Effects of calcium and magnesium on strontium distribution coefficients |
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Authors: | R L Bunde J J Rosentreter M J Liszewski C H Hemming J Welhan |
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Institution: | (1) U.S. Geological Survey, P. O. Box 2230, Idaho Falls, Idaho USA 83403, US;(2) Idaho State University, Chemistry Department, Pocatello, Idaho USA 83209, US;(3) Idaho Geological Survey, Idaho State University, Pocatello, Idaho USA 83209, US |
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Abstract: | The effects of calcium and magnesium on the distribution of strontium between a surficial sediment and simulated wastewater
solutions were measured as part of an investigation to determine strontium transport properties of surficial sediment at the
Idaho National Engineering Laboratory (INEL), Idaho. The investigation was conducted by the U.S. Geological Survey and Idaho
State University, in cooperation with the U.S. Department of Energy. Batch experimental techniques were used to determine
strontium linear sorption isotherms and distribution coefficients (K
d's) using simulated wastewater solutions prepared at pH 8.0±0.1 with variable concentrations of calcium and magnesium. Strontium
linear sorption isotherm K
d's ranged from 12±1 to 85±3 ml/g, increasing as the concentration of calcium and magnesium decreased. The concentration of
sorbed strontium and the percentage of strontium retained by the sediment were correlated to aqueous concentrations of strontium,
calcium, and magnesium. The effect of these cation concentrations on strontium sorption was quantified using multivariate
least-squares regression techniques. Analysis of data from these experiments indicates that increased concentrations of calcium
and magnesium in wastewater discharged to waste disposal ponds at the INEL increases the availability of strontium for transport
beneath the ponds by decreasing strontium sorption to the surficial sediment.
Received: 8 November 1996 · Accepted: 6 January 1997 |
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Keywords: | Strontium Calcium Magnesium Distribution Distribution coefficient Kd Competing cations |
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