Answer to Question #124005 in Analytical Chemistry for Qwerk

Question #124005

Explain why humus have higher cation exchange capacity (CEC= 200 to 400 cmol+/kg) than montmorillonite (CEC = 80 to 100 cmol+/kg).


1
Expert's answer
2020-07-06T06:40:37-0400

Humus is a colloidal substance enriched in organic matter. These organic colloids have relatively large quantities of negative charges that are higher compared to montmorillonite represented by silicon-enriched mineral. As humus is more negatively charged, it can bind a higher number of cations resulting in higher cation exchange capacity than montmorillonite.


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