Sulfur speciation in two typical soil samples using X-ray absorption near-edge structure spectroscopy and chemical fractionation |
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Authors: | Chengyun Wang Kangning Yan Jiyan Shi |
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Institution: | 1. Zhangzhou Municipal Hospital, Zhangzhou, China;2. Key Laboratory for Water Pollution Control and Environmental Safety, Zhejiang Province, Hangzhou, China |
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Abstract: | Sulfur K-edge X-ray absorption near-edge structure spectroscopy and chemical sequential extraction was respectively used to study the speciation of sulfur in two sulfur-rich soils samples. Sulfur K-edge X-ray absorption near-edge structure spectroscopy analysis obtained a variety of spectra. Spectral fitting of the X-ray absorption near-edge structure spectra utilizing a large set of model compounds showed great differences between these two sulfur-rich soil samples. It was found that both of the soil samples had high sulfur content (8.40 and 11.57?g?kg?1, respectively). Chemical extraction results suggested that sulfur mainly existed as organic in the ancient paddy soil (7.37?g?kg?1) and more reduced sulfur was identified in it. X-ray absorption near-edge structure spectroscopy also got similar results. These organic forms of sulfur existed in organic matter across a range of oxidation states. There was high proportion of oxidized sulfur in the sulfuric acid plant that mainly existed as sulfate. |
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Keywords: | Sequential extraction soil speciation sulfur X-ray absorption near-edge structure |
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