广西钦州湾近岸表层沉积物多环芳烃分布特征及生态风险评价

对广西钦州近岸海域9个表层沉积物样品的多环芳烃（PAHs）含量进行分析,结果表明,研究区表层沉积物中PAHs总体含量介于1.9～44.7 ng/g,平均值为23.4 ng/g,与国内其他近岸区相比处于较低的含量水平,表明人类活动对区域环境的影响较小LMW/HMW（低分子质量/高分子质量）和异构体比值分析表明,广西钦州湾近岸表层沉积物中PAHls可能主要来源于石油热解-燃油污染.PAHs的生态风险评价结果显示,虽然沉积物中PAHs含量对生态环境的影响较低,但一些没有最低安全值的PAHs化合物（如苯并（b）荧蒽和苯并（k）荧蒽）的存在,也可能会对区域生态环境造成不利的影响.

Distributions and Risk Assessment of Polycyclic Aromatic Hydrocarbons (PAHs) in Surface Sediments from Qinzhou Bay,Guangxi

The analysis of PAHs in the surface sediment of 9 sampling sites from the Qinzhou Bay offshore area shows that total PAHs concentration ranged from 1.9-44.7 ng/g,with the average of 23.4 ng/g.Compared with the PHAs in offshore sediments from the other areas in China,the concentrations of PHAs in the study area is in lower level.The ratios of LWM/HWM （low-molecular-weight PAH/high-molecularweight PAH） and isomer suggestted that the fuel consumption is the mainly possible sources of PAHs.Risk assessment indicated that the sediments of Qinzhou-Beihai offshore area are in the low toxicological risk of PAHs.However,the amounts of BbF and BkF in the surface sediment,which had no minimum safety value,suggested the existence of negative ecological impact in the study area.