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Temperature and Microbial Activity Effects on Trace Element Leaching from Metalliferous Peats

^a Department of Biological and Environmental Engineering, Riley-Robb Hall, Cornell University, Ithaca, NY 14853
^b Department of Crop and Soil Sciences, Bradfield Hall, Cornell University, Ithaca, NY 14853

View larger version (38K): [in a new window]   Fig. 1. Cumulative respiration (mg carbon mineralized per gram peat solids) for both initial and leached M3 and M7 peat soils. Error bars represent ±1 standard deviation.

View larger version (31K): [in a new window]   Fig. 2. Leachate pH as a function of time and incubation temperature. Dashed lines indicate peat soil pH, dotted lines indicate rainfall pH. For this and similar figures, cumulative time (incubation plus leaching) is plotted on the x axis, with the composited Week 3 + 4 sample plotted midway between the Week 3 and 4 leachings.

View larger version (35K): [in a new window]   Fig. 3. Leachate total S, NO3–N, and dissolved organic carbon (DOC) concentrations as a function of time and incubation temperature.

View larger version (26K): [in a new window]   Fig. 4. Leachate Zn, Ni, and As concentrations as a function of time and incubation temperature for M7 acidic peat.

View larger version (25K): [in a new window]   Fig. 5. Leachate Zn, Ni, and As concentrations as a function of time and incubation temperature for M3 neutral peat.

View larger version (28K): [in a new window]   Fig. 6. First cycle leachate concentrations of total S, dissolved organic carbon (DOC), and Zn as a function of initial cumulative respiration. Correlation coefficients (r2) are from linear regressions.

View larger version (26K): [in a new window]   Fig. 7. Leachate Zn concentrations as a function of leachate pH and dissolved organic carbon (DOC) concentration for (a) M7 acidic peat and (b) M3 neutral peat.