Factors controlling the accumulation and ecological risk of trace metal(loid)s in river sediments in agricultural field
| Autor: | Feipeng Li, Libo Liu, Hua Ye, Haifeng Wen, Hong Tao, Lingchen Mao, Nanxia Yan |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
China
Geologic Sediments Environmental Engineering Health Toxicology and Mutagenesis 0208 environmental biotechnology 02 engineering and technology Fractionation 010501 environmental sciences Chemical Fractionation 01 natural sciences Risk Assessment Metal Rivers Metals Heavy Environmental Chemistry Ecological risk Trace metal Organic matter 0105 earth and related environmental sciences chemistry.chemical_classification Ecology Chemistry business.industry Extraction (chemistry) Public Health Environmental and Occupational Health Sediment Agriculture General Medicine General Chemistry Pollution 020801 environmental engineering Trace Elements visual_art Environmental chemistry visual_art.visual_art_medium business Water Pollutants Chemical Environmental Monitoring |
| Zdroj: | Chemosphere. 243 |
| ISSN: | 1879-1298 |
| Popis: | There is an increasing concern of ecological risk from toxic trace metals in sediments to aquatic environment in agricultural field. However, the knowledge of factors that control the accumulation and risk of trace metals in such environment is limited. In this study, we conducted source apportionment of 9 trace metal(loid)s in river sediments on Chongming Islands, China, where there had been >120 years of agricultural practice. The influence from sediment properties on metal accumulation and mobility were also discussed. The results indicate that anthropogenic metal input generally elevated Cd, Sb, Pb and Zn concentrations as their average values were 3.3, 2.6, 1.6 and 1.6 times of the background respectively. Significantly high As (max = 28.2 mg/kg) and Cu (max = 145.6 mg/kg) were also found in some individual sites. Positive matrix factorization analysis suggests that atmospheric deposition contributed 53.5% and 54.7% of the total Sb and Pb respectively, while most anthropogenic Cd, Cu, As and Zn was agriculture-derived. Amorphous Fe, Mn and Al oxides and organic matter were the most important binding phases which favour trace metal accumulation. Fractionation information from BCR sequential extraction suggests high potential mobility of Cd (>37% in acid extractable fraction). Fe/Mn oxides bound As, Cd, Cu, Pb and Zn (reducible fraction), which comprised 15–26% of the total, increased the ecological risk in anoxic sediments. The potential ecological risk index and risk assessment code identified more than 74% of the sampling sites as high to extremely high ecological risk because of the high toxicity and mobility of Cd. |
| Databáze: | OpenAIRE |
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