121-9 Anion Exchange Characteristics in a Loess Soil.

Poster Number 1017

See more from this Division: S02 Soil Chemistry
See more from this Session: General Soil Chemistry
Monday, October 22, 2012
Duke Energy Convention Center, Exhibit Hall AB, Level 1
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Jessica L. Ottinger, Biosystems Engineering & Soil Science, University of Tennessee, Knoxville, TN, Donald Tyler, The University of Tennessee, Jackson, TN and Michael Essington, Biosystems Engineering and Soil Science, University of Tennessee, Knoxville, TN
Loess soils of west Tennessee have been found to contain large amounts of subsoil Fe-oxides that retain and restrict the movement of conservative anions, such as nitrate and bromide. Concentrated levels of Fe-oxides, and accumulated anion concentrations, are located in the argillic horizons (30 to 46 cm depth) and in the underlying tertiary sands (220 cm depth). This study examined anion exchange characteristics of binary and ternary nitrate, sulfate, and chloride systems in the high Fe-oxide horizons of the loess soils. Exchange isotherms indicate that both chloride and nitrate are preferred by the soil anion exchange complex relative to sulfate, where preference is defined by a Vanselow selectivity coefficient that is greater than 1. The isotherms also show that the soil exchanger phase prefers chloride relative to nitrate. These findings enhance our understanding of how the addition of flue-gas desulfurization (FGD) gypsum will potentially affect anion dynamics in loess soils of west Tennessee.
See more from this Division: S02 Soil Chemistry
See more from this Session: General Soil Chemistry