Spatial Distribution, Speciation, and Ecological Risk Assessment of Heavy Metals in Surface Sediments of Dongjiang Lake, Hunan Province

被引：0

作者：

Zhang T.-L. ^{[1
,2
]}

Yi L.-X. ^{[1
]}

Li C.-C. ^{[3
]}

Yuan S.-S. ^{[4
]}

Dou Y.-X. ^{[5
]}

Tian S.-Y. ^{[1
]}

Lin K.-X. ^{[2
]}

机构：

[1] Tianjin Marine Environmental Protection and Restoration Technology Engineering Center, Key Laboratory of Marine Resources Chemistry and Food Technology, Ministry of Education, College of Marine and Environmental Sciences, Tianjin University of Science and

[2] State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing

[3] Chenzhou Ecological and Environmental Monitoring Center, Chenzhou

[4] Chenzhou Dongjiang Lake Water Environment Protection Bureau, Chenzhou

[5] Chenzhou Municipal Ecology and Environment Bureau, Chenzhou

来源：

Huanjing Kexue/Environmental Science | 2023年 / 44卷 / 09期

关键词：

Dongjiang Lake; ecological risk; heavy metal; sediment; speciation;

D O I：

10.13227/j.hjkx.202209060

中图分类号：

学科分类号：

摘要：

To understand the heavy metal pollution status of Dongjiang Lake, the contents and species of heavy metals in the surface sediments were investigated during September 2021, and the heavy metal pollution level and potential ecological risk were evaluated. The results showed that Cd, Pb, As, Cu, Zn, Ni, and Cr contents were in the range of 0. 40-34. 1, 14. 8-1 688, 6. 99-1 155, 6. 89-280, 26. 2-1 739, 6. 29-55. 4, and 23. 3-44. 8 mg·kg - 1 , respectively, with extremely uneven spatial distributions. The highest contents of Cd, Pb, As, Zn, Cu, and Ni were found in the site adjacent to Yaogangxian tungsten ore. The proportion of metal species with bioavailability was high, in which Cd in acid-soluble species was 46. 7%-71. 5% and Pb in reducible species was 46. 8%-67. 0%. The bioavailable species of Cu, Zn, Ni, and Cr were 35%-68%, 42%-72%, 26%-51%, and 6%-30%, respectively, although they primarily existed in residual species. According to the geo-accumulation index (Igeo ), there was a moderate or extreme pollution status of Cd in all sites, moderate or extreme pollution status of Pb in 90% of sites, and moderate pollution status of As, Cu, and Zn in 30% of sites. The ecological risk factor (Eir ) of Cd showed high potential ecological risk in all sites with significantly high potential ecological risk in 80% of sites. Moreover, As and Pb had significantly high potential ecological risk, and Cu had moderate potential ecological risk in S7, which was adjacent to Yaogangxian tungsten ore. There was a high total potential ecological risk in all sites and significantly high potential ecological risk in 50% of sites. Therefore, the surface sediments of Dongjiang Lake were under the combined pollution of Cd, Pb, As, Zn, and Cu with high bioavailability and high total potential ecological risk. © 2023 Science Press. All rights reserved.

引用

页码：4898 / 4905

页数：7

共 45 条

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