苏州市高新区北部地下水重金属污染特征及健康风险评价

以苏州市高新区北部区域地下水为研究对象,对区域内17个地下水监测点位进行采样,检测地下水样品中的pH以及砷、镉、铜、汞、铅、镍、六价铬的浓度值,利用单因子指数法和污染指数对检测结果进行评价,并采用风险评估模型进行健康风险评估。结果表明,研究区域内的地下水7种重金属平均含量均未超过Ⅲ类标准的限值,部分采样点存在重金属污染,但总体上污染程度较轻,且研究区域94.2%的地下水样品健康风险总值低于最大可接受值,对当地居民的健康的不利影响较小。

Pollution Characteristics and Health Risk Assessment of Heavy Metals in Groundwater in North of Suzhou High-tech Zone

Taking groundwater in northern area of Suzhou high-tech district as research object,sampling 17 groundwater monitoring points in the area to detect pH value and concentration of arsenic,cadmium,copper,mercury,lead,nickel,and hexavalent chromium in groundwater samples.Single element index method and pollution index are used to evaluate test results,and hazard assessment model is used to evaluate health danger.The results show that average content of seven kinds of heavy metals in groundwater in study area does not exceed the limit value of classⅢstandard.Some sampling points have heavy metal pollution,but the pollution degree is relatively light.94.2%of groundwater samples in study area have lower total health risk than the maximum acceptable value,which has little adverse impact on health of local residents.