低分子量有机酸培养下几种层状硅酸盐矿物的变化  

Changes of Phyllosillicates Cultivated by Low-molecular-weight Organic Acids

作　　者：孔明明[1] 郑世学[2] 黄丽[1] 刘凡[1] 

机构地区：[1]华中农业大学农业部长江中下游耕地保育重点实验室,武汉430070 [2]华中农业大学农业微生物学国家重点实验室,武汉430070

出　　处：《土壤》2013年第2期285-290,共6页Soils

基　　金：国家自然科学基金项目(40971143);中央高校基本科研业务费专项基金(2008XCX009)资助

摘　　要：以两种低分子量有机酸（草酸、柠檬酸），三种层状硅酸盐矿物（高岭石、蒙脱石、伊利石）为材料，研究加入不同浓度有机酸（0～0．500mol／L）恒温振荡培养3、7、15天后，各矿物的释硅（Si）量以及矿物结构的变化。研究表明：随着培养时间的增加，各浓度有机酸培养下高岭石和伊利石的释Si量在15天达到最大；在矿物相同的情况下，草酸培养体系大部分较相同浓度柠檬酸体系释放出的Si量高，Si的释放量在0．48～244．30pg／ml（以Si02计）之间；随着有机酸浓度的升高，各矿物Si的释放量均先升高后降低，在有机酸种类和浓度相同的情况下，蒙脱石释放出的Si量最高；随着有机酸浓度的升高，蒙脱石x射线衍射（xnD）图谱中特征峰的强度依次减弱，且草酸较柠檬酸作用效果显著，高岭石和伊利石的则无明显变化。Si release and structure changes of three phyllosillicates （kaolinite, montmorillonite, illite） were investigated after being batch cultivated by two kinds of organic acid （oxalic acid and citric acid） under different concentrations （0 - 0.500 mol/L） at 25℃. Results indicated that with the increase of time Si release from kaolinite and illite reached the maximum amount after cultivation by organic acid under different concentrations for 15d. The release amount of Si from phyllosillicates in organic acid was between 0.48 and 244.30μg/ml （SiO2） and higher in oxalic acid treatment than that in citric acid. Si release from each phyllosillicate decreased with the increase of organic acid concentration. The release amount of Si was most from montmorillonite compared with other phyllosillicates with the same concentration of organic acids. With the increase of organic acid concentration, the characteristic peak intensities of montmorillonite in X-ray diffraction （XRD） pattern decreased successively and more remarkable in oxalic acid treatment than in citric acid, while there were no obvious changes in cultivated kaolinite and illite.

关 键 词：低分子量有机酸 层状硅酸盐矿物 培养 Si的释放量 XRD图谱 

分 类 号：S153[农业科学—土壤学]