A nationwide investigation on the characteristics and health risk of trace elements in surface water across China

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作者
Meng, Fanyu [1 ,2 ]
Cao, Rong [2 ]
Zhu, Xiuhua [1 ]
Zhang, Yuying [3 ]
Liu, Manxue [1 ,2 ]
Wang, Jufang [1 ,2 ]
Chen, Jiping [2 ]
Geng, Ningbo [2 ]
机构
[1] School of Environmental and Chemical Engineering, Dalian Jiaotong University, Dalian,116028, China
[2] CAS Key Laboratory of Separation Sciences for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian,116023, China
[3] Institute of Advanced Technology of Heilongjiang Academy of Science, China
基金
中国国家自然科学基金;
关键词
Aquatic ecosystems - Chromium - Geographical distribution - Heavy metals - Information management - Potable water - Surface waters - Trace elements - Water quality;
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学科分类号
摘要
Rapid urbanization accelerates the release of anthropogenic heavy metals from local to wider water systems, posing a serious threat to aquatic ecosystems and public health. The characteristics of trace elements were investigated to evaluate the environmental status of surface water in 40 cities of China. The concentrations of 22 elements in surface water ranged from 7.00 × 10−4 to 4.37 × 105 μg/L. The water quality can be classified as excellent except Songhuajiang. The levels of As, Cd, Cr, Pb, and Hg are all within the limits permitted by national drinking water quality standards. An obvious regional distribution characteristic was observed, with concentrations of Zn, Mn, Ni, Cu, Co, U, and Cr higher in surface water collected in the north than in the south, while the trends for Cd, Tl, and As are opposite. Notably, Tl shows significant geographical divergences, with the level of surface water collected from the south nine times higher than that from the north. The regional distribution of the mineral, industrial, or agricultural activity might be responsible for the south-to-north difference of these elements. The hazard index (HI) and total cancer risk (TCR) through oral or dermal contact with water-related heavy metals were further calculated. The average HI was 0.54 in the north and 0.29 in the south for adults, while HI for children was relatively higher. The value was 1.01 and 0.55 in the north and south, respectively. TCR in the north is 2.58 × 10−4 and mainly contributed by Cr (88.1 %), while TCR in the south is 4.48 × 10−5 and mainly contributed by As (98.4 %). The research results can provide essential data for effective water resources management and human health protection in China. © 2023
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