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Relative Importance of Solid-Phase Phosphorus and Iron on the Sorption Behavior of Sediments

机译:固相磷和铁对沉积物吸附行为的相对重要性

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摘要

Of all the metal oxide particles, amorphous iron oxides have the greatest adsorption capacity for phosphate. Coastal sediments are often coated with terrigenous amorphous iron oxides, and those containing high iron are thought to have a high adsorption capacity. However, this conventional wisdom is based largely upon studies of phosphate adsorption on laboratory-synthesized minerals themselves containing no phosphorus. Using natural sediments that contain variable phosphorus and iron, our results demonstrate that the exchangeable phosphate rather than the iron oxides of sediments governs the overall sorption behavior. The iron oxide content becomes important only in sediments that are poor in phosphorus. A total of 40 sampling sites across the Florida Bay provide detailed spatial distributions both of the sediment's zero equilibrium phosphate concentration (EPC_0) and of the distribution coefficient (K_d) that are consistent with the distribution of the exchangeable phosphate content of the sediment. This study provides the first quantitative relationships between sorption characteristics (EPC_0 and K_d) and the exchangeable phosphate content of natural sediments.
机译:在所有金属氧化物颗粒中,无定形氧化铁对磷酸盐的吸附能力最大。沿海沉积物经常被陆上的无定形氧化铁所覆盖,而铁含量高的沉积物被认为具有高吸附能力。但是,这种传统观点主要是基于对磷合成物的实验室吸附矿物本身的磷吸附研究。使用包含可变的磷和铁的天然沉积物,我们的结果表明,沉积物的可交换磷酸盐而不是铁氧化物决定了整体的吸附行为。氧化铁含量仅在磷含量低的沉积物中才变得重要。横跨佛罗里达湾的总共40个采样点提供了沉积物的零平衡磷酸盐浓度(EPC_0)和分布系数(K_d)的详细空间分布,这些分布与沉积物中可交换磷酸盐含量的分布一致。这项研究提供了吸附特征(EPC_0和K_d)与天然沉积物中可交换的磷酸盐含量之间的第一个定量关系。

著录项

  • 来源
    《Environmental Science & Technology》 |2007年第8期|p.2789-2795|共7页
  • 作者单位

    Ocean Chemistry Division, Atlantic Oceanographic and Meteorological Laboratory, National Oceanic and Atmospheric Administration, Miami, Florida 33149;

  • 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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