大伙房水库3种邻苯二甲酸酯分布特征与风险评价

Distribution characteristics and risk assessment of three PAEs in Dahuofang Reservoir

大伙房水库作为辽宁省重要饮用水源地,库区水质安全具有举足轻重的作用。本研究对不同季节大伙房水库库区及主要入库河流中3种主要邻苯二甲酸酯(PAEs)的空间分布及季节变化特征进行了分析,并利用风险暴露模型对库区水体PAEs的风险特征进行了评估。结果表明,大伙房水库库区及入库河流流域中的PAEs含量均处于较低水平,在空间分布上库区中PAEs分布呈自东向西先增大后减小的趋势,在季节上具有夏季>春季>秋季的变化特点;主要入库河流中PAEs浓度呈自河流上游至下游逐渐增高的趋势,秋季河流水体中PAEs含量最少。在PAEs组分上,邻苯二甲酸二正丁酯(DBP)在所有采样点均有检出,DBP和邻苯二甲酸二异辛酯(DEHP)具有一定的同源性且与水中总氮、总磷浓度呈负相关。风险暴露模型结果表明,大伙房水库中DBP的非致癌风险指数均远小于1,不会对人体产生健康危害。

Dahuofang Reservoir is a major drinking water source in Liaoning Province,the water safety of which is important for this area.In this study,we collected water samples from the reservoir and three main inflow rivers and measured the contents of phthalic acid esters(PAEs).After that,we analyzed the spatial distribution and seasonal variation of PAEs.The results showed that the PAEs content in the reservoir area increased first and then decreased from east to west.In the three rivers,there was a gradual increase trend of PAEs content from upstream to downstream.The PAEs showed seasonal variation,with an order of summer>spring>autumn.Dibutyl phthalate(DBP)was detected in all sampling locations.DBP and di-2-ethylhexyl phthalate(DEHP)had a certain homology and were negatively related to the concentration of total nitrogen and total phosphorus in water.The results of risk exposure model showed that the non-carcinogenic risk index of DBP in Dahuofang Reservoir was far less than 1,which would not be harm to human body.