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Adsorption of Phosphate on Manganese Dioxide in Seawater

机译：磷酸盐在海水中二氧化锰上的吸附

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摘要

The adsorption of phosphate on manganese dioxide (δMnO_2) was determined in seawater as a function of pH, temperature, and salinity. The adsorptipn in a simple electrolyte solution (0.7 M NaCl) was adequately fitted using the triple-layer surface complexation model, assuming that phosphate formed outer-sphere complexes on the surface of δMnO_2. SO_4~(2-) and humic acid were found to suppress the adsorption at low pH, but had no effect in the pH range of seawater. The addition of Ca~(2+) and Mg~(2+) in 0.7 M NaCl was found to enhance the adsorption of phosphate on δMnO_2 at pH > 4. This increased adsorption might be due to the changes in both the surface charge of δMnO_2 and the solution speciation of phosphate in the presence of Ca~(2+) and Mg~(2+). The results suggest that manganese oxides can act as important adsorbents of phosphate in natural waters, as well as in surface sediments, when they are present at higher concentrations than other reactive constituents, such as iron and aluminum oxides.
机译：确定了磷酸盐在海水中对二氧化锰（δMnO_2）的吸附与pH，温度和盐度的关系。假设磷酸盐在δMnO_2表面上形成了外球络合物，则使用三层表面络合模型可将简单的电解质溶液（0.7 M NaCl）中的adstopptipn充分拟合。发现SO_4〜（2-）和腐殖酸在低pH值下抑制了吸附，但在海水的pH值范围内没有影响。发现在pH> 4时，在0.7 M NaCl中添加Ca〜（2+）和Mg〜（2+）可以增强磷酸盐在δMnO_2上的吸附。这种增加的吸附可能是由于两个表面电荷的变化所致。 Ca〜（2+）和Mg〜（2+）存在下δMnO_2和磷酸盐的溶液形态。结果表明，当锰氧化物的浓度高于其他反应性成分（如铁和氧化铝）时，锰氧化物可以作为天然水中以及表面沉积物中磷酸盐的重要吸附剂。

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  • 来源
    《Environmental Science & Technology》 |1996年第2期|p.536-541|共6页
  • 作者

    WENSHENG YAO; FRANK J. MILLERO;

  • 作者单位

    Rosenstiel School of Marine and Atmospheric Science, Division of Marine and Atmospheric Chemistry, University of Miami, Miami, Florida 33149-1098;

  • 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 环境化学;
  • 关键词

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