氯化铵-乙醇法测定蛭石的阳离子交换容量
Measurement of the Cation Exchange Capacity of Vermiculite by Ammonium Chloride-Ethanol Method
-
摘要: 采用氯化铵-乙醇法测定了蛭石精矿的阳离子交换容量.实验结果表明:氯化铵-乙醇法测定蛭石精矿的阳离子交换容量时,必须使蛭石充分润湿分散,以利于NH4 与蛭石层间阳离子的充分交换.甲醛法滴定NH4 含量时,必须消除甲酸的影响,并且不加热待滴定液可以获得较准确的测试结果.实验测得蛭石精矿的阳离子交换容量为60.8824×10-3 mol/100 g.Abstract: The cation exchange capacity (CEC) of vermiculite concentrate is measured by ammonium chlorideethanol method. The results show that vermiculite particles must be sufficiently dispersed and wetted to make the vermiculite interlayer cations entirely exchange with NH+4 in ammonium chlorideethanol solution. The formic acid content must be deducted when NH+4 content is measured by formol titration method. To get accurate results, the titrated solution of ammonium chlorideethanol should not be heated before it is titrated with NaOH standard solution. The measured CEC of vermiculite concentrate is 60.8824×10-3 mol/100 g.
下载: