祁连山煤炭基地地下水质量及健康风险评价

Groundwater Quality and the Health Risk Assessment of Qilian Mountains Large Coal Base

采集了祁连山大型煤炭基地91个地下水样品,利用单指标综合评价方法研究了地下水的质量状况,进行了饮水暴露途径的健康风险评价。水质评价结果表明:浅层地下水中COD、硫酸盐、铁,深层地下水中硫酸盐、总硬度均超出Ⅲ类水指标,贡献率超过15%,且浅层地下水质劣于深层地下水。健康风险评价结果表明:深层地下水健康风险值高于浅层地下水。致癌化学指标中,砷的健康风险值最大,为首要的环境健康风险管控指标。非致癌化学指标中氟化物的健康风险最大。评价结果可为该区地下水资源合理利用和保护提供参考。

91 groundwater samples collected from Qilian Mountains large coal base were analyzed. The current status of groundwater quality was evaluated by the single factor comprehensive index. Human health risk was given via exposure pathway of drinking water. The results showed that the total contribution rates of COD, sulfate, iron in shallow groundwater and sulfate, total hardness in deep groundwater were more than 15% based on standard for groundwater quality. Shallow groundwater quality was worse than deep groundwater. Health risk assessment indicated that deep groundwater (except nitrate and nitrite) have higher health risk than that of shallow. Arsenic had the highest health risk among the carcinogenic chemicals, which was the primary environmental health risk management control pollutant in the study regions. Fluoride had the highest health risk among the non-carcinogenic chemicals. The evaluation results could provide references for exploitation and protection of groundwater resources in the regions.