Pure calcium carbonate (calcite and aragonite) solid materials of different particle size (100-200μm fragments and millimeter-sized single crystals) were interacted with Pb in aqueous solutions at room temperature under atmospheric P{sub}(CO{sub}2). In the case of the micrometer-sized samples, the macroscopic investigation using a batch-type treatment procedure (solutions between 10 and 1000 mg/L Pb) and ICP-AES, SEM-EDS, and powder-XRD showed that the metal is readily removed from the aqueous media by both materials and indicated the sorption processes (mainly surface precipitation leading to overgrowth of cerussite and hydrocerussite crystals) taking place in parallel with surface dissolution processes. The various processes occurring at the calcium carbonate solid-water interface were clearly distinguished and defined in the case of the millimeter-sized samples interacted with 1000 mg/L Pb using a combination of wet-chemical, in-situ (AFM) and ex-situ (AFM, SEM) microscopic, and surface spectroscopic (XPS, 12{sup left}C-RBS) techniques. The in-situ AFM data revealed the dissolution processes on the surface of the calcium carbonates and the simultaneous heterogeneous nucleation of lead carbonate phases and confirmed the secondary dissolution of lead carbonate crystals grown epitaxially from the initial nuclei. The XPS spectra confirmed that adsorption of Pb occurs simultaneously to dissolution at short interaction times (less than ～10 min, prior to precipitation-nucleation/crystal growth) in the case of both CaCO{sub}3 polymorphs and that the calcite surface with adsorbed Pb may have an aragonite-type character. The 12{sup left}C-RBS spectra indicated that absorption (incorporation of Pb{sup}(2+) ions) also takes place in parallel at the surface layers of the calcium carbonates, resulting in formation of solid solutions.
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