Abstract
The amount of sorbed metal ion released from CaC03 by 16 different extractants was found to vary with the chemical nature of the solution and the metal ion involved. In general, acid solutions dissolved a high proportion of both substrate and Cu, Ph, Cd coatings; complexing agents dissolved the same coatings but left most of the calcite; and competing cations (e.g. NH4 +, Ca2+) displaced primarily chemisorbed Cd and Cu. In Zn studies, little metal ion was retrieved by any extractant due to the limited solubility of the coatings formed at pH < 7.7.
The diverse behavior observed in the sorption studies has been interpreted in terms of solubility and absorption equilibria. The pH of the CaC03 suspensions was high enough to precipitate all added Pb as hydroxy species, and excess Cu tended to precipitate at pH > 6.4 if one increased the soluble carbonate level (e.g. by adding acid). Unlike Cd and Cu, Zn was not chemisorbed; it formed sparingly soluble compounds such as ZnC03.2Zn(OH)2, with excess coming out as Zn(OH)2 at pH > 7.7.
The significance of the results in respect to the mobility of metal ions in calcareous soils, and the evaluation of available levels, has been considered.
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Pickering, W.F. Extraction of copper, lead, zinc or cadmium ions sorbed on calcium carbonate. Water Air Soil Pollut 20, 299–309 (1983). https://doi.org/10.1007/BF00284635
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DOI: https://doi.org/10.1007/BF00284635