摘要
本法采用0.5mol/l NH_4Cl-0.5mol/l KCl溶液作交换液,以分光光度法测定粘土的阳离子交换容量。该法适用于测试酸性、碱性、中性的纯粘土矿物、泥页岩和油气层砂岩中粘土的阳离子交换容量。该法不需加碱蒸煮土样,可大大减少粘土中的有机质对测定结果的影响。该法简便、灵敏,测试结果准确。
The clay samples are converted to NH_4^+ -clay and then to K^+-clay in succesive treatments by NH_4Cl and KC1 solutions (0.5mol/l). The NH_4^+ left in the 2nd exchanging solution is combined with Nesseler's reagent to form a soluble product of yellow colour which can be determined readily by measuring the absorbance intensity of the reaction solution at λ_(max)=425nm. The procedures of the determination are presented. In comparative determinations of clay cation exchange capacities by this and another methods,a lot of standard reference materials, clay minerals and clay-containing shale and oily sandstone are tested. This method is shown to be simple, fast, precise, without interference from organic substances, and applicable to all clay samples with different pH values.
出处
《油田化学》
CAS
CSCD
北大核心
1991年第1期46-49,共4页
Oilfield Chemistry
