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Soil Chemistry

Soil Chemistry - 1 Soil Chemical Properties Chapters 8 and...

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1 1 Soil Chemical Properties Chapters 8 and 9 Mineral Photos from Roth, 2000, Images from Minerals in Soil Environments, published by Soil Science Society of America 2 Colloids < 0.002 mm in diameter Minerals and organic particles Very high surface area Many are charged, permanent and variable Usually negative charge Sometimes positive charge Adsorb water (adhesion) 3 Types of soil colloids Crystalline silicate clays = layer silicates • Oxides Poorly crystalline minerals • Humus 4 Kaolinite 5 Smectite 6 Oxides Contain O and/or OH Fe, Al types most common (also Mn) Variable charge • Nonexpanding Very common in highly weathered soils Fe oxides – yellow, red Al oxides – white, gray Mn oxides – black 7 Iron Oxides - Goethite FeOOH 8 Iron Oxides - Hematite Fe 2 O 3 9 Aluminum Oxides - Gibbsite Al(OH) 3
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