TY - JOUR
T1 - Dye adsorption in a loam soil as influenced by potassium bromide
AU - Allaire-Leung, S. E.
AU - Gupta, Satish C
AU - Moncrief, J. F.
PY - 1999
Y1 - 1999
N2 - FDandC 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, FDandC 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 FDandC Blue 1 and Rhodamine WT on Forman loam was not influenced by the presence of each other. The adsorption of FDandC 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 FDandC 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, FDandC 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.
AB - FDandC 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, FDandC 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 FDandC Blue 1 and Rhodamine WT on Forman loam was not influenced by the presence of each other. The adsorption of FDandC 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 FDandC 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, FDandC 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.
UR - http://www.scopus.com/inward/record.url?scp=0033397999&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0033397999&partnerID=8YFLogxK
U2 - 10.2134/jeq1999.00472425002800060020x
DO - 10.2134/jeq1999.00472425002800060020x
M3 - Article
AN - SCOPUS:0033397999
SN - 0047-2425
VL - 28
SP - 1831
EP - 1837
JO - Journal of Environmental Quality
JF - Journal of Environmental Quality
IS - 6
ER -