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pH和有机酸对氟溶出砖红壤中铝离子的影响

杨杰文 钟来元 郭荣发

杨杰文, 钟来元, 郭荣发. pH和有机酸对氟溶出砖红壤中铝离子的影响[J]. 环境科学研究, 2011, 24(2): 216-221.
引用本文: 杨杰文, 钟来元, 郭荣发. pH和有机酸对氟溶出砖红壤中铝离子的影响[J]. 环境科学研究, 2011, 24(2): 216-221.
YANG Jie-wen, ZHONG Lai-yuan, GUO Rong-fa. Effect of pH and Organic Acids on Mobilization of Aluminum Ions from Latosol by Fluoride Dissolution[J]. Research of Environmental Sciences, 2011, 24(2): 216-221.
Citation: YANG Jie-wen, ZHONG Lai-yuan, GUO Rong-fa. Effect of pH and Organic Acids on Mobilization of Aluminum Ions from Latosol by Fluoride Dissolution[J]. Research of Environmental Sciences, 2011, 24(2): 216-221.

pH和有机酸对氟溶出砖红壤中铝离子的影响

基金项目: 国家自然科学基金面上项目(40871156)

Effect of pH and Organic Acids on Mobilization of Aluminum Ions from Latosol by Fluoride Dissolution

  • 摘要: 研究砖红壤对F-的吸附反应尤其是随后Al3+的释放过程,有助于增进对土壤酸化过程及其环境影响的理解. 在初步揭示出F-吸附反应以及Al3+释放反应的动力学特征基础上,重点考察了pH和有机酸对上述反应的影响. 结果表明:土壤对F-的吸附反应十分迅速,2 min内吸附量即可达到24 h内总吸附量95%,而土壤中不同含铝矿物的溶解度差异使Al3+的释放过程在前15 min十分迅速,释放量可达24 h内总释放量的80%,随后则逐渐减缓. 降低反应体系pH可促进Al3+释放,但会使F-吸附量减少,这是因为伴随Al3+的释放,部分F-又可以AlF络合物的形态重新进入溶液,尽管在低pH条件下,土壤表面以带正电荷为主而有利于F-吸附. 草酸和抗坏血酸对土壤吸附F-均有抑制作用,但对F-溶出土壤Al3+有促进作用. 此外,草酸对土壤铁氧化物的选择性溶解作用,可使更多F-吸附在土壤铝氧化物位点,并导致Al3+释放量增加.

     

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出版历程
  • 收稿日期:  2010-07-01
  • 修回日期:  2010-10-28
  • 刊出日期:  2011-02-25

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