不同浓度草酸对酸沉降下高岭石的溶解作用
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国家自然科学基金(40371067);中国科学院知识创新工程项目(KZCX3-SW-417, ISSASIP0208)


Dissolution of Acid-Eluviated Kaolinite Induced by Different Concentrations of Oxalic Acid
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    摘要:

    采用间歇法,模拟研究酸沉降高岭石在草酸溶液中的长期溶解效应.结果表明:草酸能显著促进高岭石的溶解,且草酸对高岭石的溶解能力随其浓度的升高而增强;相对于柠檬酸,草酸作用下,高岭石Al3+和Si4+开始趋于同步释放的时间较晚,呈现Al3+的先行释放.同柠檬酸和无机酸作用下的高岭石溶解速率相比,草酸作用下的高岭石溶解速率较高,并较无机酸高1个数量级左右;且在本研究浓度范围内,草酸对高岭石的溶解速率并未呈现对草酸浓度的饱和性,而呈现对其浓度的线性增长.

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    Experiments were conducted to investigate the long-time dissolution effect of acid-eluviated kaolinite with batch method in oxalic acids solution. The results showed oxalic acids enhanced significantly Al3+and Si4+ release from kaolinite, compared with deionised water, and release of Al3+ and Si4+ from kaolinite increased with concentration of oxalic acids. The time of dissolution stoichiometry of kaolinite in the oxalic acids solution was later than the citric acids,and preferential Al3+-release was observed initially and after reaction anaphase, Al3+ and Si4+ showed stoichiometric release. The rate of kaolinite dissolution obtained in oxalic acid solution was almost one order of magnitude as large as that of inorganic acid, and which was higher than the citric acids, and dissolution rare did not reach saturation under the studied concentration of oxalic acids noted in this study, the dissolution rate presented an increasing character of linearity with the concentration of citric acids.

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胡华锋,冯广鹏,王兴祥,介晓磊,李清曼.不同浓度草酸对酸沉降下高岭石的溶解作用[J].华南农业大学学报,2013,34(2):158-161

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  • 收稿日期:2012-03-13
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  • 在线发布日期: 2013-04-19