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- Title
Migration and Transformation Characteristics of Heavy Metals in Sediments in the Drawdown Zone of Wanzhou Section of the Three Gorges Reservoir.
- Authors
ZHONG Yinhai; FU Chuan; PAN Jie; YAN Bin; WANG Jueqiao; WANG Huan; QU Yuyang
- Abstract
In order to deeply understand the current status and chemical behavior of heavy metal pollution in sediments in the drawdown zone of Wanzhou Section of the Three Gorges Reservoir, sediment samples were collected from six fixed sampling sites at different altitudes (150~155 m, 160~165 m, and 170~175 m) in June each year from 2018 to 2020, and sediment profiles samples (50 cm) were collected at an altitude of 150~155 m, with a profiled interval of 10 cm. Total amount of heavy metals (Cr, Cu, Pb, Zn) and the content of their occurrence forms were determined, to obtain the pollution characteristics and profile distribution characteristics of heavy metals, and analyze the ecological risks and biological effectiveness of heavy metals from the perspective of the occurrence forms in combination with the risk coding method. The results show that the content of heavy metals in the sediments of the drawdown zone generally increases with the decrease in altitude, that is, 170~ 175 m<160~165 m<150~155 m. The four heavy metals have obvious migration behavior in the drop zone. The maximum content of Cu and Cr migrates from 30~40 cm to 20~30 cm. The enrichment of Pb is the largest at 20~30 cm, and the pollution of Zn was the most serious at 40~50 cm. The heavy metal Cr in the sediments mainly exists in the form of residue; Cu has the highest occurrence of organic matter and sulfide combined state; Pb and Zn have a higher combined state of iron and manganese oxide. The results of the risk evaluation coding method indicate that Cr is in a risk-free or low-risk state from 2018 to 2020; the risk value of Cu and Pb is decreasing year by year; the risk value of Zn is increasing year by year, and zinc pollution must be paid attention to.
- Subjects
HEAVY metals; HEAVY metal toxicology; GORGES; SEDIMENTS; SEDIMENT sampling
- Publication
Environmental Science & Technology (10036504), 2021, Vol 44, Issue 12, p81
- ISSN
1003-6504
- Publication type
Article
- DOI
10.19672/j.cnki.1003-6504.1225.21.338