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Vol. 25 No. 1 (2013): Vol 25 Issue 1

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Effect of Oxalic Acid and Humic Acid on the Species Distribution and Activity of Fluoride in Soil

https://doi.org/10.14233/ajchem.2013.13193
Wen Chen
Institute of Life Science and Technology, University of Electronic Science and Technology of China, Chengdu 610054, P.R. China ; College of Material Chemistry and Chemical Engineering, Mineral Resources Chemistry Key Laboratory of Sichuan Higher Education Institutions, Chengdu University of Technology, Chengdu 610059, P.R. China
Xiao-Feng Pang
Institute of Life Science and Technology, University of Electronic Science and Technology of China, Chengdu 610054, P.R. China
Jing-Hui Li
College of Material Chemistry and Chemical Engineering, Mineral Resources Chemistry Key Laboratory of Sichuan Higher Education Institutions, Chengdu University of Technology, Chengdu 610059, P.R. China
Xing Hang
College of Material Chemistry and Chemical Engineering, Mineral Resources Chemistry Key Laboratory of Sichuan Higher Education Institutions, Chengdu University of Technology, Chengdu 610059, P.R. China

Corresponding Author(s) : Wen Chen

chenwen2010@foxmail.com

Asian Journal of Chemistry, Vol. 25 No. 1 (2013): Vol 25 Issue 1

Abstract

In order to study the effect of oxalic acid and humic acid on the acidity and transformation law of fluoride in high fluoride-contained soil, the tropic Zhu Jiang delta soil sample (fluvo-aqui soil and paddy soil) was investigated by the test method using polarography while sequential extraction was conducted to extract fluoride of various species in the original soil sample and the cultivated soil sample respectively. The result indicates that the oxalic acid concentration being over 0.02 mmol/g, oxalic acid has great influence on the soil pH value and the content of water soluble fluoride (Ws-F), exchangeable fluoride (Ex-F) and fluoride bond to Fe/Mn oxides (Fe/Mn-F); the acidity of the two soils decreases. The content of fluoride of other species increases significantly. While the content of humic acid at an appropriate concentration range (£1.514 mg/g) leads to the decrease of water soluble fluoride and fluoride bond to Fe/Mn oxides and the increase of exchangeable fluoride. This paper concludes, compared with high-molecular-weight organic acid, low-molecular-weight organic acid can activate fluoride in soil more easily, which in turn induces more fluoride intake by crops. Fluoride bound to organic matter (Or-F) is not discussed as its content is lower than the blank solution.

Keywords

Soil Fluoride Species Oxalic acid Humic acid
Chen, W., Pang, X.-F., Li, J.-H., & Hang, X. (2012). Effect of Oxalic Acid and Humic Acid on the Species Distribution and Activity of Fluoride in Soil. Asian Journal of Chemistry, 25(1), 469–474. https://doi.org/10.14233/ajchem.2013.13193
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