Soil review Complexity of soils Intensity and capacity concepts

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Presentation transcript:

Soil review Complexity of soils Intensity and capacity concepts Weathering Florida soils Collected from over a dozen books

Decontaminating Contaminating PbO Pb(OH)2 PbCO3 Minerals of different solubility: which one controls? The least soluble controls the solubility-then we don’t have to worry since nature takes care of itself? Kinetics & dynamics: N2NH3 Pump and treat: Intensity factor: elemental concentration in soil solution Capacity factor: ability of solid phases in soils to replenish depleted elements in solution Lindsay (1979)

Interactions between soil components and compartments: dynamic disequilibria in soils What determine the metal concentrations in soils?? Kabata-Pendias and Pendias (1992)

Familiar with logK, written as dissolution, metal concentrations are really low, similar to pH Read activity-pH graph, Increase SO4 reduce Pb, then keep adding more, think about total soluble Pb Take a sample, analyze Pb2+ conc, close PbCO3, but see Pb(OH)2? Lindsay (1979)

Essington, M.E. 2003. Soil and Water Chemistry. CRC Press. Google book Mn and CrIII oxidation

Ross, 1994 Which is the dominant specie in a typical soil? Metals are generally less soluble at higher oxidation states Why pH dependent?? Ross, 1994

Fig. 2.1 Equilibrium redox relationships of aqueous systems. The inscribed area is representative of most soils pH 5 CrVI CrIII MnIII MnII FeIII FeII CuII CuI HgII HgI MnIV pH 8 pH: 4 to 9 pe: -4 to 12 Eh: -0.3 to 0.7 v Pe = 16.9 E In soils, Cr occurs predominately in the +3 and +6 oxidation states. HW: figure out the dominant redox species of these elements in typical soils. Kinetics, intensity and capacity Lindsay (1979)

http://sce.uhcl.edu/zhang/3431_04S/07_Redox.ppt

http://sce.uhcl.edu/zhang/3431_04S/07_Redox.ppt

http://sce.uhcl.edu/zhang/3431_04S/07_Redox.ppt