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.
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