖沉积物中PAHs的风险评价表明,严重的PAHs生态风险在骆马湖沉积物中不存在,负面生物毒性效应会偶尔发生,风险主要来源于低环的PAHs,以芴和二氢苊为主。

16 polycyclic aromatic hydrocarbons（PAHs）in the surface sediment from Luoma Lake were quantitatively determined by HPLC.The concentration of PAHs varied from 189.13 to 725.94 ng/g dry weight,with the average of 443.02 ng/g,which was at lower—moderate level compared with other lakes.The indices of source identification indicated the main source of PAHs in the samples was combustion source,which included coal,oil and wood inadequate combustion.The ecological risk of surface sediment in Luoma Lake was assessed with the methods of sediment quality guidelines（SQGs）and sediment quality standards（SQSs）.The results showed that the concentrations level of PAHs in the study area had not caused the marked negative influence on organism,but Flu and Ace compounds were present in excess of the lower ERL and may exist biological effects.The adverse biological toxicity effect might occasionally happen in Luoma Lake.