Hostname: page-component-848d4c4894-wzw2p Total loading time: 0 Render date: 2024-06-01T03:18:16.814Z Has data issue: false hasContentIssue false
  • English
  • Français

Coprecipitation of Sr, Ni and U with CaCO3: An Experimental Study

Published online by Cambridge University Press:  15 February 2011

Torbjörn Carlsson  and
Hannu Aalto
Torbjörn Carlsson
Affiliation:
VTI Chemical Technology, P.O. Box 1404, FIN-02044 VTIT, Finland
Hannu Aalto
Affiliation:
VTI Chemical Technology, P.O. Box 1404, FIN-02044 VTIT, Finland
Get access

Abstract

At the Finnish candidate sites for a nuclear waste repository, calcite (CaCO3) is a common fracture mineral that may participate in coprecipitation processes. The objective of this preliminary work was to study the coprecipitation of the trace elements Sr, Ni, and U with CaCO3 under controlled conditions. The experiments were made in a titration vessel at room temperature under pure N2 or a 0.1 % CO 2/N2 mixture. The water phase contained CaCl2 (0.01M) and NaCl (0.05 M) to which trace amounts of Ni2+, Sr2+ and UO22+ were initially added. CaCO3 was precipitated by the addition of Na2CO3 and the use of CaCO3 seed crystals. When about 10−4 mol of precipitate had formed, the solution and solid phases were analysed with ICPMS. The results seem to indicate that Ni coprecipitated with CaCO3 under the experimental conditions, while U did not. In the case of Sr, further data are needed in order to make any conclusions from the experiments.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 412: Symposium V – Scientific Basis for Nuclear Waste Management XIX , 1995 , 647
Copyright
Copyright © Materials Research Society 1996

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

1 Pitkänen, P., Sneliman, M., Leino-Forsman, H., Nuclear Waste Commission of Finnish Power Companies, Report YJT–94–14, (1994).Google Scholar
2 Grenthe, I., Radiochim. Acta, 52/53, p. 425 (1991).Google Scholar
3 Read, D., Chemval-2 Project Report on Stage 1: ECSC-EC-EAEC, Report EUR 15161 (1993).Google Scholar
4 Bruno, J., Grenthe, I., Munoz, M., Mat. Res. Soc. Symp. Proc. 50, Pittsburgh, PA, 717 (1985).Google Scholar
5 Savage, D., Mat. Res. Soc. Symp. Proc. 353, Pittsburgh, PA, 1159 (1995).Google Scholar
6 Kolthoff, I. and Sandell, E.B., Textbook of Quantitative Inorganic Analysis, Mac Millan, New York, 3rd ed.,1952.Google Scholar
7 Schwarzenbach, G., Complexometric Titrations, Interscience, New York, 1957.Google Scholar
8 Brunauer, S., Emmett, P.H., Teller, E., J. Am. Chem. Soc. 60, 309–319 (1938).Google Scholar
9 Stumm, W., Chemistry of the Solid-Water Interface, Wiley-Interscience, New York, 1991.Google Scholar
10 Wolery, T.J., Lawrence Livermore National Laboratory, Report UCRL-MA- 110662 PT III.Google Scholar
11 Carroll, S.A., Bruno, J., Radiochim. Acta 52/53, p. 187 (1991).Google Scholar