SSSAJ -- Zhu et al. 67 (5): 1370 Figure IG4

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Fig. 4. ²H nuclear magnetic resonance (NMR) spectra of d₅–pyridine and deuterated water at natural abundance (the most upfield-shifted peak) in aqueous suspensions of untreated and NaOH-treated WDCs at different pH values. (a) untreated at pH 4 ( ${alpha}$ , ß, and water). (b) untreated at pH 6 (unresolved ${alpha}$ , ß, and water). (c) untreated at pH 7 (unresolved ${alpha}$ , ß, and water). (d) untreated at pH 9 ( ${alpha}$ , ${gamma}$ , ß, and water). (e) treated at pH 4 ( ${alpha}$ , ß, and water). (f) treated at pH 6 ( ${alpha}$ , ß, and water). (g) treated at pH 7 ( ${alpha}$ , ß, and water). (h) treated at pH 9 ( ${alpha}$ , ${gamma}$ , ß, and water).