Chapter 2 Inorganic Solids in Soil. Soil Chemistry includes: Components of soil Inorganic (soil minerals, salts, metals) Organic (aggregates, humus,
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Post on 20-Dec-2015
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- Chapter 2 Inorganic Solids in Soil
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- Soil Chemistry includes: Components of soil Inorganic (soil minerals, salts, metals) Organic (aggregates, humus, plant residues) Solution Gases Processes important to plant growth and environmental applications Ion exchange capacity Sorption/Complexation
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- Composition Soils are: porous open systems (to atmosphere, hydrosphere, biosphere) multi-component products of weathering dynamic, constantly changing, not static
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- Soil Solids >90% solids are inorganic in most soils. USDA major size fractions used by soil scientists in U.S.: clay (
- Common elements O and Si are two most common elements by weight and volume O > Si >>> Al > Fe >> C, Ca, Mg, K, Na aluminosilicates and silicates minerals that are made up of Si-O-Al and Si-O molecular framework
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- Essential and toxic ions Macronutrients: H, C, N, O, Mg, P, S, K, Ca Animals also need Na, Cl Micronutrients: B, Cl, V, Mn, Fe, Cu, Zn, Mo Animals also need F, Si, Cr, Ni, Co, As, Sn, Se, I The list changes with progress in experimental techniques
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- Nutrients in plants and animals Light atomic weight, concentrated at earths surface (heavier metals form the core of earth). Evolution took advantage of elements abundant at the surface. Plants can tolerate a much wider range of mineral concentrations than animals. Chemical spatial variability of soils causes variations in mineral concentrations of plants animals should eat a variety of plants and plants grown on different soils.
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- Minerals in Soil as Sources of Elements and Ions Mineral: "natural, inorganic homogenous compound with definite chemical composition and ordered atomic arrangement
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- http://www.chem.wisc.edu/~newtrad/CurrRef/BDGTopic/lab/Crystlab.html Examples of ionic crystalline solids
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- Unit Cell Smallest repeating 3-D array of atoms in a crystal. Minerals are often reported in half-cell formulas for simplification be aware! Ex: Kaolinite Unit cell = Si 4 Al 4 O 10 (OH) 8 Half-cell = Si 2 Al 2 O 5 (OH) 4
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- http://www.gly.fsu.edu/~salters/GLY1000/6_Minerals/6_Minerals_index. html
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- http://gpc.edu/~pgore/myart/silicate.gif science.kennesaw.edu/.../silicon/sil1cone.htm
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- Soil clay minerals Silica Tetrahedrons one building block of soil minerals Crystal pictures are from Bob Harter at Univ. of New Hampshire http://pubpages.unh.edu/~harter/crystal.htm#2:1%20MINERALS
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- Figure 1: Single silica tetrahedron (shaded) and the sheet structure of silica tetrahedrons arranged in a hexagonal network. http://www.britannica.com/ebc/article-80127
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- Aluminum Octahedrons another building block or layer in minerals
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- Single octahedron (shaded) and the sheet structure of octahedral units. http://www.britannica.com/ebc/article-80127
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- Various linkages of the tetrahedra create classes of silicates: www.indiana.edu/~geol116/ week2/sillmin.jpg www.winona.edu/geology/MRW/minrx.htm
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