Fig. 2. pH vs. extraction time at different added HCl concentrations, with intermittent HCl additions during the first 1000 min. Method 2: (a) Kromme Rijn, (b) Biesbosch. Dotted lines are duplicates. For 0.60 mol L^-1 the acid was added in 110 and 250 min, respectively, instead of in 1000 min.

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