Abstract
Using by sequential extraction procedures to obtain the chemical forms of arsenic in soils can provide useful information for the assessment of arsenic mobility and bioavailability in soils. However, sample pretreatments before the extraction probably have some effects on the fractionation of arsenic in soils. Impact of sample pretreatments (freeze-drying, oven-drying, air-drying, and the fresh soil) on the fractionation of arsenic in anoxic soils was investigated in this study. The results show that there are some differences for arsenic fractions in soils between by drying pretreatments and by the fresh soil, indicating that the redistribution among arsenic fractions in anoxic soils occurs after drying pretreatments. The redistribution of arsenic fractions in anoxic soils is ascribed to the oxidation of organic matter and sulfides, the crystallization of iron (hydr)oxides, the ageing process, and the diffusion of arsenic into micropores. The freeze-drying is the best drying method to minimize the effect on the fractionation of arsenic in anoxic soils, while air-drying is the worst one. Drying pretreatments are not recommended for the fractionation of arsenic in anoxic soils with high concentration of iron.
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Acknowledgments
This research was supported by the National Natural Science Foundation of China (No. 41103059), the China Geological Survey Grant (1212011121167), and the Basic Scientific Study Fund from the Institute of Hydrogeology and Environmental Geology, Chinese Academy of Geological Sciences (SK201410). The authors thank the reviewers and the editor for their constructive comments which helped to improve the manuscript substantially.
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Huang, G., Chen, Z., Sun, J. et al. Effect of sample pretreatment on the fractionation of arsenic in anoxic soils. Environ Sci Pollut Res 22, 8367–8374 (2015). https://doi.org/10.1007/s11356-014-3958-5
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DOI: https://doi.org/10.1007/s11356-014-3958-5