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Sorption of americium in tuff and pure minerals using synthetic and natural groundwaters

Description: The distribution of Am between selected solid and liquid phases has been studied using initial {sup 241}Am solutions with a molarity smaller than 1 {times} 10{sup {minus}11}. The synthetic and natural groundwaters used have pH values in the 7--8 range and a total alkalinity of approximately 1 mN which is mainly due to bicarbonate. Mass spectrometric isotope dilution was utilized to determine the amount of Am in the solution phase initially and after equilibrium was attained. Using this sensitive technique, 7 {times} 10{sup 8} atoms of {sup 241}Am were accurately measured. Our results indicate that the percent of Am lost to the walls of the container in the absence of geologic material varies from 35 to 84. The Am sorption coefficient determined is on the order of 10{sup 3} ml/g for clinoptilolite, 10{sup 4} ml/g for tuff consisting mainly of alkali feldspar and cristobalite, and 10{sup 5} ml/g for romanechite. 12 refs.
Date: December 1, 1989
Creator: Triay, I.R.; Meijer, A.; Cisneros, M.R.; Miller, G.G.; Mitchell, A.J.; Ott, M.A. et al.
Partner: UNT Libraries Government Documents Department