沋河水库周边地下水重金属含量及风险评价

Contents of heavy metals in groundwater surrounding Youhe Reservoir and the risk evaluation

鉴于沋河水库周边大部分住户仍以未经过任何处理的浅层地下水作为饮用水,为深入了解该区域的地下水环境质量并及时对村民的健康风险进行评价,于2016年3月底利用原子吸收光谱法(AAS)检测库区周边主要以地下水为饮用水的村镇的地下水中Zn、Cr、Pb、Mn、Cu含量。将检测结果运用水环境健康风险评价的方法对沋河水库周边地下水中重金属的健康风险作初步评价。结果表明:该区域地下水水质状况良好,所测地下水水样中重金属元素的含量远低于国家水质标准要求的极限值。经过地下饮用水路径所致的风险中,基因毒物质和躯体毒物质所引起的风险都远远低于国际标准值(5×10^(-5)a^(-1))。但是该地区土壤存在重金属污染,研究区地下水的潜在污染不容忽视。

Since most of the residents surrounding Youhe Reservoir still use untreated shallow groundwater as drinking water,the quality of the groundwater environment in this region need to be deeply understood and the risk for villagers＇ health should be evaluated in time. At the end of March 2016,Flame Atomic Absorption Spectrometry method was used to measure the amount of zinc,lead,chromium,manganese and copper in the groundwater surrounding the Youhe Reservoir. Preliminary evaluation was done for the risk of heavy metal poisoning by using health risk assessment model. The results indicated that the groundwater quality in the region was in good condition and the amount of heavy metal elements in the sample was well below the national water quality standard limits. Among the risks from the paths of the groundwater,the health risks of gene toxic substances and toxic substances caused by bodies were much lower than the international standard values.