...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Environmental Science & Technology >Effects of Fulvic and Humic Acids on Arsenate Adsorption to Goethite: Experiments and Modeling
【24h】

Effects of Fulvic and Humic Acids on Arsenate Adsorption to Goethite: Experiments and Modeling

机译：富勒酸和腐殖酸对砷酸盐吸附针铁矿的影响：实验和模型

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Data for interactions between arsenate (AsO_4~(3-)) and fulvic acids (FA) or humic acids (HA) at the surface of goethite are presented (pH 3-7, ionic strength 2 mM and 10 mM|. Adsorption of FA and HA leads to desorption of arsenate and a correspondingly strong increase of arsenic concentration in solution. Adsorption of both FA and HA is mutually decreased by the competition with arsenate. The competition between FA and arsenate is much stronger than that between HA and arsenate. Using an advanced model, the LCD model (Ligand and Charge Distribution), arsenate adsorption to goethite in the presence of both adsorbed FA and HA can be predicted reasonably well. The stronger effects of FA on arsenate adsorption are caused, according to the model, by its spatial location which is closer to the oxide surface, and as a consequence, the electrostatic interactions between adsorbed FA particles and arsenate ions are much stronger than those for HA particles. The results show that site and electrostatic competition are the major mechanisms explaining the effects of natural organic matter on the arsenic speciation, whereas other possible mechanisms, such as a chemical reduction of arsenate to arsenite and formation of ternary organic arsenic complexes, are of minor significance.
机译：给出了针铁矿表面砷酸（AsO_4〜（3-））与黄腐酸（FA）或腐殖酸（HA）之间相互作用的数据（pH 3-7，离子强度2 mM和10 mM |。） HA导致砷酸盐的解吸，溶液中砷的浓度相应增加，FA和HA的吸附由于与砷酸盐的竞争而相互降低，FA和砷酸盐之间的竞争比HA和砷酸盐之间的竞争强得多。可以很好地预测一种先进的模型，即LCD模型（配体和电荷分布），即在FA和HA均存在的情况下砷对砷铁矿的吸附，该模型导致FA对砷的吸附作用更强。其空间位置更靠近氧化物表面，因此，吸附的FA颗粒与砷酸根离子之间的静电相互作用比HA颗粒的静电相互作用强得多。静水竞争是解释天然有机物对砷形成的影响的主要机制，而其他可能的机制（例如将砷酸盐化学还原为亚砷酸盐和形成三元有机砷配合物）则意义不大。

著录项

  • 来源
    《Environmental Science & Technology》 |2009年第19期|7198-7204|共7页
  • 作者

    LIPING WENG; WILLEM H. VAN RIEMSDIJK; TJISSE HIEMSTRA;

  • 作者单位

    Department of Soil Quality, Wageningen University, P.O. Box 47, 6700 AA Wageningen, The Netherlands;

    Department of Soil Quality, Wageningen University, P.O. Box 47, 6700 AA Wageningen, The Netherlands;

    Department of Soil Quality, Wageningen University, P.O. Box 47, 6700 AA Wageningen, The Netherlands;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号