Soil colloidal chemistry and soil surface reaction

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Chapter 8
Soil colloidal chemistry and soil surface reaction
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Section 1 Soil colloidal surface nature
??Surface types of the soil colloid (?)Siloxane
surface (?)Hydrous oxide surface (?)Organic
matter surface
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??The specific surface area and surface area of
the soil colloid
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The specific surface area of main soils in
China Latosol 60-80m2?g-1 Red
soil 100-150m2?g-1 Yellow brown earth
200-300m2?g-1
(?) Measurement method of the specific surface
area 1?Instrument method 2?Adsorbed method
nitrogen ?glycerine etc.?
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??Surface charge and potential of soil
(?)Cause and categories of the soil charge
1?Permanent charge-The net negative (or
positive) charge of clay particles inherent in
the crystal structure of the particle not
affected by changes in pH or by ion-exchange
reactions.
2?Variable charge- pH dependent charge
Zero point of charge (ZPC)