Experiments on the simultaneous partitioning of divalent metal ions between hedenbergite or tremolite and 2M aqueous chloride solutions under supercritical conditions

Etsuo Uchida, Junichi Uekusa, Tasuku Kataoka

    Research output: Contribution to journalArticle

    Abstract

    Experiments on the simultaneous exchange of Ni2+, Mg2+, Co2+, Zn2+, Fe2+, Mn2+, Ca2+ and Sr2+ between hedenbergite or tremolite and 2M aqueous chloride solutions were carried out in the temperature range of 500 to 800°C, 1 kb. The PC-IR curves for the both minerals show a similar shape and have peaks near Ni2+ and Ca2+. The former peak corresponds to 6 coordination and the latter peak to 8 coordination. The PC-IR curves suggest that Ni2+, Mg2+ and Fe2+ are partitioned preferably in 6 coordination of the minerals and Mn2+, Ca2+ and Sr2+ in 8 coordination. However Co2+ and Zn2+ deviate from such a trend. The ion selectivity decreases with increasing temperature.

    Original languageEnglish
    Pages (from-to)233-241
    Number of pages9
    JournalJapanese Magazine of Mineralogical and Petrological Sciences
    Volume34
    Issue number5
    DOIs
    Publication statusPublished - 2005

    Keywords

    • Aqueous chloride solution
    • Hedenbergite
    • Partition coefficient
    • PC-IR diagram
    • Supercritical condition
    • Tremolite

    ASJC Scopus subject areas

    • Geochemistry and Petrology
    • Economic Geology

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