Effects of dissolved oxygen, salinity, nitrogen and phosphorus on the release of heavy metals from coastal sediments

The Science of the Total Environment
Jin-Jun LiuQun Xie

Abstract

Great amounts of nutrients discharged into the urbanized coastal areas, which are continuously subject to violently anthropogenic metal contamination, will result in eutrophication and hypoxic episode. In order to study the effects of dissolved oxygen (DO), salinity, nitrogen and phosphorus on the release of six metals including Zn, Pb, Cd, Cu, As and Cr from coastal sediments, a series of 60-days microcosm experiments consisting of sediments and seawater were conducted. Severe hypoxia could result in the enhanced peak values of Pb, Cd, Cu and Cr concentrations in the overlying water. A higher level of water salinity could elevate the peak value of As concentration in water column, and a higher level of nitrogen could increase the peak value of Zn concentration in water. The exchange fluxes demonstrated that the diffusion from the sediments was a dominant process during the first 10 days, However, a relative equilibrium of adsorption and precipitation in the sediment-water interface reached during the later periods. In addition, the bioavailability of the studied metals in sediments was elevated under severe hypoxia, or a high level of water salinity, or high levels of nitrogen and phosphorus. The results of linear regression a...Continue Reading

Citations

Sep 25, 2020·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Zhipeng LinQian Wang
Jan 28, 2021·The Science of the Total Environment·Lorena S MirandaAshantha Goonetilleke
Jul 7, 2021·Water Research·Lorena S MirandaAshantha Goonetilleke
Aug 8, 2021·Environmental Science and Pollution Research International·Xuecheng ZhangXiao-Dong Li
Oct 9, 2021·Environmental Monitoring and Assessment·Lestari LestariA'an Johan Wahyudi
Jan 4, 2022·Environmental Science and Pollution Research International·Xunan LiBing Xie

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