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Iron-rich colloids as carriers of phosphorus in streams: A field-flow fractionation study

机译:富铁胶体作为流中磷的载体:场流分馏研究

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摘要

Colloidal phosphorus (P) may represent an important fraction of the P in natural waters, but these colloids remain poorly characterized. In this work, we demonstrate the applicability of asymmetric flow field-flow fractionation (AF4) coupled to high resolution ICP-MS for the characterization of low concentrations of P-bearing colloids. Colloids from five streams draining catchments with contrasting properties were characterized by AF4-ICP-MS and by membrane filtration. All streams contain free humic substances (2-3 nm) and Fe-bearing colloids (3-1200 nm). Two soft water streams contain primary Fe oxyhydroxide-humic nanoparticles (3-6 nm) and aggregates thereof (up to 150 nm). In contrast, three harder water streams contain larger aggregates (40-1200 nm) which consist of diverse associations between Fe oxyhydroxides, humic substances, clay minerals, and possibly ferric phosphate minerals. Despite the diversity of colloids encountered in these contrasting streams, P is in most of the samples predominantly associated with Fe-bearing colloids (mostly Fe oxyhydroxides) at molar P:Fe ratios between 0.02 and 1.5. The molar P:Fe ratio of the waters explains the partitioning of P between colloids and truly dissolved species. Waters with a high P:Fe ratio predominantly contain truly dissolved species because the Fe-rich colloids are saturated with P, whereas waters with a low P:Fe ratio mostly contain colloidal P species. Overall, AF4-ICP-MS is a suitable technique to characterize the diverse P-binding colloids in natural waters. Such colloids may increase the mobility or decrease the bioavailability of P, and they therefore need to be considered when addressing the transport and environmental effects of P in catchments. (C) 2016 Elsevier Ltd. All rights reserved.
机译:胶体磷(P)可能代表天然水中P的重要部分,但是这些胶体的特征仍然很差。在这项工作中,我们证明了不对称流场流分馏(AF4)与高分辨率ICP-MS结合用于表征低浓度含P胶体的适用性。通过AF4-ICP-MS和膜过滤对来自五个流域集水流的具有对比特性的胶体进行了表征。所有物流均含有游离的腐殖质(2-3 nm)和含铁胶体(3-1200 nm)。两条软水流包含初级羟基氧化铁-腐殖质纳米颗粒(3-6 nm)及其聚集体(最大150 nm)。相反,三种较硬的水流包含较大的聚集体(40-1200 nm),这些聚集体由羟基氧化铁,腐殖质,粘土矿物和可能的磷酸铁矿物之间的各种关联组成。尽管在这些对比流中遇到的胶体种类繁多,但大多数样品中的P主要与含Fe的胶体(主要为羟基氧化铁)以P:Fe摩尔比在0.02和1.5之间相关。水的P:Fe摩尔比解释了P在胶体和真正溶解的物质之间的分配。 P:Fe比率高的水主要包含真正溶解的物质,因为富Fe胶体被P饱和,而P:Fe比率低的水主要包含胶态P物质。总体而言,AF4-ICP-MS是表征天然水中各种P结合胶体的合适技术。这种胶体可能会增加P的迁移率或降低其生物利用度,因此,在解决P在流域中的迁移和环境影响时需要考虑它们。 (C)2016 Elsevier Ltd.保留所有权利。

著录项

  • 来源
    《Water Research》 |2016年第1期|83-90|共8页
  • 作者单位

    Katholieke Univ Leuven, Dept Earth & Environm Sci, Kasteelpk Arenberg 20 Bus 2459, B-3001 Leuven, Belgium|European Copper Inst, Ave Tervueren 168 B-10, B-1150 Brussels, Belgium;

    Alterra, Wageningen Univ & Res Ctr WUR, POB 47, NL-6700 AA Wageningen, Netherlands;

    Wageningen Univ, WUR, Dept Soil Qual, POB 47, NL-6700 AA Wageningen, Netherlands;

    Katholieke Univ Leuven, Dept Earth & Environm Sci, Kasteelpk Arenberg 20 Bus 2459, B-3001 Leuven, Belgium;

    Wageningen Univ, WUR, Dept Soil Qual, POB 47, NL-6700 AA Wageningen, Netherlands;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Natural water; Field-flow fractionation; Iron; Phosphorus; Colloids; Nanoparticles;

    机译:天然水;场流分离;铁;磷;胶体;纳米粒子;
  • 入库时间 2022-08-17 13:41:50

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