Effects of cyanobacteria decomposition on the remobilization and ecological risk of heavy metals in Taihu Lake
| Autor: | Wang Yifei, Shiyin Li, Liu Xuanyu, Gu Guoxiu, Lixiao Ni, Dandan Li, Peifang Wang, Kumud Acharya, Rong Shiyi, Hu Lingling |
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| Rok vydání: | 2019 |
| Předmět: |
Cyanobacteria
China Geologic Sediments Health Toxicology and Mutagenesis 010501 environmental sciences Risk Assessment 01 natural sciences Algal bloom Sediment–water interface Metals Heavy Environmental Chemistry Ecotoxicology Organic matter 0105 earth and related environmental sciences Total organic carbon chemistry.chemical_classification Ecology biology Water Sediment General Medicine biology.organism_classification Pollution Decomposition Lakes chemistry Environmental chemistry Environmental science Environmental Pollution Water Pollutants Chemical |
| Zdroj: | Environmental Science and Pollution Research. 26:35860-35870 |
| ISSN: | 1614-7499 0944-1344 |
| DOI: | 10.1007/s11356-019-06649-y |
| Popis: | To investigate the relationship between cyanobacteria decomposition and the remobilization of heavy metals in Taihu Lake, the indoor simulation experiments were conducted. The areas of Taihu Lake that undergo harmful algal blooms mostly caused by excessive cyanobacteria have serious problems of heavy metal pollution. The results showed that cyanobacteria decomposition can release heavy metals into the water and change the total contents and chemical speciation of Cr, Ni, Cu, Zn, As, Cd, Hg, and Pb in sediment due to the change of physical and chemical properties in overlying water and sediment. The decomposition rate of cyanobacteria with sediment was clearly faster than that without sediment, and decomposition changed the pH and dissolved oxygen (DO) concentrations in overlying water. The cyanobacteria decomposition reduced the oxidation-reduction potential (ORP), and increased organic matter (OM) and total organic carbon (TOC) in the surface sediment. According to ecological risk assessment, the cyanobacteria decomposition increased the degree of heavy metal pollution and the potential ecological risk in sediment. |
| Databáze: | OpenAIRE |
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