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首页> 外文期刊>Environmental Science & Technology >XANES Demonstrates the Release of Calcium Phosphates from Alkaline Vertisols to Moderately Acidified Solution
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XANES Demonstrates the Release of Calcium Phosphates from Alkaline Vertisols to Moderately Acidified Solution

机译：XANES证明磷酸钙从碱性Vertisols释放到中度酸化的溶液

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摘要

Calcium phosphate (CaP) minerals may comprise the main phosphorus (P) reserve in alkaline soils, with solubility dependent on pH and the concentration of Ca and/or P in solution. Combining several techniques in a novel way, we studied these phenomena by progressively depleting P from suspensions of two soils (low P) using an anion-exchange membrane (AEM) and from a third soil (high P) with AEM together with a cation-exchange membrane. Depletions commenced on untreated soil, then continued as pH was manipulated and maintained at three constant pH levels: the initial pH (pH,) and pH 6.5 and 5.5. Bulk P K-edge X-ray absorption near-edge structure (XANES) spectroscopy revealed that the main forms of inorganic P in each soil were apatite, a second more soluble CaP mineral, and smectite-sorbed P. With moderate depletion of P at pH, or pH 6.5, CaP minerals became more prominent in the spectra compared to sorbed species. The more soluble CaP minerals were depleted at pH 6.5, and all CaP minerals were exhausted at pH 5.5, showing that the CaP species present in these alkaline soils are soluble with decreases of pH in the range achievable by rhizosphere acidification.
机译：磷酸钙（CaP）矿物可能构成碱性土壤中的主要磷（P）储备，其溶解度取决于pH值以及溶液中Ca和/或P的浓度。我们以新颖的方式结合了多种技术，通过使用阴离子交换膜（AEM）从两种土壤（低P）的悬浮液中逐步消耗P，并使用AEM和阳离子-交换膜。在未经处理的土壤上开始消耗，然后在控制pH值并将其保持在三个恒定的pH值水平上继续消耗：初始pH值（pH）和pH 6.5和5.5。大块P K边缘X射线吸收近边缘结构（XANES）光谱显示，每种土壤中无机P的主要形式为磷灰石，第二种更易溶解的CaP矿物和蒙脱石吸附的P。 pH或pH 6.5时，CaP矿物比吸收物种在光谱中更加突出。溶解性更强的CaP矿物质在pH 6.5时耗尽，所有CaP矿物质在pH 5.5时耗尽，这表明存在于这些碱性土壤中的CaP物质在根际酸化可达到的pH值降低的范围内可溶。

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  • 来源
    《Environmental Science & Technology》 |2016年第8期|4229-4237|共9页
  • 作者

    Karl O. Andersson; Matthew K. Tighe; Christopher N. Guppy; Paul J. Milham; Timothy I. McLaren; Cassandra R. Schefe; Enzo Lombi;

  • 作者单位

    Agronomy and Soil Science, School of Environmental and Rural Science, University of New England, Armidale, New South Wales 2350, Australia;

    Agronomy and Soil Science, School of Environmental and Rural Science, University of New England, Armidale, New South Wales 2350, Australia;

    Agronomy and Soil Science, School of Environmental and Rural Science, University of New England, Armidale, New South Wales 2350, Australia;

    Agronomy and Soil Science, School of Environmental and Rural Science, University of New England, Armidale, New South Wales 2350, Australia ,Hawkesbury Institute for the Environment and the School of Science and Health, University of Western Sydney, LB 1797, Penrith, New South Wales 2751, Australia;

    Agronomy and Soil Science, School of Environmental and Rural Science, University of New England, Armidale, New South Wales 2350, Australia ,Group of Plant Nutrition, Institute of Agricultural Sciences, Swiss Federal Institute of Technology (ETH) Zurich, Eschikon 33, CH-8315 Lindau, Switzerland;

    Schefe Consulting, 59 Sheridan Court, Rutherglen, Victoria 3685, Australia;

    Future Industries Institute, University of South Australia, Building Ⅹ, Mawson Lakes Campus, Mawson Lakes, South Australia 5095, Australia;

  • 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);
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