氯化铵-乙醇法测定蛭石的阳离子交换容量

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^-3mol/100 g。

Measurement of the Cation Exchange Capacity of Vermiculite by Ammonium Chloride-Ethanol Method

The cation exchange capacity （CEC） of vermiculite concentrate is measured by ammonium chloride- ethanol method.The results show that vermiculite particles must be sufficiently dispersed and wetted to make the vermiculite interlayer cations entirely exchange with NH4 in ammonium chloride-ethanol solution.The formic acid content must be deducted when NH₄⁺ content is measured by formol titration method.To get accurate results,the titrated solution of ammonium chloride-ethanol 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.