A study on the nature of clay
1935
Roborgh, R.H.J.
The study was intended to elucidate by HCl extraction the composition of that part of the clay fraction, essential for adsorption phenomena in the soil and also its resistance to attack by HCl.HCI extraction of 12 alluvial clay soils did not indicate the composition of the adsorption complex, as the analyses of the HCl extracts showed very different values for the composition of the Al-Fe-Si-complexes which were brought into solution, whereas the values for adsorption and residual adsorption showed that the chemical composition of the adsorptive parts of the clay fraction < 2μof the different soils was uniform.The uniformity of the clay fractions of the 12 soils in adsorption capacity, behaviour towards HCl extraction and the influence of this extraction on adsorption values suggested that the soils could be of the same mineralogical origin. However total analyses of the clay fraction yielded divergent SiO 2 : Al 2 O 3 and SiO 2 : sesquioxide ratios for the different soils.Therefore it was supposed that only the films of the hydrolytic products of the minerals present in clay were identical.
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