淮南多介质汞污染特征及风险评价

Characteristics and Risk Assessment of Multi-Media Mercury Pollution in Huainan

综合已发表文献研究成果,对安徽淮南16种不同介质中汞含量进行全面分析和风险评价。结果表明:煤矿开采和燃煤电厂对环境中汞污染有一定的影响,其中塌陷水体中平均汞含量1.847μg/L,远高于正常水体0.095μg/L;塌陷土壤汞浓度为0.027mg/kg,高于正常土壤0.019mg/kg;水体汞污染风险结果为该地区沉陷水体处于严重汞污染;地累积指数和潜在生态风险两种风险评价结果具有一致性,不同介质产生的生态风险等级由高到低为:PM2.5>PM10>脱硫石膏>飞灰>降尘>煤>煤矸石>土壤>底泥>粉煤灰>底灰,其中大气颗粒物PM2.5、PM10为严重污染;底泥、粉煤灰、底灰为轻微或无污染;非致癌健康风险评价结果为总非致癌风险熵HQ<1,暂未造成非致癌风险,但不排除有潜在的危害。

Based on the published literature research,a comprehensive analysis and risk assessment of the mercury content in 16 different media are carried out in Huainan,Anhui.The results show that:coal mining and coal-fired power plants have a certain impact on the mercury pollution in the environment,of which the average mercury content in the subsidence water bodies were 1.847 ug/L,much higher than the normal water bodies 0.095 ug/L;the concentrations of mercury insubsidence soil were 0.027 mg/kg,higher than the normal soil 0.019 mg/kg;the water body mercury pollution risk result is that the subsidence water body in the area is in serious mercurypollution;The results of the two cumulative risk assessments for the geo-accumulation index and potential ecological risk are consistent.The results of the ecological risk grades generated by different media from high to low are:PM2.5>PM10>desulfurized gypsum>fly ash>dust reduction>coal>gangue>soil>Bottom mud>Fly ash>Bottom ash;Among them,atmospheric particulate matter PM2.5 and PM10 are seriously polluted;bottom mud,fly ash and bottom ash are slightly or not polluted;The result of the non-carcinogenic health risk assessment is the total non-carcinogenic risk entropy HQ<1,which has not yet caused the non-carcinogenic risk,but does not rule out potential harm.In summary,there is a certain degree of mercury pollution in this area,which may cause greater harm to the ecosystem.