| 王琦,马龙,黄康俊,雷志远,谢淑云.蒙脱石、高岭石和伊利石X射线衍射定量分析[J].贵州地质,2021,38(1):71-78 |
| 蒙脱石、高岭石和伊利石X射线衍射定量分析 |
| Quantitative Analysis of Kaolinite, Illite and Montmorillonite by X - ray Diffraction |
| 投稿时间：2020-09-20 |
| DOI： |
| 中文关键词: 黏土矿物 定量分析 风化作用 |
| 英文关键词:Clay mineral Quantitative analysis Weathering |
| 基金项目:黄土与第四纪国家重点实验室开放基金(SKLLQG1818)。 |
|
| 摘要点击次数: 672 |
| 全文下载次数: 298 |
| 中文摘要: |
| 黏土矿物的组成和含量变化与其形成时的气候、环境密切相关，是重建古环境演化的有效代用指标，因此黏土矿物定性尤其是定量分析显得尤为重要。然而，常用的定量分析方法不能直接应用，且定量分析软件在使用过程中存在误差传导效应。为此，本研究基于X射线衍射分析，针对常见的黏土矿物(蒙脱石、高岭石和伊利石)，建立了两种简便的定量分析方法:一、建立了黏土矿物含量与特征衍射峰面积的定量关系；二、建立了黏土矿物-石英含量比值与特征峰面积比值的定量关系。同时，为检验定量分析方法的可靠性，分析了已知混标和自然风化壳样品。结果表明，定量分析软件对高岭石、石英定量分析结果与真值差异较大(高岭石可达23%，石英则大于9%)，而伊利石定量差值小于5%。相比之下，本文建立的两种方法对蒙脱石定量分析误差较大，但对高岭石、伊利石以及石英的定量分析结果与真值差均小于5%；根据两种定量方法计算化学风化指标——高岭石/伊利石含量比值(Kao/Ill)更加准确、符合客观事实。因此，在实际应用过程中，定量分析软件和本文建立的两种分析方法可共同使用，以提高黏土矿物定量分析准确性。 |
| 英文摘要: |
| The composition and content variety of clay minerals are closely related to the climate and environment at the time of formation, and they are effective proxies to reconstruct the evolution of paleo-environment. Therefore, it is of great important to analyze clay minerals qualitatively, especially quantitatively. However, the commonly used quantitative analysis methods can’t be applied directly, and the quantitative analysis software has error conduction effect in practice. In this study, two simple quantitative analysis methods were established for common clay minerals (montmorillonite, kaolinite and illite) based on X-ray diffraction analysis. First, the quantitative relationships between the content of clay minerals and the area of characteristic diffraction peak were established. Secondly, the quantitative relationships between the content ratio of clay minerals to quartz and the ratio of characteristic peak area were established. And the known mixed standard and natural weathering samples were analyzed to verify the reliability of the quantitative analysis method. The results show that the quantitative analysis results of kaolinite and quartz by the quantitative analysis software differ greatly from the true value (kaolinite can reach 23%, quartz is more than 9%), while the quantitative difference of illite is less than 5%. In contrast, the quantitative analysis errors of montmorillonite by the two methods are large, but the quantitative analysis results of kaolinite, illite and quartz are small, and the difference from the true value is less than 5%. While It is more accurate and truer to calculate the kaolinite/illite content ratio (Kao/Ill) according to the two quantitative methods. Therefore, in the practical application, the quantitative analysis software and the two analytical methods established in this paper can be used together to improve the accuracy of quantitative analysis of clay minerals. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
|
|
|
