Arsenic immobilization in the contaminated soil using poorly crystalline Fe-oxyhydroxy sulfate

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• 作者：Zhihui Yang ; Lin Liu ; Liyuan Chai…
• 关键词：Arsenic ; contaminated soil ; Arsenic immobilization ; Low crystalline Fe ; oxyhydroxy sulfate ; Sequential chemical extraction
• 刊名：Environmental Science and Pollution Research
• 出版年：2015
• 出版时间：August 2015
• 年：2015
• 卷：22
• 期：16
• 页码：12624-12632
• 全文大小：2,228 KB
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• 作者单位：Zhihui Yang (1) (2)
  Lin Liu (1)
  Liyuan Chai (1) (2)
  Yingping Liao (1)
  Wenbin Yao (1)
  Ruiyang Xiao (1)
  
  1. School of Metallurgy and Environment, Central South University, Changsha, 410083, China
  2. Chinese National Engineering Research Center for Control and Treatment of Heavy Metal Pollution, Changsha, 410083, China
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Environment
  Environment
  Atmospheric Protection, Air Quality Control and Air Pollution
  Waste Water Technology, Water Pollution Control, Water Management and Aquatic Pollution
  Industrial Pollution Prevention
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1614-7499

文摘

A low crystalline Fe-oxyhydroxy sulfate (FeOS) was used to immobilize arsenic (As) in soils in this study. The effects of FeOS amount, treatment time and soil moisture on As immobilization were investigated. The results showed that water-soluble and NaHCO3-extractable As were immobilized by 53.4-9.8 and 13.8-3.3?% respectively, with 1-0?% of FeOS addition. The highest immobilization of water-soluble (98.5?%) and NaHCO3-extractable arsenic (47.2?%) was achieved under condition of 4?% of FeOS and 80?% of soil moisture. Further, more amounts of FeOS addition resulted in less time requirement for As immobilization. Sequential chemical extraction experiment revealed that easily mobile arsenic phase was transferred to less mobile phase. The FeOS-bonded As may play a significant role in arsenic immobilization. Under leaching with simulated acid rain at 60 times pore volumes, accumulation amount of As release from untreated soil and soil amended with FeOS were 98.4 and 1.2?mg, respectively, which correspond to 7.69 and 0.09?% of total As amounts in soil. The result showed that the low crystalline FeOS can be used as a suitable additive for arsenic immobilization in soils.