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Dissolution Kinetics of Heavy Metals in Dutch Carbonate- and Sulfide-Rich Freshwater Sediments

^a National Institute of Public Health and the Environment, P.O. Box 1, 3720 BA Bilthoven, the Netherlands
^b Department of Geochemistry, Institute of Earth Sciences, Utrecht University, P.O. Box 80021, 3508 TA Utrecht, the Netherlands

View larger version (20K): [in a new window]   Fig. 1. pH vs. extraction time at different added HCl concentrations, after a one-time addition of HCl. Method 1: (a) Kromme Rijn, (b) Biesbosch. Dotted lines are duplicates.

View larger version (35K): [in a new window]   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.

View larger version (23K): [in a new window]   Fig. 3. Extracted metal concentrations vs. final pH, Kromme Rijn sediment ( = 24-h extraction, x = 45-min extraction, dry wt. = dry weight)

View larger version (25K): [in a new window]   Fig. 4. Extracted metals vs. final pH, Kromme Rijn compared with Biesbosch for the 45-min extraction ( = Kromme Rijn, = Biesbosch)

View larger version (10K): [in a new window]   Fig. 5. Acid volatile sulfide (AVS) vs. pH for the 45-min extraction time ( = Kromme Rijn, = Biesbosch)

View larger version (11K): [in a new window]   Fig. 6. Simultaneously extracted metals (SEM) to acid volatile sulfide (AVS) ratio vs. pH for the 45-min extraction time ( = Kromme Rijn, = Biesbosch)