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An Assessment of Environmental and Solution Parameter Impact on Trace-Metal Sorption by Soils

^a Dep. of Natural Resources, Univ. of New Hampshire, Durham, NH 03824
^b CSIRO Division of Land and Water, Private Mail Bag No. 2, Adelaide, South Australia 5064

View larger version (12K): [in a new window]   Fig. 1. Change in net charge (C) per mole of added P (P) as a function of pH in an oxisol and an inceptisol from Fiji (after Naidu et al., 1990).

View larger version (14K): [in a new window]   Fig. 2. Effect of NaNO3 ionic strength on cadmium sorption by a variably charged oxisol.

View larger version (18K): [in a new window]   Fig. 3. Effect of index cation on the Cd sorption isotherm for a vertisol and an oxisol.

View larger version (16K): [in a new window]   Fig. 4. Effect of index cation on the Cr sorption isotherm for a xeralf and an oxisol.

View larger version (30K): [in a new window]   Fig. 5. Cadmium, zinc, and copper species distribution as a function of background NaNO3, Na2SO4, or NaCl ionic strength, calculated using MINTEQA2 at pH 7.0 and 10 mmol L-1 M2+, and effect of pH on 10 mmol L-1 Cd2+, Cu2+, and Zn2+ in 0.03 M NaCl.

View larger version (14K): [in a new window]   Fig. 6. Zn2+ sorption by the B horizon of a typic hapuldalf.

View larger version (13K): [in a new window]   Fig. 7. Effect of pH and Cd loading on the proportion of Cd sorbed by a xeralf (after Naidu et al., 1994).

View larger version (18K): [in a new window]   Fig. 8. Effect of low molecular weight organics on Cd sorption by (a) a variably charged oxisol and (b) a permanently charged alfisol, in the presence of NaNO3 at ionic strength of 0.03. Concentration of acetate, oxalate, and citrate was 0.5 mmol L-1, EDTA was 0.01 mmol L-1.

View larger version (13K): [in a new window]   Fig. 9. The effect of temperature on Ni sorption by a paleudult subsoil (Mehadi, 1993).

View larger version (18K): [in a new window]   Fig. 10. Effect of soil/solution ratio on sorption of Cd2+ by (a) a xeralf and (b) an oxisol soil.

View larger version (25K): [in a new window]   Fig. 11. Effect of soil/solution ratio on the desorption of As from As-contaminated soil.

View larger version (11K): [in a new window]   Fig. 12. Relationship between the solution metal ion concentration (C) and the amount of metal ion sorbed (Msurface) during a batch study.

View larger version (15K): [in a new window]   Fig. 13. Relationship between influx (Co) and effluent (Cf) solution metal concentration and the metal ion retained (Msurface) during a column study.