Nutrients in overlying water affect the environmental behavior of heavy metals in coastal sediments
Liu, Xiaozhu1,2; Liu, Qunqun1; Sheng, Yanqing1
KeywordCoastal waters Sediments Nutrients Heavy metals
Corresponding AuthorSheng, Yanqing(
AbstractExcessive nutrients in aquatic ecosystems are the main driving factors for eutrophication and water quality deterioration. However, the influence of nutrients in overlying water on sediment heavy metals is not well understood. In this study, the effects of nitrate nitrogen (NO3-N) addition and phosphate addition in the overlying water on the environmental behaviors of chromium (Cr), copper (Cu), and cadmium (Cd) in coastal river sediments were investigated. Fresh estuary sediments and synthetic saltwater were used in microcosm studies conducted for 13 d. To determine the biological effect, unsterilized and sterilized treatments were considered. The results showed that the diffusion of Cr and Cu was inhibited in the unsterilized treatments with increased NO3-N. However, under the NO3-N sterilized treatments, Cr and Cu concentrations in the overlying water increased. This was mostly related to changes in the microbial regulation of dissolved organic carbon and pH in the unsterilized treatments. Further, in the unsterilized treatments, NO3-N addition considerably increased the concentrations of the acid-soluble (Cr, Cu, and Cd increased by 5%-8%, 29%-41%, and 31%-42%, respectively) and oxidizable (Cr, Cu, and Cd increased by 10%, 5%, and 14%, respectively) fractions. Additionally, compared with that in the unsterilized treatments, Cu and Cd concentrations in P-3 treatments decreased by 7% and 63%, respectively. By producing stable metal ions, microorganisms reduced the amount of unstable heavy metals in the sediment and heavy metal concentration in the overlying water, by considerably enhancing the binding ability of phosphate and heavy metal ions. This study provides a theoretical basis for investigating the coupling mechanisms between heavy metals and nutrients.
Funding OrganizationKey Project of Shandong Provincial Natural Science Foundation ; Strategic Priority Research Program of the Chinese Academy of Sciences
Indexed BySCI
WOS Research AreaEnvironmental Sciences & Ecology ; Public, Environmental & Occupational Health
WOS IDWOS:001081572600001
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Document Type期刊论文
Corresponding AuthorSheng, Yanqing
Affiliation1.Chinese Acad Sci, Yantai Inst Coastal Zone Res, CAS Key Lab Coastal Environm Proc & Ecol Remediat, Yantai, Peoples R China
2.Univ Chinese Acad Sci, Beijing, Peoples R China
Recommended Citation
GB/T 7714
Liu, Xiaozhu,Liu, Qunqun,Sheng, Yanqing. Nutrients in overlying water affect the environmental behavior of heavy metals in coastal sediments[J]. ENVIRONMENTAL RESEARCH,2023,238:9.
APA Liu, Xiaozhu,Liu, Qunqun,&Sheng, Yanqing.(2023).Nutrients in overlying water affect the environmental behavior of heavy metals in coastal sediments.ENVIRONMENTAL RESEARCH,238,9.
MLA Liu, Xiaozhu,et al."Nutrients in overlying water affect the environmental behavior of heavy metals in coastal sediments".ENVIRONMENTAL RESEARCH 238(2023):9.
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