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秦欢欢, 高 柏, 孙占学.西藏拉萨河重金属含量特征与健康风险评价水资源与水工程学报[J].,2022,33(4):1-7
西藏拉萨河重金属含量特征与健康风险评价
Concentration properties and health risk assessment of heavy metals in Lhasa River, Tibet
  
DOI:10.11705/j.issn.1672-643X.2022.04.01
中文关键词:  健康风险评价  重金属  化学致癌物  非致癌物  拉萨河
英文关键词:health risk assessment  heavy metal  chemical carcinogen  non carcinogen  Lhasa River
基金项目:江西省科技厅项目
作者单位
秦欢欢1,2, 高 柏2, 孙占学1,2 (1.东华理工大学 核资源与环境国家重点实验室 江西 南昌 3300132.东华理工大学 水资源与环境工程学院 江西 南昌 330013) 
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中文摘要:
      为了解拉萨河水中重金属含量,2017年7月对拉萨河中下游和堆龙曲支流16个采样点进行水样采集,测量As、Cd、Cu、Zn和Mn等5种重金属浓度,评价了这些重金属经饮水途径导致的人体健康风险。水样测试结果表明:研究区水体中5种重金属浓度大小为Zn>Mn>Cu>As>Cd,未超过《生活饮用水卫生标准》(GB 5749—2022)规定的限值,在水质上也符合Ⅰ和Ⅱ类标准(依据来自《地表水环境质量标准》(GB 3838—2002))。As、Cu和Mn高浓度主要分布在下游,而Zn高浓度主要分布在中游。健康风险评价结果表明:化学致癌物重金属的健康风险远大于非致癌物重金属,As是拉萨河水中主要的化学致癌物重金属,贡献了71.1%的致癌风险。拉萨河重金属经饮水途径导致的健康风险总体处于可接受的安全水平。对于相同的健康风险而言,儿童比成人更易受到影响,其承受的危害会更大,因而需要采取更严厉的监管措施来管理儿童饮水问题。
英文摘要:
      In order to investigate the content of heavy metals in Lhasa River, water samples were collected from 16 sampling points in the middle and lower reaches of Lhasa River and the Duilonqu Tributary in July 2017. The concentrations of five heavy metals (As, Cd, Cu, Zn and Mn) were measured and the human health risks caused by these heavy metals via drinking water were evaluated. The results show that the concentrations of these five heavy metals in the water of the study area are as follows: Zn>Mn>Cu>As>Cd, which do not exceed the limit values specified in the Standards for Drinking Water Quality (GB 5749—2022). Moreover, the water quality of the study area also meets class I and Ⅱ standards (according to the Environmental Quality Standards for Surface Water (GB 3838—2002)). The high concentrations of As, Cu and Mn are primarily distributed in the lower reaches of Lhasa River and those of Zn are in the middle reaches. The results of health risk assessment show that the health risk of chemical carcinogen heavy metals is much greater than that of non carcinogen heavy metals. As is the leading chemical carcinogen heavy metal in Lhasa River, contributing 71.1% of the carcinogenic risk. The health risks caused by heavy metals via drinking water ingestion in Lhasa River are generally at an acceptable safety level; however, children are more susceptible than adults to the same health risk, which poses a greater threat to their health. Therefore, stricter regulatory measures are needed to manage children’s drinking water problems.
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