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