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Effects of soil pH and organic matter on distribution of thorium fractions in soil contaminated by rare-earth industries |
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| Authors: | Pengran Guo Taicheng Duan Jingwei Xu Hangting Chen |
| Affiliation: | a National Analytical Research Center of Electrochemistry & Spectroscopy, Changchun Institute of Applied Chemistry, Chinese Academy of Science, Changchun 130022, China b Graduate School of Chinese Academy of Sciences, Beijing 100039, China c State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Science, Changchun 130022, China |
| Abstract: | The labilities of thorium fractions including mobility and bioavailability vary significantly with soil properties. The effects of soil pH and soil organic matter on the distribution and transfer of thorium fractions defined by a sequential extraction procedure were investigated. Decrease of soil pH could enhance the phytoavailability and the potential availability of thorium in soil. Increase of organic matter reduced the phytoavailability of thorium, but enhanced the potential availability of it. The reasons why soil pH and soil organic matter affect thorium fractions were discussed, and the behavior of the effects of soil properties on thorium fractions was elucidated. Fourier-transform infrared (FTIR) spectra were employed to reveal the positive relationship between the amounts adsorbed in humic material and/or amorphous oxides and the content of soil organic matter. |
| Keywords: | Thorium Soil pH Soil organic matter Availability |
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