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Spatial Distributions, Sources and Risk Assessment of Toxic Elements in Waters of a Central Asian Basin

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Abstract

We measured selected toxic element concentrations in surface water samples of the Ili-Balkhash Basin to obtain current contaminant levels. Fe, Cu, Zn, As and Pb were the most abundant toxic elements in basin waters, whereas Ni and Co were less abundant. Concentrations in water samples were generally within international water quality standards, with a few exceptions (high Cu, Pb and As in lake waters). These pollution hotspots were associated with the presence of industrial and domestic effluents, revealed by spatial distribution maps. Correlation and principal component analysis classified four pollutant groups and their sources, which were both natural and anthropogenic. Moreover, highly polluted waters at headwater areas were associated to atmospheric transport and deposition. The water quality indices denoted that river waters are suitable for irrigation and drinking, while lake waters demand remedial measures. A health risk assessment indicated that non-carcinogenic and carcinogenic risks in river waters were below threshold values, whereas lake water samples surpassed safe limits, and As was identified as a potential hazard, suggesting that consumption of lake water may cause adverse health effects in local inhabitants. Thus, regular monitoring and regulation, particularly of As in the lake, should be implemented.

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Data Availability

The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

We thank the CAS Research Center for Ecology and Environment of Central Asia for assistance with this work and Yuqing Wu for assistance with data processing. We also thank Mark Brenner for editorial help.

Funding

This study was supported by the National Natural Science Foundation of China (U2003202), the Strategic Priority Research Program of the Chinese Academy of Sciences, Pan-Third Pole Environment Study for a Green Silk Road (XDA2006030101).

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Conceptualization: Jinglu Wu; Methodology: Beibei Shen; Formal analysis and investigation: Beibei Shen, Jinglu Wu, Shuie Zhan, Miao Jin; Writing - original draft preparation: Beibei Shen; Writing - review and editing: Beibei Shen, Jinglu Wu, Shuie Zhan, Miao Jin; Funding acquisition: Jinglu Wu; Supervision: Jinglu Wu.

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Correspondence to Jinglu Wu.

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Shen, B., Wu, J., Zhan, S. et al. Spatial Distributions, Sources and Risk Assessment of Toxic Elements in Waters of a Central Asian Basin. Water Resour Manage 36, 6187–6203 (2022). https://doi.org/10.1007/s11269-022-03348-1

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