Modelling the effect of salinity on radium desorption from sediments

Details Modelling the effect of salinity on radium desorption from sediments Modelling the effect of salinity on radium desorption from sediments

Jun 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995gecoa..59.2469w&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 59, Issue 12, pp.2469-2476

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Scientific paper

The desorption of the four naturally occurring radium isotopes 223 Ra, 224 Ra, 226 Ra, and 228 Ra from estuarine sediments is investigated. These isotopes are created within sediments by the radioactive decay of insoluble thorium parents. Due to competition from other ions for the occupation of adsorption sites on the sediment grains, radium desorption is a function of salinity. A model is developed to describe radium desorption as it is affected by salinity, grain size, and sediment concentration. It is shown that to model the desorption of radium for a particular sediment requires the estimation of two independent parameters. One of these parameters is the concentration of radium available for exchange on the sediment; the other depends on major ion and radium exchange coefficients. Desorption experiments performed on sediments from the bed of the Bega River, Australia, are used to validate the model and to evaluate the parameters needed for model application.

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