HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Allaire-Leung, S. E. Articles by Moncrief, J. F. Search for Related Content PubMed Articles by Allaire-Leung, S. E. Articles by Moncrief, J. F. Agricola Articles by Allaire-Leung, S. E. Articles by Moncrief, J. F.

Dye Adsorption in a Loam Soil as Influenced by Potassium Bromide

Dep. of Environmental Sciences, Univ. of California, Riverside, CA 92521;

S. C. Gupta and J. F. Moncrief

Dep. of Soil, Water, and Climate, Univ. of Minnesota, St. Paul, MN 55108.

^* Corresponding author (sleung{at}ussl.ars.usda.gov).

ABSTRACT

FD&C Blue #1 and Rhodamine WT have been used in soils to trace preferential flow paths while bromide has been used to study flow paths of water or nonretarded chemicals. This study quantified the interactions of KBr, FD&C Blue #1, and Rhodamine WT on dye adsorption in Forman loam (fine-loamy, mixed Udic Argiboroll) soil. The experiment involved characterization of adsorption isotherms and breakthrough curves for various mixtures of tracers at different concentrations. Batch equilibration studies showed that the adsorption of FD&C Blue #1 and Rhodamine WT on Forman loam was not influenced by the presence of each other. The adsorption of FD&C Blue #1 and Rhodamine WT, however, increased with an increase in the concentration of KBr. The slope of linear adsorption isotherm (K_d) increased from 5.0 to 15.0 cm³ g^–1 for FD&C Blue #1 and from 4.2 to 5.0 cm³ g^–1 for Rhodamine WT on addition of 1000 mg L^–1 of KBr. In a flow-through experiment, FD&C Blue #1 movement was twice as slow in presence of KBr than in absence of KBr. The K_d values from the flow-through experiment were lower than those from the batch equilibration experiments. We conclude that the retardation coefficients estimated from the batch equilibration studies are not realistic for application to leaching experiments, and the presence of tracer interaction can potentially complicate the interpretation of dye flow patterns observed with the use of multiple tracer technique.

This article has been cited by other articles:

				L.A. Gaston and M.A. Locke Differences in Microbial Biomass, Organic Carbon, and Dye Sorption between Flow and No-Flow Regions of Unsaturated Soil J. Environ. Qual., July 1, 2002; 31(4): 1406 - 1408. [Abstract] [Full Text] [PDF]