Fig. 2. Spin–spin relaxation time (T₂) values for d₆–benzene (), the benzene ring (-C₆D₅) of d₈–toluene (), and the deuterium of d₅–fluorobenzene () in suspensions of the untreated soil fraction as a function of pH (1:200 soil to solution ratio, 0.01 M NaCl).

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