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Effects of dissolved oxygen, salinity, nitrogen and phosphorus on the release of heavy metals from coastal sediments
Liu, Jin-Jun; Diao, Zeng-Hui; Xu, Xiang-Rong; Xie, Qun1,2
2019
Source PublicationSCIENCE OF THE TOTAL ENVIRONMENT
ISSN0048-9697
Volume666Pages:894
AbstractGreat 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 analysis suggested that higher metal bioavailability in sediments could facilitate the metal release, but the process could be restrained by the higher aqueous phosphorus due to the precipitation of metal phosphates. (C) 2019 Elsevier B.V. All rights reserved.
DepartmentLMB
KeywordDissolved oxygen Salinity Nutrients Heavy metals Release Sediment
DOI10.1016/j.scitotenv.2019.02.288
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Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.scsio.ac.cn/handle/344004/17844
Collection中科院海洋生物资源可持续利用重点实验室
Affiliation1.Chinese Acad Sci, Key Lab Trop Marine Bioresources & Ecol, Guangdong Prov Key Lab Appl Marine Biol, South China Sea Inst Oceanol,Inst South China Sea, Guangzhou 510301, Guangdong, Peoples R China
2.Guangdong Ocean Univ, Zhanjiang 524000, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Liu, Jin-Jun,Diao, Zeng-Hui,Xu, Xiang-Rong,et al. Effects of dissolved oxygen, salinity, nitrogen and phosphorus on the release of heavy metals from coastal sediments[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2019,666:894, 901.
APA Liu, Jin-Jun,Diao, Zeng-Hui,Xu, Xiang-Rong,&Xie, Qun.(2019).Effects of dissolved oxygen, salinity, nitrogen and phosphorus on the release of heavy metals from coastal sediments.SCIENCE OF THE TOTAL ENVIRONMENT,666,894.
MLA Liu, Jin-Jun,et al."Effects of dissolved oxygen, salinity, nitrogen and phosphorus on the release of heavy metals from coastal sediments".SCIENCE OF THE TOTAL ENVIRONMENT 666(2019):894.
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