The coprecipitation of cations with CaCO 3 --II. The coprecipitation of Sr +2 with calcite between 90° and 100°C

Details The coprecipitation of cations with CaCO 3 --II. The coprecipitation of Sr +2 with calcite between 90° and 100°C The coprecipitation of cations with CaCO 3 --II. The coprecipitation of Sr +2 with calcite between 90° and 100°C

Aug 1964

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1964gecoa..28.1287h&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 28, Issue 8, pp.1287-1301

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Scientific paper

CaCO 3 can be precipitated by the slow introduction of CO 2 into initially CO 2 -free ammoniacal CaCl 2 solutions or by the slow release of CO 2 from ammoniacal CaCl 2 solutions which were initially in equilibrium with a vapor containing a high CO 2 pressure. Normally, calcite is the only or dominant polymorph of CaCO 3 in the precipitate, but aragonite may be present in small and occasionally in large amounts. The distribution of Sr +2 between solution and precipitate in calcite and aragonite has been measured in precipitates prepared by both the CO 2 introduction and CO 2 release technique. The results are comparable. The value of the distribution coefficient k c Sr of Sr +2 between solution and calcite was found to be 0.076 ± 0.006. The distribution coefficient k A Sr of Sr +2 between solution and aragonite could not be measured precisely, but the values obtained are compatible with that reported in a previous paper (0.59 ± 0.02). The value of k c Sr is independent of both the ionic strength of the solution up to 1.4 m and of the mol fraction of Sr +2 in solution. It is probably also nearly independent of the NaCl concentration in the solutions from which it is precipitated. The value reported here can therefore be used to define the ratio ( m Sr +2 / m Ca +2 ) in hydrothermal solutions from which calcite has been deposited at 100°C.

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