Effects of freshwater leaching on potential bioavailability of heavy metals in tidal flat soils

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• 作者：Hui Li ; Jun Lu ; Qu-Sheng Li ; Bao-Yan He…
• 关键词：Acid ; volatile sulfide ; Heavy metal ; Salinity ; Leaching ; Reclamation ; Tidal sediment
• 刊名：Environmental Geochemistry and Health
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：38
• 期：1
• 页码：99-110
• 全文大小：743 KB
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• 作者单位：Hui Li (1) (2) (3)
  Jun Lu (1) (2)
  Qu-Sheng Li (1) (2)
  Bao-Yan He (1) (2)
  Xiu-Qin Mei (1) (2)
  Dan-Ping Yu (1) (2)
  Zhi-Min Xu (1) (2)
  Shi-Hong Guo (1) (2)
  Hui-Jun Chen (1) (2)
  
  1. School of Environment, Jinan University, Guangzhou, 510632, China
  2. Key Laboratory of Water/Soil Toxic Pollutants Control and Bioremediation, Department of Education of Guangdong Province, Guangzhou, 510632, China
  3. Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology (Sun Yat-sen University), Guangzhou, 510632, China
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Geochemistry
  Atmospheric Protection, Air Quality Control and Air Pollution
  Public Health
  
• 出版者：Springer Netherlands
• ISSN：1573-2983

文摘

Leaching experiments were conducted to investigate the effects of desalination levels and sediment depths on potential bioavailability of heavy metal (Cd, Cr, Cu, Fe, Mn, Ni, Pb, and Zn) in tidal flat soils. The data showed that both the desalination levels (p < 0.001) and soil depths (p < 0.001) had significant effects on the concentrations of acid-volatile sulfide (AVS). AVS concentrations generally exhibited increasing trends with an increase in depth and decreasing trends with enhanced desalination levels. The desalination levels had significant (p < 0.05) effects on the concentrations of simultaneously extracted metal (SEM; Cd, Cr, Cu, Fe, Mn, Pb, and Zn). Moreover, the concentrations of SEM (Cd, Cr, Cu, Fe, Mn, Pb, and Zn) generally tended to decrease with an increase in the desalination level. The desalination treatment significantly reduced the ratios of SEM/AVS compared with control. However, the ratios of SEM/AVS increased with enhanced desalination levels in treatments. Results reveal that low desalination treatment is better for reducing toxicity to benthic organisms than high desalination treatment. Since these reclaimed tidal flats with low desalinisation are suitable for saline water aquaculture, transforming the present land use of reclaimed tidal flats from fresh water aquaculture into saline water aquaculture may reduce health risk of heavy metals remained in sediments. These results will also contribute to our understanding of the dynamic behavior of heavy metals in the reclamation of tidal flats during leaching and the role of the ratio of SEM/AVS predictions on assessing the ecological risks of reclaimed tidal flats. Keywords Acid-volatile sulfide Heavy metal Salinity Leaching Reclamation Tidal sediment