Agriculture Reference
In-Depth Information
Some oxyanions are soluble in the soil solution and readily move in soil,
whereas other oxyanions are immobile and do not move in soil. In some cases
species of interest may be combined into new compounds such as to be readily,
slowly, or nonavailable to plants.
PROBLEMS
10.1.
Give some examples of anions including oxyanions that are common
in soil.
10.2.
Give examples of cations including oxy and hydroxy cations common
in soil.
10.3.
Write reactions that illustrate how metal cations can lead to the release
of protons into the soil solution.
10.4.
Illustrate solution, cation exchange, and outer-sphere and inner-sphere
species around a soil particle.
10.5.
Compare the reactivity and movement of nitrogen and phosphate
oxyanions in soil.
10.6.
Explain why the occurrence of colloidal species is important in the
analysis of soil for other species.
10.7.
Compare the characteristics of manganese and iron in soil, and describe
their similarities and differences.
10.8.
What special roles do carbonate and bicarbonate play in the chemistry
of soil?
10.9.
Explain why analysis of soil for chromate
+
6 (Cr
6+
) species is generally
not an enlightening analysis.
10.10.
Diagram the compartments in the soil environment and the movement
of species between these compartments.
BIBLIOGRAPHY
Allen HE, Huang CP, Bailey GW, Bowers AR (eds.).
Metal Speciation and Contami-
nation of Soil
. Ann Arbor, MI: Lewis Publishers, 1995.
Bohn HL, McNeal BL, O'Connor GA.
Soil Chemistry
, 3rd ed. New York: Wiley, 2001.
Gimpel J, Zhang H, Davison W, Edwards AC. In situ trace metal speciation in lake
waters using DGT, dialysis and filtration.
Environ. Sci. Technol
.
37
:138-146, 2002.
Lindsay WL. Inorganic phase equilibria of micronutrients in soil. In
Micronutrients in
Agriculture
, Mortvedt JJ, Giordano PM, Lindsay WL (eds.). Madison, WI: Soil
Science Society of America. 1972.
