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Metal Release from Bottom Sediments of Ocoee Lake No. 3, a Primary Catchment Area for the Ducktown Mining District

^a Dep. of Earth System Science, Yonsei Univ., Seodaemun-gu, Shinchon-dong 134, Seoul, 120-749, Korea
^b School of Earth Sciences, 125 S. Oval Mall, Ohio State Univ., Columbus, OH, 43210
^c School of Environment and Natural Resources, 210 Kottman Hall, Ohio State Univ., Columbus, OH, 43210-1085
^d Environmental Sciences Div., EPA NERL, Research Triangle Park, NC, 27711

View larger version (19K): [in this window] [in a new window]   Fig. 1. Sample collection sites for Ocoee Lake No. 3 bottom sediments. Samples were provided by the USEPA, whose personnel collected the samples and identified their locations using global positioning system coordinates.

View larger version (28K): [in this window] [in a new window]   Fig. 2. Acid-soluble fractions in different acid-leaching schemes using the fine fraction (<125 mm) of sample DS 9. (A) Comparison of acid-soluble fractions (g 100 g–1) from different amounts of sediment (1 g vs. 5 g) in the same volume (50 mL) of acid. (B) Comparison of acid-soluble fractions (g 100 g–1) from the same amount of sediment in different concentrations (2 mol L–1 vs. 6 mol L–1) of acid. (C) Comparison of amounts of metals (mg g–1) released by different concentrations (2 mol L–1 vs. 6 mol L–1) of acid.

View larger version (60K): [in this window] [in a new window]   Fig. 3. Grain size distributions of the bottom sediments (0- to 5-cm depth) from Ocoee Lake No. 3. Samples DS16, -17, and -18 contained anomalously high amounts of sediment grains larger than 500 µm.

View larger version (13K): [in this window] [in a new window]   Fig. 4. Changes in pH of sediment suspensions in the lake water after the addition of varying amounts of 6 mol L–1 HCl. The amounts of acid added are reported in Table 3.

View larger version (17K): [in this window] [in a new window]   Fig. 5. Amounts of metals released from the lake sediment by acidification.

View larger version (13K): [in this window] [in a new window]   Fig. 6. The relationship between total metal ions released (by charge) from the sediment and protons consumed during acidification.

View larger version (8K): [in this window] [in a new window]   Fig. 7. Changes in the chemical composition of the water of Ocoee Lake No. 3 through release of metals from the sediment in contact with the water as a result of acidification. Numbers on adjacent data points indicate the final pH of the solution after acidification. Arrows indicate the direction of progressive changes in the chemical composition of the solution. (A) Chemical composition of the solution expressed in the relative abundance of dissolved Fe versus Al versus Mn. (B) The relative abundance of dissolved Pb versus Cu versus Zn.