Fig. 1. Deuterium nuclear magnetic resonance (²H NMR) spectra of d₂–dichloromethane (CD₂Cl₂), d₆–benzene (C₆D₆), d₈–toluene (C₆D₅CD₃) and d₂–water (D₂O) contained at natural abundance in aqueous suspensions of Na–montmorillonite at pH 3.0 and 9.0 (1:200 clay to solution mass ratio, 0.01 M NaCl): (a) d₂–dichloromethane (downfield-shifted) at pH 3; (b) d₂–dichloromethane at pH 9; (c) d₆–benzene (downfield-shifted) at pH 3; (d) d₆–benzene at pH 9; (e) d₈–toluene at pH 3 (C₆D₅– as the most downfield-shifted driblet corresponding to and ß deuterium; CD₃– as the most upfield-shifted); and (f) d₈–toluene at pH 9 (quadrupolar splitting observed for deuterium of C₆D₅– moiety).