Lecture 5
Mineralogy and Colloids

Table of Contents

Tonight

Lecture 5 - Mineralogy and Colloids

Sand properties

Silt properties

Physical properties of silt

Soil Colloids

Importance of Soil Colloids

Properties of Soil Colloids

Minerals vs Soil Age

Minerals vs Soil Age

Weathering Sequence

Weathering Impacts

Weathering Minerals graphic

Arrangements of particles in an aggregate

What is clay?

Clay

Clay crystals

Clay crystals

Silicon tetrahedron graphic

Phyllosilicate

Tetrahedral sheet

Octahedral sheet

Isomorphous Substitution

Isomorphous Substitution

Isomorphous Substitution

Permanent charge

Charge characteristics

Cation exchange capacity

Cation exchange

Cation exchange

Cation exchange

Adsorbed cations

Lyotrophic Series

Distribution of cations and anions

Flocculation of clays

Cation and anion exchange

Weathering of mica

1:1 and 2:1 layers

Structure of kaolinite

Structure of montmorillonite

Swelling clay

Surface area of clay

Effect of surface area

Structure of montmorillonite

Structure of illite

Comparative properties

Amorphous mineral materials

Iron and aluminum oxides

Impact of soil pH on net charge

Organic matter

Humic substance

Organic molecules

Structure of a modle humic acid

Charge on clay and OM

Fixed and exchangeable ions

CEC

CEC example

Basic and Acidic cations

Base Saturation

Base Saturation Calculation

%Base Saturation example

Next week

Email: ecolson@ualberta.ca

Home Page: http://www.environment.ualberta.ca/SoilsERM/lectures/index.html

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Lecture 5: - Mineralogy and Colloids

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