• 责任者：Sun Yuchuan (Key Laboratory of Eco-Environments in Three Gorges Reservoir Region ; Ministry of Education ; School of Geographical Sciences ; Southwest University ; Chongqing 400715 ; China) ; Shen Licheng
• 刊名：Carsologica Sinica
• 出版年：2013
• 卷期：32(1)
• 关键词：岩溶泉 ; karst springs ; 多环芳烃 ; polycyclic aromatic hydrocarbons
• 页码：p.79-87
• 图表：illus., 3 tables, 35 refs.
• 分类号：1800
• issnNo：ISSN1001-4810
• isbnNo：CN45-1157/P

The concentration o[ 16 prior polycyclic aromatic hydrocarbons（PAHs） are measured by gas chro-  matography equipped with a mass spectrometry detector for samples collected from the overlaying soils of four typical epikarst springs that located in Nanchuan District, Chongqing City. The distribution, possible sources and contaminated level of the 16 PAHs are investigated. The detection ratios of the 16 PAHs are 100 ~ in all of the soil samples. The total concentration of the 16 PAHs in the soils range from 439.19 to 3 329.72 ng/gwith the mean value being 1 392. 44 ng/g. The PAH constituents are affected by altitude. With the increase of altitude, the percent of low molecular weight PAHs increase, but the percent of high molecular weight PAHs decrease. The isomer ratios reveal that PAHs in soils mainly come from the com- bustion of coal, biomass and petroleum. The TEQ of the 16 PAHs range from 18.65 to 501.13 ng/g, the mean value is 140.57 ng/g, and 96.8 ~ of which is contributed by 7 carcinogenic PAHs. Among the soils of the four epikarst spring, the level of PAHs contamination in HG epikarst spring soils is highest, and the contamination level of SF epikarst spring soils are lowest, but in BSW soils, the effect of pine needle litter fall should be taken into account.