The crystallization of calcite from aqueous solutions and the role of zinc and magnesium ions—I. Precipitation of calcite in the presence of Zn2+ ions
Identifieur interne : 000C03 ( Main/Exploration ); précédent : 000C02; suivant : 000C04The crystallization of calcite from aqueous solutions and the role of zinc and magnesium ions—I. Precipitation of calcite in the presence of Zn2+ ions
Auteurs : Abraham Glasner [Israël] ; Dalia Weiss [Israël]Source :
- Journal of Inorganic and Nuclear Chemistry [ 0022-1902 ] ; 1979.
Abstract
When calcium chloride and ammonium carbonate solutions in the 10−1–10−2 M range are mixed a definite proportion of the CaCO3 is spontaneously precipitated as calcite; the rest is held in solution as small aggregates of the “soluble” polymorphs. The latter convert on ageing into calcite nuclei.Zn2+ ions added to mixture partially coprecipitated. Comparatively large amounts of Zn2+ ions in the mixture hinder the crystallization of calcite and simultaneously some hydrozincite is precipitated. When (NH4)2CO3 is allowed to diffuse into CaCl2 solutions containing Zn2+ ions, however, the Zn2+ ions are coprecipitated completely with the calcite.The phenomenological results are interpreted by the primary formation of the carbonato-complex [Zn(CO3)2]2− ions which serve as centres of nucleation for the calcite crystallization.
Url:
DOI: 10.1016/0022-1902(80)80210-7
Affiliations:
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