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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).
