Concentrations of porewater heavy metals, their benthic fluxes and the potential ecological risks in Daya Bay, South China. (January 2020)

• Record Type: Journal Article
• Authors: Zhang, Ling; Ni, Zhixin; Wu, Yunchao; Zhao, Chunyu; Liu, Songlin; Huang, Xiaoping
• Is Part Of: Marine pollution bulletin. Volume 150(2020)
• Publication Date: 2020-01
• Subjects: Heavy metal -- Porewater -- Flux -- Environmental impact -- Daya Bay; Marine pollution -- Periodicals; Marine Biology -- Periodicals; Water Pollution -- Periodicals; Mer -- Pollution -- Périodiques; Publications périodiques; Pollution des mers; Lutte antipollution; Electronic journals; 363.7394
• DOI: 10.1016/j.marpolbul.2019.110808
• Languages: English
• ISSNs: 0025-326X

Abstract

Abstract: Heavy metal (Cr, Mn, Fe, Ni, Cu, Zn, Cd, Pb) concentrations in surface sediment porewater and their benthic fluxes were investigated in Daya Bay, South China, to study their accumulation and transfer at the sediment-water interface, as well as the impact of human activities on heavy metals. Heavy metals in porewater displayed different patterns in three partitions (top, center and inlet), which was mainly attributed to the difference in the biogeochemical conditions, hydrodynamic force inner the bay and the human activities along the bay. Ecological risk assessment results showed that heavy metals in porewater dramatically exceeded the background values. The average release of heavy metals from sediment were (6.1 ± 3.3) × 10 4 –(2.7 ± 1.6) × 10 8 g a − 1 in the bay, so they had potential risks to the water environment, and sediment should be paid more attention to as the endogenesis of contamination. Highlights: Human activities and weak hydrodynamic force resulted in heavy metal accumulation. Most heavy metals in sediment had potential ecological risks to water environment. Total release of heavy metals from sediment to water column was 4.26 × 10 8 g each year. Sediment should be paid more attention to as the endogenesis of contamination.