Effects of water impoundment and water-level manipulation on the bioaccumulation pattern, trophic transfer and health risk of heavy metals in the food web of Three Gorges Reservoir (China)

Chemosphere ◽  
2019 ◽  
Vol 232 ◽  
pp. 403-414 ◽  
Author(s):  
Chong Sang ◽  
Yuanyuan Zheng ◽  
Qiong Zhou ◽  
Dapeng Li ◽  
Gaodao Liang ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Health Risk ◽  
Food Web ◽  
Water Level ◽  
Three Gorges Reservoir ◽  
Trophic Transfer ◽  
Three Gorges ◽  
Bioaccumulation Pattern ◽  
Water Impoundment

scholarly journals Migration and Transformation of Heavy Metals in the Soil of the Water-Level Fluctuation Zone in the Three Gorges Reservoir under Simulated Nitrogen Deposition

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Liuyi Zhang ◽  
Kun Fu ◽  
Fumo Yang ◽  
Yang Chen ◽  
Chuan Fu ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Diffusion Equation ◽  
Water Level ◽  
Three Gorges Reservoir ◽  
N Deposition ◽  
Level Fluctuation ◽  
Three Gorges ◽  
The Three Gorges Reservoir ◽  
The Three Gorges ◽  
Water Level Fluctuation Zone

The accumulation of heavy metals (HMs) in the water-level fluctuation zone (WLFZ) of the Three Gorges Reservoir (TGR) area is potentially harmful to the water environment. In order to reveal whether nitrogen (N) deposition is a potential driving factor for the migration and transformation of HMs (Cd, Cr, Cu, Ni, and Pb), a simulated N deposition experiment was performed on the soil in the WFLZ of the TGR. The results showed that the accumulative release amounts of HMs increased with the increase of N deposition. It was found that the Elovich equation, double-constant equation, and parabolic diffusion equation could well describe the release process of Cu, Cd, Cr, and Ni, while the double-constant equation, parabolic diffusion equation, and first-order equation could be applicable for Pb. The exchangeable fractions of HMs increased to varying degrees after the N deposition treatment, wherein Ni was most significant, indicating that N deposition could increase the ecological risk of HM pollution in the TGR area. The results provide insight into the major factors affecting the release of different HMs under N deposition in this vulnerable region ecologically.

Sign in / Sign up

Export Citation Format

Share Document