Types of soil colloids
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layer silicate clays, Fe and Al oxide clays, allophane, humus
Nonacid (basic) cations
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Ca2+, Mg2+, K+, Na+
Allophane
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-volcanic
-poorly crystalline
-glassy, waxy, may be associated with Cu
isomorphic substitution creates a ___ charge when _________.
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negative; weathering occurs
Hematite formula
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Fe2O3
Weight and charge of Ca
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40g/mol; 2+
A(anion)EC
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most soils have some. contributes to phosphate retention
a pH of 5.0 is ____ times more acidic than a pH of 7.0
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100
How to find ECEC
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Do CEC process but don't measure the NH4 collected. Instead, find
individual amts of Ca, Mg, K, & Na from first filtering. Then extract with
unbuffered salt solution (KCl) and analyze for Al & H content.
H > charge and weight
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+; 1g
mechanism that controls soil pH when pH is 2-4
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layer silicate clays, Fe and Al oxide clays, allophane, humus
Nonacid (basic) cations
Give this one a try later!
Ca2+, Mg2+, K+, Na+
Allophane
,Give this one a try later!
-volcanic
-poorly crystalline
-glassy, waxy, may be associated with Cu
isomorphic substitution creates a ___ charge when _________.
Give this one a try later!
negative; weathering occurs
Hematite formula
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Fe2O3
Weight and charge of Ca
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40g/mol; 2+
A(anion)EC
, Give this one a try later!
most soils have some. contributes to phosphate retention
a pH of 5.0 is ____ times more acidic than a pH of 7.0
Give this one a try later!
100
How to find ECEC
Give this one a try later!
Do CEC process but don't measure the NH4 collected. Instead, find
individual amts of Ca, Mg, K, & Na from first filtering. Then extract with
unbuffered salt solution (KCl) and analyze for Al & H content.
H > charge and weight
Give this one a try later!
+; 1g
mechanism that controls soil pH when pH is 2-4
