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首页> 外文期刊>Environmental Science & Technology >Microscopically focused synchrotron X-ray investigation of selenium speciation in soils developing on reclaimed mine lands
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Microscopically focused synchrotron X-ray investigation of selenium speciation in soils developing on reclaimed mine lands

机译：用显微镜聚焦的同步加速器X射线研究开垦矿区土壤中的硒形态

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Chemical speciation determines Se solubility and therefore its bicavailability and potential for transport in the environment. In this study we investigated the speciation of Se in soil developed on reclaimed mine sites in the U.S. Western Phosphate Resource Area (WPRA) using micro-X-ray absorption near-edge structure (mu-XANES) spectroscopy and micro-X-ray fluorescence (mu-XRF) mapping. Selenium was nonuniformly distributed in the soils and positively correlated with Fe, Mn, Cu, Zn, and Ni. Sixteen points of interest (POI) from three soil samples were analyzed with mu-XANES spectroscopy. The XANES data indicated that Se is present in the soils in at least three oxidation states, Se(-II, 0), Se(IV), and Se(VI). Selenides or elemental Se dominated 7 of the 16 POI Selenate was the dominant species at only one of the POI. The remaining eight POI were composed of both Se(IV) and Se(VI), with minor Se(-11, 0) contributions. The results of this research suggest that the reduced Se species in the soil parent material are oxidizing to Se(VI), one of the more mobile species of Se in the environment. This information can be used to better predict and manage Se availability in soils.
机译：化学形态决定了硒的溶解度，因此决定了硒的可利用性以及在环境中的迁移潜力。在这项研究中，我们使用微X射线吸收近边缘结构（mu-XANES）光谱和微X射线荧光技术研究了美国西部磷酸盐资源区（WPRA）矿区开垦后土壤中硒的形态。 （mu-XRF）映射。硒在土壤中分布不均匀，与铁，锰，铜，锌和镍呈正相关。用mu-XANES光谱分析了三个土壤样品的16个兴趣点（POI）。 XANES数据表明，Se以至少三种氧化态Se（-II，0），Se（IV）和Se（VI）存在于土壤中。在16个POI中，硒化物或元素硒占主导地位7硒酸盐是仅一种POI的优势种。其余八个POI由Se（IV）和Se（VI）组成，Se（-11，0）的贡献较小。这项研究的结果表明，土壤母体材料中还原的Se物种正在氧化为Se（VI），Se（VI）是环境中较易移动的Se物种之一。该信息可用于更好地预测和管理土壤中硒的有效性。

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