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首页> 外文期刊>Geoderma: An International Journal of Soil Science >Nickel speciation in several serpentine (ultramafic) topsoils via bulk synchrotron-based techniques
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Nickel speciation in several serpentine (ultramafic) topsoils via bulk synchrotron-based techniques

机译：几种蛇纹石（Ultramafic）甲醛的镍晶状体通过批量同步技术的技术

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Serpentine soils have elevated concentrations of trace metals including nickel, cobalt, and chromium compared to non-serpentine soils. Identifying the nickel bearing minerals allows for prediction of potential mobility of nickel. Synchrotron-based techniques can identify the solid-phase chemical forms of nickel with minimal sample treatment. Element concentrations are known to vary among soil particle sizes in serpentine soils. Sonication is a useful method to physically disperse sand, silt and clay particles in soils. Synchrotron-based techniques and sonication were employed to identify nickel species in discrete particle size fractions in several serpentine (ultramafic) topsoils to better understand solid-phase nickel geochemistry. Nickel commonly resided in primary serpentine parent material such as layered-phyllosilicate and chain-inosilicate minerals and was associated with iron oxides. In the clay fractions, nickel was associated with iron oxides and primary serpentine minerals, such as lizardite. Linear combination fitting (LCF) was used to characterize nickel species. Total metal concentration did not correlate with nickel speciation and is not an indicator of the major nickel species in the soil. Differences in soil texture were related to different nickel speciation for several particle size fractionated samples. A discussion on LCF illustrates the importance of choosing standards based not only on statistical methods such as Target Transformation but also on sample mineralogy and particle size. Results from the F-test (Hamilton test), which is an underutilized tool in the literature for LCF in soils, highlight its usefulness to determine the appropriate number of standards to for LCF. EXAFS shell fitting illustrates that destructive interference commonly found for light and heavy elements in layered double hydroxides and in phyllosilicates also can occur in inosilicate minerals, causing similar structural features and leading to false positive results in LCF. (C) 2017 Elsevier B.V. All rights reserved.
机译：与非蛇形土壤相比，蛇纹石土壤含有镍，钴和铬，包括镍，钴和铬。识别镍轴承矿物允许预测镍的潜在迁移率。基于同步的技术可以鉴定具有最小样品处理的固相化学形式的镍。已知元素浓度在蛇纹石土壤中的土壤颗粒尺寸之间变化。超声处理是一种有用的方法，可以将砂，淤泥和土壤中的粘土颗粒分散。基于同步的技术和超声处理用于鉴定几种蛇形（超空间）甲虫中的离散粒度级分中的镍种以更好地理解固相镍地球化学。镍通常留在初级蛇形母体材料中，例如层状硅酸盐和链硅酸盐矿物质，与氧化铁相关。在粘土级分中，镍与氧化铁和原发性蛇形矿物质相关，例如蜥蜴。线性组合配合（LCF）用于表征镍种。总金属浓度与镍形态无关，不是土壤中主要镍种的指标。土壤纹理的差异与几种粒度分级样品的不同镍形态有关。关于LCF的讨论表示不仅基于统计方法，例如目标转化等统计方法，还可以对样品矿物学和粒径进行选择。 F-Test（Hamilton Test）的结果是在土壤中LCF的文献中的未充分利用工具，突出了确定适当数量的LCF标准的有用性。 EXAFS壳拟合说明了诸如层次的双氢氧化物中的光和重元素和神经硅酸盐中常见的破坏性干扰也可以在杀虫矿物质中发生，导致类似的结构特征并导致LCF中的假阳性结果。 （c）2017 Elsevier B.v.保留所有权利。

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