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首页> 外文期刊>Environmental Science & Technology >Kinetics of Calcium Phosphate Nucleation and Growth on Calcite: Implications for Predicting the Fate of Dissolved Phosphate Species in Alkaline Soils
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Kinetics of Calcium Phosphate Nucleation and Growth on Calcite: Implications for Predicting the Fate of Dissolved Phosphate Species in Alkaline Soils

机译：方解石上磷酸钙成核和生长的动力学：预测碱性土壤中溶解的磷酸盐物种的命运的意义。

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摘要

Unraveling the kinetics of calcium orthophosphate (Ca-P) precipitation and dissolution is important for our understanding of the transformation and mobility of dissolved phosphate species in soils. Here we use an in situ atomic force microscopy (AFM) coupled with a fluid reaction cell to study the interaction of phosphate-bearing solutions with calcite surfaces. We observe that the mineral surface-induced formation of Ca-P phases is initiated with the aggregation of clusters leading to the nucleation and subsequent growth of Ca-P phases on calcite, at various pH values and ionic strengths relevant to soil solution conditions. A significant decrease in the dissolved phosphate concentration occurs due to the promoted nucleation of Ca-P phases on calcite surfaces at elevated phosphate concentrations and more significantly at high salt concentrations. Also, kinetic data analyses show that low concentrations of citrate caused an increase in the nucleation rate of Ca-P phases. However, at higher concentrations of citrate, nucleation acceleration was reversed with much longer induction times to form Ca-P nuclei. These results demonstrate that the nucleation-modifying properties of small organic molecules may be scaled up to analyze Ca-P dissolution-precipitation processes that are mediated by a more complex soil environment. This in situ observation, albeit preliminary, may contribute to an improved understanding of the fate of dissolved phosphate species in diverse soil systems.
机译：阐明正磷酸钙（Ca-P）沉淀和溶解的动力学对于我们理解土壤中溶解的磷酸盐物质的转化和迁移性很重要。在这里，我们使用原位原子力显微镜（AFM）结合流体反应池来研究含磷酸盐溶液与方解石表面的相互作用。我们观察到，在各种pH值和与土壤溶液条件相关的离子强度下，矿物表面诱导的Ca-P相形成是由团簇的聚集引发的，从而导致方解石上Ca-P相成核和随后的生长。溶解磷酸盐浓度的显着降低是由于在磷酸盐浓度升高时方解石表面上Ca-P相的成核作用增强，而在高盐浓度下则更为明显。同样，动力学数据分析表明，低浓度的柠檬酸盐会导致Ca-P相的成核速率增加。但是，在柠檬酸盐浓度较高时，成核速度会逆转，诱导时间要长得多，从而形成Ca-P核。这些结果表明，可以扩大有机小分子的成核修饰特性，以分析由更复杂的土壤环境介导的Ca-P溶解-沉淀过程。尽管是初步的，但这种现场观察可能有助于更好地了解各种土壤系统中溶解的磷酸盐物种的命运。

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  • 来源
    《Environmental Science & Technology》 |2012年第2期|p.834-842|共9页
  • 作者

    Lijun Wang; Encarnacion Ruiz-Agudo; Christine V. Putnis; Martina Menneken; Andrew Putnis;

  • 作者单位

    College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China;

    Department of Mineralogy and Petrology, University of Granada, Granada 18071, Spain;

    Institut fuer Mineralogie, University of Munster, 48149 Munster, Germany;

    Institut fuer Mineralogie, University of Munster, 48149 Munster, Germany;

    Institut fuer Mineralogie, University of Munster, 48149 Munster, Germany;

  • 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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