城市地表水重金属污染特征及风险评价——以苏州市为例  

Characteristics and risk assessment of heavy metal pollution of urban surface water——A case study of Suzhou

作　　者：郑家传 王刚 ZHENG Jiachuan;WANG Gang(Suzhou HuanKe Environmental Technology Development,Suzhou 215123,China;High Technology Research Institute of Nanjing University(Suzhou),Suzhou 215123,China)

机构地区：[1]苏州市环科环保技术发展有限公司,江苏苏州215009 [2]南京大学(苏州)高新技术研究院,江苏苏州215123

出　　处：《环境保护科学》2022年第1期25-32,共8页Environmental Protection Science

基　　金：苏州市市级环保科技经费资金计划(B201904)。

摘　　要：为考察苏州市主城区地表水的重金属污染状况,选取18个采样点获得水样并分析了铬、镉、砷、铅、汞、铜和锌的浓度,在分析地表水重金属污染特征和评估其生态及健康风险的过程中,引入了地理空间系统分析和基于蒙特卡洛随机模拟系统的不确定性分析。结果表明:7种重金属浓度都低于渔业水质标准和饮用水水源标准限值,空间分布差异性较大,总体生态风险程度为轻微;重金属的非致癌风险低于有风险限值1E-06,致癌风险低于显著风险限值1E-04;生态风险和非致癌风险的模拟预测值的概率范围偏差较小,而致癌风险的预测结果有12%的概率大于1E-04。敏感性分析中铜、汞、砷和铬浓度的贡献值最高,体重对儿童健康风险的影响高于成人。Water samples were obtained at 18 sampling points and the concentrations of chromium, cadmium, arsenic, lead,mercury, copper and zinc were analyzed to evaluate the heavy metal pollution in Suzhou urban surface water. In the process of analyzing the characteristics of heavy metal pollution and assessing their ecological and health risks, GIS system and Monte-Carlo simulation were performed. Results showed that the contents of 7 heavy metals were all lower than the limit level of fisheries water quality standards and drinking water source standards. There was a great difference of the spatial distribution for each heavy metal.The ecological risk assessment indices were in the slightly-polluted range. The non-carcinogenic risk of heavy metals in Suzhou surface water was lower than the risk limit 1 E-06, and the carcinogenic risk was lower than the significant limit 1 E-04. The probability range deviation of simulated values of the ecological risk and non-carcinogenic risk was small, while the probability of significant carcinogenic risk was greater than 12%. The contribution value of Cu, Hg, As and Cr concentration was the highest in the sensibility analysis, and the body weight had a higher impact on children’s health risk than that of adults.

关 键 词：重金属 地表水 生态风险 健康风险 不确定性分析 

分 类 号：X824[环境科学与工程—环境工程]