DMSO Intercalation as a Method in the Identification of Kaolinite from Chlorite in Soil Clay Samples

以DMSO層間插入法鑑別土壤黏粒中的高嶺石與綠泥石

張煥正(Huan-Cheng Chang) ； 洪崑煌(Kun-Huang Houng)

《中央研究院化學研究所集刊》 31期 (1984/03) Pp. 31-39

https://doi.org/10.6522/BICAS.1984.31.5

摘要

以恆溫的熱重量分析法估測液體有機分子進入高嶺石層間的重量。實驗結果顯示，DMSO與聯胺二者和高嶺石所形成的複合物分子式皆為A1_4Si_4O_(10)(OH)_8(organic)_(2.0)，即每單位晶格中有二個有機分子。對高嶺石層間插入速率的研究結果顯示DMSO的插入速率很慢，聯胺較快；而高嶺石本身的性質對此作用亦有影響，黏粒部分慢，砏粒部分快。若對黏粒作0.5N NaOH煮沸的前處理，再以含9.1% H_2O（體積百分率）的DMSO溶液進行層間插入作用，則速率加快很多。因此，可以用本法來鑑別土壤黏粒中的高嶺石與綠泥石。

並列摘要

The amount of dimethylsulfoxide (DMSO) and hydrazine (HZ) hydrate intercalated into kaolinite samples were estimated by an isothermal thermogravi-metric method. It was found that nearly 2 molecules of either DMSO or HZ per unit cell of kaolinite would be taken up at full intercalation. The intercalation rate was very slow for DMSO, relatively faster for HZ. It was especially slow for clay fraction than for silt fraction. Pretreating the sample with 0.5 N NaOH and with the use of aqueous DMSO solution containing 9.1% H_2O by volume enhanced the intercalation into clay kaolinite considerably, rendering it possible to be used in the identification of clay kaolinite in the presence of chlorite.