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引用本文:李世玉,刘彬,杨常亮,刘楷,宋阳煜,王艳丹,陈桂明,宋娟.上覆水pH值和总磷浓度对含铁盐的高砷沉积物中砷迁移转化的影响.湖泊科学,2015,27(6):1101-1106. DOI:10.18307/2015.0615
LI Shiyu,LIU Bin,YANG Changliang,LIU Kai,SONG Yangyu,WANG Yandan,CHEN Guiming,SONG Juan.Effect of pH and total phosphorus concentration of overlying water on arsenic mobilization in the sediments containing high arsenic and iron salts. J. Lake Sci.2015,27(6):1101-1106. DOI:10.18307/2015.0615
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上覆水pH值和总磷浓度对含铁盐的高砷沉积物中砷迁移转化的影响
李世玉1, 刘彬1, 杨常亮1, 刘楷2, 宋阳煜3, 王艳丹2, 陈桂明2, 宋娟3
1.云南大学工程技术研究院, 昆明 650091;2.云南大学生命科学学院, 昆明 650091;3.云南大学城市建设与管理学院, 昆明 650091
摘要:
含铁盐的高砷沉积物中,上覆水pH值和总磷浓度的变化对砷迁移的影响尚不明确.以含铁盐的高砷沉积物为研究对象,通过实验观测其暴露在不同pH值的上覆水及经过不同初始pH值、不同初始总磷浓度的溶液淋洗后,沉积物中砷的迁移规律.结果表明:当沉积物暴露在pH=10和11的上覆水时,分别在第11d和第6d后,沉积物中的砷溶出速度突然增大,说明当沉积物处于强碱性上覆水环境中,碱性越强,砷的溶出速度越快、溶出量越大.从室内实验条件的角度来看,上覆水的碱化有可能会增加沉积物中砷溶出的风险.而上覆水pH值在4~8之间时,上覆水的酸碱度对沉积物砷的迁移影响较小.此外,当上覆水总磷浓度不高于0.5mg/L时,磷的竞争吸附对砷的迁移影响较小.
关键词:  高砷  沉积物  土柱淋溶  pH值  
DOI:10.18307/2015.0615
分类号:
基金项目:国家自然科学基金项目(51168047)资助.
Effect of pH and total phosphorus concentration of overlying water on arsenic mobilization in the sediments containing high arsenic and iron salts
LI Shiyu1, LIU Bin1, YANG Changliang1, LIU Kai2, SONG Yangyu3, WANG Yandan2, CHEN Guiming2, SONG Juan3
1.Engineering Technology Institute, Yunnan University, Kunming 650091, P.R.China;2.School of Life Science, Yunnan University, Kunming 650091, P.R.China;3.School of Urban Construction and Management, Yunnan University, Kunming 650091, P.R.China
Abstract:
Effect of changes in the overlying water pH and total phosphorus concentrations on arsenic migration was unclear for sediments which contained high arsenic and iron salts. To figure out the rules of arsenic mobilization under different pH, initial pH and initial phosphorus concentrations, the experiments were conducted with the sediments which contained high arsenic and iron salts. Results showed that: When sediments exposed to overlying water of pH=10 and pH=11, leaching speed of arsenic enhanced suddenly after 11 days and 6 days, respectively. When sediments exposed to alkaline environment, stronger the alkalinity was, much quicker the leaching was,with more arsenic migration from the sediments. From the indoor experiments, lake alkalinization may increase the risk of arsenic mobilization from the sediments. However, there was little effect of pH which ranging from 4 to 8 on arsenic mobilization. When the concentration of phosphorus in overlying water was less than 0.5mg/L, the competitive adsorption of phosphorus had little effect on arsenic mobilization.
Key words:  High arsenic concentration  sediment  soil column leaching  pH  phosphorus
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