桂林会仙湿地土壤中多环芳烃分布特征与健康风险评价

Distribution characteristics and health risk assessment of polycyclic aromatic hydrocarbons in soil of Huixian wetland,Guilin

岩溶地貌由于其较薄的土壤层及高度发达的岩溶管道易导致污染物对地下环境产生威胁,因此有必要对岩溶区土壤即天然防护层中污染物水平与健康风险进行评价。以桂林会仙湿地土壤中16种优控多环芳烃(PAHs)为研究对象,分析了桂林会仙湿地冬夏两季不同土地利用类型土壤中PAHs组成特征,解析其来源,并基于蒙特卡罗模拟开展了健康风险评价。结果表明:桂林会仙湿地土壤中PAHs的含量范围为8.57~1407.21 ng/g,以4环PAHs为主,园地土壤中PAHs含量最低;采用主成分分析-多元线性回归(PCA-MLR)方法开展的PAHs来源解析结果显示研究区PAHs主要来源于机动车排放源;相关性分析结果显示,人类活动是研究区土壤中PAHs含量的主要影响因素;健康风险评价结果显示研究区土壤中PAHs对人体的潜在致癌风险可忽略。

Because of the thin soil layer and the highly developed karst pipeline in karst landform,the pollutant level and the health risk assessment of soil in karst area,as a natural protective layer,is worth studying.Taking 16 kinds of polycyclic aromatic hydrocarbons(PAHs)in the soil of Huixian wetland in Guilin as the research object,the content and composition characteristics of PAHs in soil of different land use types in Huixian wetland of Guilin in winter and summer were analyzed,their sources were analyzed,and the health risk assessment was carried out.The results show that the content of PAHs in the soil ranges from 8.57 ng/g to 1407.21 ng/g,mainly in the fourth ring road,and the content of PAHs in the garden soil is the lowest.The principle component analysis-multiple linear regression(PCA-MLR)source analysis results show that the PAHs in the study area are mainly from vehicle emission sources.The correlation analysis shows that human activities are the main influencing factor of the content of PAHs in the soil of the study area.Health risk assessment was carried out based on Monte Carlo simulation,and the results show that the potential carcinogenic risk of PAHs in soil is negligible.