Subjects: Geosciences >> Other Disciplines of Geosciences submitted time 2022-09-26 Cooperative journals: 《干旱区研究》
Abstract： Typical urban rivers in Xi’an (Ba River, Chan River, Feng River, and Hei River) were selected as the research object to understand the impact of different land-use types on the distribution of heavy metals in river sediments. The spatial distribution, environmental risks, and sources of heavy metals (Cr, Mn, Ni, Cu, Zn, Cd, and As) in river sediments were analyzed and evaluated using potential ecological risk (RI), pollution load index (PLI), correlation analysis, and principal component analysis. Results showed that the content of heavy metals in the sediments of the four rivers was presented in the following order: Chan River > Ba River > Hei River > Feng River. The RI results showed that Cd remarkably contributed to the pollution, and the four rivers were all at moderate potential ecological risk. The PLI results showed that the H1 sample site in Hei River was moderately polluted, which was the highest. The RI and PLI results showed that the sample sites in the Chan River were the most polluted, and they were concentrated in the middle and lower reaches where the proportion of artificial ground and intensity of human activities were high. In addition, the results of correlation analysis and principal component analysis showed that most heavy metals came from human activities such as emissions from industrial and agricultural production and traffic pollution. Therefore, attention should be paid to the prevention and control of Cd pollution, particularly in the middle reaches of Feng River and Hei River, to prevent further pollution.
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