江汉油田水环境中多环芳烃分布特征研究及风险评价

Study on Distribution Characteristics and Risk Assessment of PAHsin Water Environment of Jianghan Oilfield

为研究江汉油田河流水以及不同含水层地下水水体中多环芳烃(PAHs)污染状况,通过分析不同时期水质数据,对PAHs的污染水平、组成特征、来源、生态分析和饮水健康风险进行分析评估。结果表明,枯水期和丰水期地下水中16种PAHs的总浓度分别为ND^851.29 ng/L和83.6~385.0 ng/L,河流水的PAHs总浓度分别为ND^14.12 ng/L和0.74~4.43 ng/L,不同时期PAHs组成均以低环为主;丰水期∑PAHs浓度大于枯水期,是由于地表落地油随着降雨入渗至地下水和河流水中,且PAHs的理化性质影响其成分组成比例;分子比值法污染源解析表明,地下水中PAHs来源主要为石油制品;通过风险熵值法计算得到该区域河流水和地下水的生态风险相对较低;采用BaP致癌斜率的方法计算饮水健康风险的结果表明,研究区域内水体处于安全范围,且河流水的风险明显小于地下水。

In order to study PAHs pollution in rivers and groundwater in different aquifers in Jianghan Oilfield,the pollution level,spatial distribution,source,ecological analysis and drinking water health risk of PAHs were investigated and evaluated by collecting water quality data in different periods and using comparative analysis.Results show that the total concentrations of 16 kinds of PAHs in the groundwater of the study area in the low and high water periods ranged from ND^851.29 ng/L and 83.6~385.0 ng/L,and the total concentrations of PAHs in the rivers ranged from ND^14.12 ng/L and 0.74~4.43 ng/L,and the composition of PAHs in different periods was dominated by low rings;the reason why the concentration of∑PAHs in wet season is higher than that in dry season is that the surface oil infiltrates into groundwater and rivers with rainfall,and the physicochemical properties of∑PAHs affect the composition ratio;molecular ratio method pollution sources indicate that groundwater sources of PAHs in the main products for oil;through risk entropy method to calculate the region of rivers and groundwater ecological risk is relatively low;adopt the method of Bap carcinogenic slope calculation results show that the water body is within a safe range in research area,and the risk distribution of river water is obviously smaller than that of groundwater.