Coprecipitation of Ni2+, Co2+, and Mn2+ with galena and covellite, and of Sr2+ with calcite during crystallization via diffusion of H2S and C02 through polyethylene at 20°C: Power law and Nernst law control of trace element partitioning

摘要: Acanthite (Ag2S), calcite (CaCO3), covellite (CuS), galena (PbS), and sphalerite (ZnS) have been crystallized via the diffusion of H2S or CO2 through polyethylene into metal chloride, sulfate nitrate solutions. Coprecipitation experiments show that incorporation Co2+, Ni2+, Mn2+ galena, Ni2+ follows a power function. On other hand, Sr2+ grown at analogous conditions occurs according to Nernst distribution law. It appears free energy for adsorption trace element on surface growing crystal is not necessarily constant but may change as function solute concentration. As either type partitioning yields different fractionation patterns an example given which compares law closed system conditions.