Adsorption of Polycations on Clays: A Comparative in situ Study Using 133Cs and 23Na Solution Phase NMR.

23Na solution phase NMR has been evaluated as an in situ probe to study the adsorption of tetramethylammonium (TMA+) and two polycations, FL17 ([(Me2NCH2CHOHCH2)n]n+Cln) and Magnafloc 1697, ([(CH2CHCH2N(Me)2CH2&Cmacr;HCH2)n]n+Cln), onto clays in aqueous suspensions containing 2.5 mass% low iron Texas bentonite. The NMR data shows the effectiveness of the organocations at displacing Na+ from the bentonite surface.