Physics
Scientific paper
Sep 1963
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1963gecoa..27..957h&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 27, Issue 9, pp.957-964
Physics
8
Scientific paper
The coprecipitation of cations with slightly soluble salts can be studied conveniently by the method of precipitation from homogeneous solution. In our experiments aragonite and/or strontianite were precipitated from aqueous solutions between 90-100°C by carbonate ions generated during the hydrolysis of trichloroacetate ions. It was found that surface equilibrium is maintained between solution and precipitate during the precipitation process, and that the distribution of strontium and calcium between solution and precipitate obeys the Doerner-Hoskins equation. The distribution coefficient k Sr A is nearly independent of the NaCl concentration of the solution, but does increase from 0.59 to 0.80 with the strontium content of the aragonite phase. The unit cell dimensions of the solid solution (Ca, Sr)CO 3 increase toward strontianite, but only the a 0 dimension varies linearly with the mol fraction of SrCO 3 . The gap in the unit cell size between strontian aragonite and calciostrontianite at 96°C corresponds to a range of approximately 30 mol per cent SrCO 3 .
Borcsik Maria
Holland Heineich D.
Muñoz Jonathan
Oxburgh U. M.
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