Abstract
Abstract The security of water environment in the source region of the Yangtze River (SRYR) is vital to the water environment security of the whole basin. The results showed that the rivers in the SRYR were weakly alkaline and the values of total solid solubility (TDS), electrical conductivity (EC), turbidity concentration and salinity were higher than the values in the middle and lower reaches of the Yangtze River. The results showed that the dissolved trace elements detected displayed obvious regional distribution characteristics, showing a high concentration trend in the Chumar River, low in the Dangqu, and middle in the Tong River. All water quality indexes in the SRYR met the surface water environmental quality standard of class II based on GB 3838-2002 except Hg, while the average concentration of As exceeded 10 μg/L. The main enrichment elements in the SRYR were Li, Se, As and Pb, and their concentrations were far higher than the average concentration of the world rivers. Moreover, the HI and HQingrstion of children caused by As in the SRYR were greater than 1. This study could provide basic data for water environment protection and water resource management in the SRYR.
Highlights
The main enrichment elements in the source region of the Yangtze River (SRYR) were Li, Se, As and Pb, and their concentrations were far higher than the average concentration of the world rivers
It could be found that the Dangqu and Tongtian River were fresh water, the Tuotuo River was brackish water, and the Chumar River was moderately salty
The average value of electrical conductivity (EC) followed the order of Sr > Li > Ba > As > Cu > V > Zn > Se > Cr > Ni > Ti > Mo > Pb > Co > Sb > Hg > Cd, and the results indicated that the concentrations of Sr, Li, Ba and As were relatively high in the SRYR (Ding et al )
Summary
Trace elements can be absorbed by organisms in aquatic ecosystems through physical, chemical and biological cycling processes Trace elements are mainly derived from natural and human activities. Journal of Water and Climate Change | 12.6 | 2021 metal smelting and refining, agricultural runoff, industrial activities etc. Researchers have become increasingly concerned with the assessments of trace metals in the aqueous environment (Kavcar et al ; Wu et al ; Li & Zhang ; Li et al ; Kumar et al ; Zhang et al ; Gao et al )
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