%0 Journal Article
%A LI  Xin-yue
%A YANG  Yan
%A HONG  Chang-hai
%A ZHI  Guo-qiang
%A YANG  Jian
%A HAN  Zhen-yang
%A WAN  Zheng-fen
%A LU  Shao-yong
%T Spatial and Temporal Distribution Characteristics of Heavy Metals in Surface Sediments of Niulan River (Kunming Section) and Potential Ecological Risk Assessment
%D 2024
%R 10.11988/ckyyb.20230632
%J Journal of Changjiang River Scientific Research Institute
%P 32-40
%V 41
%N 11
%X <p id="p00015">In order to explore the characteristics of heavy metal pollution in surface sediments of Niulan River (Kunming Section), the surface sediments of 20 points in the basin were collected ;and the contents of 8 metals (Cu, Zn, Cr, Cd, Ni, Pb, Hg and As) were determined in three water periods (wet period, dry period and normal period). Water stage and regional difference analysis, potential risk assessment and heavy metal source analysis were also carried out. The results showed that the content of Cd (1.45 mg/kg) and Hg (0.23 mg/kg) of heavy metals in sediments of Niulan River (Kunming Section) was 6.7 times and 4.0 times that of the background values 0.218 mg/kg and 0.058 mg/kg in Yunnan Province, respectively. It indicates that Cd and Hg pollution are relatively serious. The soil accumulation index showed that Cd had the highest pollution level in the three water periods of Niulan River (Kunming Section), followed by Hg. The average pollution levels reached moderate pollution and moderately moderate pollution, respectively. Therefore, Cd and Hg are the main ecological risk contributing factors of heavy metal pollution in surface sediments of Niulan River (Kunming Section). At the same time, the potential ecological risk coefficient showed that the distribution of potential ecological risk was higher in the main stream than in the tributaries, higher in the lower stream than in the upper stream and higher in the north than in the south.</p>
%U http://ckyyb.crsri.cn/EN/10.11988/ckyyb.20230632