sw30 - Exam II is Wednesday, March 3rd Updated study guide...

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Exam II is Wednesday, March 3 rd Updated study guide will be posted Friday Review session will be held on March 1 st in class
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Clay Mineral Properties
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Crystalline silicate clay minerals are assembled from layers comprised of sheet-like structures Silica Tetrahedra Aluminum Octahedra They are joined by sharing oxygen atoms octahedra tetrahedra One Layer
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Layers and Interlayers Interlayer Spaces Layer of tetrahedra and octahedra
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Interlayer Spaces Layer of tetrahedra and octahedra These layers are extremely thin and are stacked together to form clay minerals Stacked Layers
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Much of the reactivity of clay minerals can be related to the interlayer spaces High Surface Area Adsorption of Cations
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Charge on Clay Minerals Negative charge is generated by substitution of lower charge cations for higher charge cations in tetrahedral and octahedral sheets of clay layers Al 3+ for Si 4+ in tetrahedra Mg 2+ for Al 3+ in octahedra Negative charge is satisfied by ions in soil solution
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- - - - - - - - - - - - - - - Charged Surface Na + Na + Na + Na + Na + Na + Na + Na + Na + Na + Na + Na + Na + Na + Na + Na + Na + Na + Na + Na + Na + Na + Na + Na + Na + Na + Na + Na + Na + Na + Na + Na + High cation concentration Ambient solution concentration Decreasing concentration Na + Na +
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Implications for Fertility Important Cations : H + , Ca 2+ , Mg 2+ , Zn 2+ , Mn 2+ , K + , NH 4 + , Cu 2+ reserve Ca 2+ Mg 2+ Zn 2+ Cu 2+
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Ca 2+ Ca 2+ Ca 2+ Ca 2+ Na + K + K + K + K + K + Na + K + Na + Na + Na + Root H + H + H + H +
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Negative charge sites can also intercept cationic contaminants Methylene Blue + Organic cations tend to be strongly held at mineral surfaces
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Cation Preference at Charged Sites 1. Concentration 2. Charge (+1, +2,+3) 3. Size
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sw30 - Exam II is Wednesday, March 3rd Updated study guide...

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