摘要
为明确重庆青木关和老龙洞地下河流域地下水中多环芳烃(PAHs)的含量及其污染水平,全年共采集两流域地下河水样品84个,利用气相色谱质谱联用系统(GC-MS)分别测定了地下水中的16种PAHs含量,分析了PAHs在两条地下河流域中的空间分布特征,并应用物种敏感度分布法(species sensitivity distribution, SSD)评价了单体PAH生态风险和联合生态风险,分别应用浓度加和模型和效应加和模型计算了两条地下河流域水中单体PAH潜在影响比例(potential affected fractions, PAFs)及∑PAHs潜在累积影响比例(msPAF)。结果表明,青木关地下河水中∑PAHs浓度为73.8-480 ng/L,均值为224 ng/L,老龙洞地下河中∑PAHs浓度变化较大,为81.5-15 200 ng/L,均值为1 648 ng/L。应用效应加和模型计算出青木关地下河中∑PAH_(8)的msPAF_(RA)范围为0.145 9%-2.745 3%,均值为1.369 2%;老龙洞流域msPAF_(RA)范围为1.001 1%-2.866 5%,均值为1.774 7%,整体高于青木关地下河流域。单体PAH的PAFs在两条地下河流域均呈现Bap>Ant>Pyr>Fla>Flu>Ace>Phe>Nap的趋势,并且小于5%。两条地下河流域水体PAHs含量及生态风险均呈现入口大于出口的趋势,且生态风险的分布特征表明青木关和老龙洞地下河流域水生生态风险主要受BaP的影响,所以应避免工业及生活污水直接排入地下河以及直接饮食地下河水和生物。
To investigate the concentrations of polycyclic aromatic hydrocarbons(PAHs) in Qingmuguan(QMG) and Laolongdong(LLD) underground rivers, a total of 84 groundwater samples were collected all year round. 16 PAHs in different reaches of two underground rivers were measured by gas chromatograph-mass spectrometer(GC-MS), and the spatial distributions were analyzed. Based on the species sensitivity distribution(SSD) model, the ecological risk of individual and multiple congeners of PAHs were assessed. The potential affected fractions(PAFs) of PAHs and the potential affected fractions of total PAHs(msPAF_(RA)) were calculated by the concentration addition model and the response addition model. The results revealed that the total PAHs concentration in QMG underground river ranged from 73.8 to 480 ng/L, with a mean value of 224 ng/L, while ranged from 81.5 to 15 200 ng/L in LLD and with a mean value of 1 648 ng/L. The concentrations of PAHs in LLD were obviously higher than that in QMG. The msPAF_(RA) of ∑PAH_(8)in QMG ranged from 0.145 9% to 2.745 3%, with a mean value 1.369 2%, and the msPAF_(RA)of ∑PAH_(8)in LLD ranged from 1.001 1% to 2.866 5%, with a mean value 1.774 7%, which was higher than that in QMG. The PAFs in the two underground river catchments showed a trend of Bap>Ant>Pyr>Fla>Ace>Nap>Flu>Phe, and were less than 5%. The concentration level and ecological risks in the two underground river catchments show a trend of higher values in inflow than that of outflow, and the distribution characteristics of ecological risk indicates that the aquatic ecological risks in QMG and LLD underground river catchments were mainly affected by Bap, so, direct discharge of industrial and domestic sewage as well as direct consumption of groundwater and living things should be avoided.
作者
胡雨晴
孙玉川
李晓丽
曹敏
袁道先
HU Yuqing;SUN Yuchuan;LI Xiaoli;CAO Min;YUAN Daoxian(Chongqing Key Laboratory of Karst Environment,School of Geographical Sciences,Southwest University,Chongqing 400715,China;Key Laboratory of Karst Dynamics,Ministry of Natural Resources/Guangxi Zhuang Autonomous Region,Institute of Karst Geology,Chinese Academy of Geological Sciences,Guilin 541004,China)
出处
《地球与环境》
CAS
CSCD
北大核心
2021年第6期684-693,共10页
Earth and Environment
基金
中央高校基本科研业务费专项(XDJK2019B067、XDJK2020C013)
广西岩溶动力学重大科技创新基地开放课题项目(KDL&Guangxi 202012)。
关键词
多环芳烃
物种敏感度分布
潜在影响比例
生态风险
polycyclic aromatic hydrocarbons(PAHs)
species sensitivity distribution(SSD)
potential affected fractions(PAFs)
ecological risk
