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Chat Four chats before presentation Micphone use is encouraged

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Presentation on theme: "Chat Four chats before presentation Micphone use is encouraged"— Presentation transcript:

1 Chat Four chats before presentation Micphone use is encouraged
Students submit 1 question per lecture every Monday 3 questions/week Pooled and assigned by Tuesday and discussed on Wednesday Your tax is due 35-40 minutes, each has 20 minutes to talk and answer questions

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

3 Kabata-Pendias and Pendias (1992)
Three phases: not concrete solid Concern: Liquid > air > solid Solid phase: organic and inorganic Inorganic-minerals: present as sand, silt and clay Organic: Living phase. Heavier than water? Soil moisture content: volume basis, what about mass basis Density of minerals. Kabata-Pendias and Pendias (1992)

4 Kabata-Pendias and Pendias (1992)
Three phases: not concrete solid Concern: Liquid > air > solid Solid phase: organic and inorganic Inorganic-minerals: present as sand, silt and clay Organic: Living phase. Heavier than water? Soil moisture content: volume basis, what about mass basis Density of minerals. Kabata-Pendias and Pendias (1992)

5 Partition Concern Kabata-Pendias and Pendias (1992)
Three phases: not concrete solid Concern: Liquid > air > solid Solid phase: organic and inorganic Inorganic-minerals: present as sand, silt and clay Organic: Living phase. Heavier than water? Soil moisture content: volume basis, what about mass basis Density of minerals. Kabata-Pendias and Pendias (1992)

6 Absorbed/adsorbed=sorb
Siegel, 2002

7 Spatial variability Spatial changes in Water content: extremely dry still have some water Data were obtained for 35 ground slabs of actual buildings Seasonal changes in water content of subsoil beneath old slab-on-ground structures in Finland

8 Temporal and spatial variability
J.L. Richardson & M.J. Vepraskas (eds) Wetland Soils. CRC Press. Temporal changes in Water content: redox

9 Interactions between soil components and compartments: dynamic equilibria in soils
What determine the metal concentrations in soils?? Organic matter: liming increase Pb concentration? Kabata-Pendias and Pendias (1992)

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

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

12 Intensity and capacity concepts
Metal solubility: mineral Metal speciation: redox Purdue, J.H and W. Patrick, Jr Changes in metal speciation following alteration of sediment redox status. In H.E. Allen (ed) Metal Contaminated Aquatic Sediments. CRC.

13 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)

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