广西岩溶区某地下河系统多种介质中多环芳烃的分布特征

为了研究岩溶地下河系统内多种介质中多环芳烃(PAHs)的浓度、组成和分布特征，以广西某典型岩溶地下河为例，利用2013-2014年同期的空气、地下河水、沉积物和土壤样品测试数据，对不同环境介质中16种多环芳烃(PAHs)的浓度、组成和分布特征进行对比分析。结果表明，空气和地下河水以2~3环PAHs为主，其中空气的2~3环PAHs比例为71.66%，地下河水的2~3环PAHs比例为54.84%；沉积物和土壤以4~6环PAHs为主，其中沉积物的4~6环PAHs比例为54.26%，土壤的4~6环PAHs比例为65.06%；环境介质中PAHs的浓度变化为：上游<中游<下游，这与污染源排放、吸附作用等相关；同一区域不同介质的2~3环PAHs百分比为：地下河水>沉积物>土壤，而4~6环PAHs百分比则相反。

Environment Characteristics of Polycyclic Aromatic Hydrocarbons in Multimedia in Underground Rivers of Guangxi Karst Areas

In order to understand the contamination characteristics of PAHs in different environmental media of karst underground river, the authors choose the underground river of Guangxi as a study object. Based on the data of air, groundwater, sediment and soil samples gathered during the same term from 2013 to 2014, contrastive analysis is done in light of the concentration, composition and distribution characteristics of 16 kinds of PAHs. The results show that PAHs with 2 to 3 rings are dominated in the air and underground river water, which accounts for 71.66% and 54.84% of the total PAHs. And PAHs with 4 to 6 rings are dominated in the soil and sediment of the underground river, which accounts for 54.26% and 65.06% of the total PAHs. The distribution of PAHs in environmental media along the underground river indicates that the mean concentration PAHs in upstream area is less than that of midstream, and that of midstream is less than that of downstream, because of pollution discharge and absorption. The percentage of variation of PAHs with 2 to 3 rings indicates that the percentage of the underground river is more than that of sediment which is more than that of soil, but the percentage of variation of PAHs with 4 to 6 rings is opposite.