Water Environment Evolution and Heavy Metal Pollution Assessment in the Water-Receiving Area after Water Transfer
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Abstract:
The mixture dilution experiment of Weihe River water and incoming water was performed to simulate the water environment evolution in the water receiving area after water transfer and to assess the pollution characteristics of heavy metals in the water environment and the potential ecological risk. The results showed that (1) the contents of Co, Cr, Mn, Mo, Pb, and V in the mixed water of Weihe River of the Weinan and Xianyang sections decrease with the increasing volume of incoming water due to the impacts of the interactions among pH, TDS, and heavy metals, and water quality of the mixed water improves; (2) the comprehensive pollution index of heavy metal (Nemoro P综合) of the mixed water reduces by about 60% in average due to mixture dilution, and the pollution degree of heavy metals decreases significantly; and (3) the potential ecological risk coefficient of single heavy metal and potential ecological risk index RI in the water environment of the water-receiving area after water transfer reduce apparently. The average decline rates of the potential ecological risk coefficients of Cr, Mn, and Pb are 50%, 70%, and 56% respectively, and the average decline rate of the potential ecological hazard index RI is 57%, which indicates that the mixture dilution can decrease the potential ecological risk of heavy metals significantly.
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