长江干流滨江水体As空间梯度变化与健康风险评价

重金属污染是世界各国河流面临的重要问题。长江是中国第一大河流,其在提供水资源、调蓄洪水及维持生态平衡等方面发挥重要作用。因此,有必要对其重金属污染状况进行研究。As是重要的致癌重金属,也是长江水体重要污染物之一。沿长江从上游至下游取水样,对长江滨江水体As空间梯度变化进行研究,并评价其健康风险。结果显示:As浓度整体呈从上游至下游增加的趋势。与已有研究比较显示,长江As浓度呈减小趋势。但As在一些点位(如芜湖市、池州市、东至县、常州、无锡、崇明岛等地区点位)存在较大致癌风险,需要引起特别关注。水体温度、离子浓度可能是影响水体As毒性的重要因子。研究结果可为长江水环境污染治理与保护提供基本依据。

Spatial Distribution and Health Risk Assessment of Dissolved As in Yangtze River

Heavy metal pollution has been a serious problem facing rivers worldwide because of its persistence, toxicity and bioaccumulation. As the largest river in China, Yangtze River plays an important role in providing water, mitigating flood, and maintaining ecological balance. Therefore, it is of great importance to study its metal pollution status. As is a carcinogenic heavy metal and one of the most important pollutants in the Yangtze River. In this study the spatial distribution and health risk of As in riverside water of Yangtze River were assessed. The results showed that As concentration increased from upstream to downstream generally. The comparison with existing studies indicated that As concentration in Yangtze River showed a decreasing trend. However, special attention should be paid to sites(such as sites of 52, 43, 42, 51, 78, 81) where As showed high cancer risk. Water temperature and ion concentration may be important factors affecting As toxicity. This study provides a basis for the treatment and protection of water environmental pollution in Yangtze River.