Study of the dynamic equilibrium in the BaSO 4 and PbSO 4 /aqueous solution systems using 133 Ba 2+ and 210 Pb 2+ as radiotracers

Details Study of the dynamic equilibrium in the BaSO 4 and PbSO 4 /aqueous solution systems using 133 Ba 2+ and 210 Pb 2+ as radiotracers Study of the dynamic equilibrium in the BaSO 4 and PbSO 4 /aqueous solution systems using 133 Ba 2+ and 210 Pb 2+ as radiotracers

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993gecoa..57.4435p&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 57, Issue 18, pp.4435-4444

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Scientific paper

The transport of cations implicated in the National Uranium Tailings Project source model for the geochemical control of 226 Ra have been investigated under equilibrium conditions with the aid of 133 Ba 2+ and 210 Pb 2+ as radiotracers. The rates of the isotopic exchange between BaSO 4 and PbSO 4 and their respective saturated solutions appear to exhibit a fast, followed by a slow component. These data permit an estimate of the transport rate constants to be made. It was found that the rate of these exchange processes is retarded by the presence of other ions. In contrast, the crystallographic nature of the faces did not have a large effect on the exchange rate. It was noted that equilibrium (exchange) and nonequilibrium (crystal growth) experiments yield different information about the interfacial kinetics. The rate constants which play the key role in crystal growth are believed to be determined largely by the dehydration of cations, whereas the rate constants for exchange are more likely to be a measure of the activation energy needed in order to break bonds in the solid phase.

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