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elements in soils
part of elements in the soil environment: their concentrations, speciation, and general behavior
12
Chemistry
Undergraduate 4
01/10/2017

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Term
the stable oxidation states of C
Definition
-IV, 0, II, and IV
Term
the most abundant element in Earth's crust
Definition
O
Term
the 2nd most abundant element in Earth's crust
Definition
Si
Term
the only valence state Si exists in
Definition
IV
Term
the composition of soils is influenced by...
Definition
the soil forming factors, particularly parent material and intensity of weathering (climate and time)
Term
intensity of weathering can depend on...
Definition
climate and time
Term
enrichment ratio (ER)
Definition
this describes the enrichment or depletion of an element in soils relative to the Earth's crust
Term
how to calculate enrichment ratio (ER)
Definition
ER = (median element concentration in soil) / (its mean concentration in the Earth's crust)
Term
enrichment ratios (ER) that show no depletion or enrichment
Definition
between 0.5 and 2

values that lie in this range are not different from ER = 1
Term
enrichment ratios (ER) that show depletion
Definition
less than 0.5
Term
enrichment ratios (ER) that show some enrichment
Definition
between 2 and 10
Term
enrichment ratios (ER) that show strong enrichment
Definition
above 10
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