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首页> 外文OA文献 >Micro-X-Ray Fluorescence, Micro-X-Ray Absorption Spectroscopy, and Micro-X-Ray Diffraction Investigation of Lead Speciation after the Addition of Different Phosphorus Amendments to a Smelter-Contaminated Soil
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Micro-X-Ray Fluorescence, Micro-X-Ray Absorption Spectroscopy, and Micro-X-Ray Diffraction Investigation of Lead Speciation after the Addition of Different Phosphorus Amendments to a Smelter-Contaminated Soil

机译：在冶炼厂污染的土壤中添加不同磷修正后的铅形态的微X射线荧光，微X射线吸收光谱和微X射线衍射研究

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The stabilization of Pb on additions of P to contaminated soils and mine spoil materials has been well documented. It is clear from the literature that different P sources result in different efficacies of Pb stabilization in the same contaminated material. We hypothesized that the differences in the efficacy of Pb stabilization in contaminated soils on fluid or granular P amendment addition is due to different P reaction processes in and around fertilizer granules and fluid droplets. We used a combination of several synchrotron-based techniques (i.e., spatially resolved micro-X-ray fluorescence, micro-X-ray absorption near-edge structure spectroscopy, and micro-X-ray diffraction) to speciate Pb at two incubation times in a smelter-contaminated soil on addition of several fluid and granular P amendments. The results indicated that the Pb phosphate mineral plumbogummite was an intermediate phase of pyromorphite formation. Additionally, all fluid and granular P sources were able to induce Pb phosphate formation, but fluid phosphoric acid (PA) was the most effective with time and distance from the treatment. Granular phosphate rock and triple super phosphate (TSP) amendments reacted to generate Pb phosphate minerals, with TSP being more effective at greater distances from the point of application. As a result, PA and TSP were the most effective P amendments at inducing Pb phosphate formation, but caution needs to be exercised when adding large amounts of soluble P to the environment.
机译：在污染土壤和矿渣中添加P可以稳定Pb。从文献中可以清楚地看出，在相同的受污染材料中，不同的磷源会导致不同的铅稳定效果。我们假设，在添加土壤或颗粒P修正剂的情况下，污染土壤中Pb稳定功效的差异是由于肥料颗粒和液滴内部及其周围的P反应过程不同所致。我们使用了几种基于同步加速器的技术（即，空间分辨的微X射线荧光，微X射线吸收近边缘结构光谱和微X射线衍射）的组合，在两个温育时间中指定了铅。添加了几种液态和粒状磷改良剂的冶炼厂污染土壤。结果表明，Pb磷酸盐矿物铅锌矿是焦晶石形成的中间阶段。此外，所有流体和颗粒状P源均能够诱导Pb磷酸盐的形成，但是随着时间和距离处理的距离，流体磷酸（PA）最有效。粒状磷矿石和三重超磷酸盐（TSP）改性剂反应生成了Pb磷酸盐矿物，而TSP在距应用点更远的距离处更有效。结果，PA和TSP是诱导Pb磷酸盐形成的最有效的P改良剂，但是当向环境中添加大量可溶性P时要格外小心。

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