中国农业科学2012，Vol.45Issue(22)：4643-4650,8.DOI:10.3864/j.issn.0578-1752.2012.22.010
不同酸提取条件下几种含钾矿物中钾释放动力学研究
Study on Potassium Release Kinetics of Several K-Bearing Minerals by Sequential Extraction of Different Acid Solution
摘要
Abstract
[Objective] Potassium release and kinetics of different K-bearing minerals were studied to provide scientific evidence for reasonable evaluation of K fertility and high efficient utilization of soil potassium. [Method] Different K-bearing minerals (biotite, muscovite, orthoclase and microcline) were extracted successively with low-molecular weight organic acids (oxalic acid, tartaric acid) and inorganic acids (HNO3) to study potassium release and kinetics. [ Result] The results showed that the amount of K from biotite extracted successively by oxalic acid, tartaric acid and HNO3 by increased significantly 2.7 times, 4.1 times and 22.3 times compared to that of by water, respectively. The release amount of K from muscovite increased by 61.2%, 106.5% and 226.8%, respectively. The release amount of K from orthoclase increased by 39.0%, 87.6% and 154.6%, respectively. The release amount of K from microcline increased by 44.5%, 88.9% and 158.7%, respectively. First order equation, power function, parabolic diffusion equation and Elovich equation were used to describe the release of K from K-bearing minerals. All the correlation coefficients (r) of the kinetic equations were from 0.708 to 1.000 which showed the most significant correlation (r0.01=0.549). [Conclusion] The amount of potassium released from K-bearing minerals increased significantly by the extractants, and it differed in different K-bearing minerals in order of biotite > muscovite > microcline ≈ orthoclase. The power function was the best model to describe the K release of biotite, orthoclase and microcline, and Elovich equation was the best model for muscovite.关键词
低分子量有机酸/含钾矿物/释放/动力学Key words
low-molecular weight organic acids/ K-bearing minerals/ potassium release/ kinetics引用本文复制引用
王瑾,李小坤,鲁剑巍,王筝,占丽平..不同酸提取条件下几种含钾矿物中钾释放动力学研究[J].中国农业科学,2012,45(22):4643-4650,8.基金项目
国家自然科学基金(41001178)、公益性行业(农业)科研专项经费资助(201203013)、华中农业大学新进博士科研启动专项(2009BQ080)、中央高校基本科研业务费专项资金 （41001178）
