【摘要】 为研究西南岩溶地区典型地下河沉积物中多环芳烃(PAHs)的污染特征,该文选择南宁市清水泉地下河进行分析,沿地下水流动方向共采集8个表层沉积物样品,并检测16种PAHs的含量。结果表明,地下河表层沉积物中∑PAHs浓度范围为257.71~609.29 ng/g,从PAHs组成来看,16种PAHs均被检出,且4环含量>5~6环含量>2~3环含量;空间分布规律呈下游含量>中游含量>上游含量的趋势,且2~3环PAHs的百分比先增大后降低,而4~6环PAHs的百分比变化则正相反;研究区的PAHs来源主要为煤炭和石油混合燃烧源(贡献率为62.90%)、石油源(贡献率为19.77%)、煤炭和天然气混合燃烧源(贡献率为8.54%)。更多还原

【Abstract】 In order to study the pollution characteristics of polycyclic aromatic hydrocarbons(PAHs) in surface sediments from typical underground river in southwest China, Qingshuiquan underground river in Nanning City was analyzed. A total of eight surface sediment samples were collected along the direction of groundwater flow, and composition of 16 priority PAHs were analyzed. The results showed that the total concentrations of PAHs ranged from 257.71~609.29 ng/g in sediment and sixteen PAHs were detected. The concentrations of 4 ring PAHs was the highest, followed by 5~6 rings PAHs, and 2~3 rings PAHs was the lowest. The spatial distribution law indicated that the downstream concentrations was higher than the midstream concentrations, and the midstream concentrations was greater than the upstream concentrations. From upstream to downstream, the percentage of 2~3 rings PAHs first increased and then decreased, while the percentage of 4~6 rings PAHs changed in the opposite direction. Source analysis showed that the source contributions were 62.90% from the mixed combustion source of coal and petroleum, 19.77% from petroleum source, and 8.54% from the mixed combustion sources of coal and natural gas.更多还原