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Fig. 4. Spin–spin relaxation time (T2) values for the {alpha} and ß deuterium of d5–fluorobenzene in suspensions of the untreated soil fraction and the soil fraction treated with NaOH as a function of pH (1:200 soil to solution ratio, 0.01 M NaCl). {diamond} {alpha} d5–fluorobenzene for untreated soil; {square} ß d5–fluorobenzene for untreated soil; {diamondsuit} {alpha} d5–fluorobenzene for treated soil; {blacksquare} ß d5–fluorobenzene for treated soil.