Conference paper

The Role of Surface Coordination in Precipitation and Dissolution of Mineral Phases

Werner Stumm ; Federal Institute for Water Resources and Water Pollution Control (EAWAG) Swiss Federal Institute of Technology, Zurich, Switzerland
Gerhard Furrer ; Federal Institute for Water Resources and Water Pollution Control (EAWAG) Swiss Federal Institute of Technology, Zurich, Switzerland
Bruno Kunz ; Federal Institute for Water Resources and Water Pollution Control (EAWAG) Swiss Federal Institute of Technology, Zurich, Switzerland

Abstract

In precipitation and dissolution of minerals, the coordinative
partners of the crystal-forming ions are changed. In heterogeneous
nucleation, these ions interact coordinatively (surface complex
formation and ligand exchange) with the surface sites of the heteronuclei
or template. The dissolution of oxides too depends on the
influence of surface complex-forming ligands and on the degree
of surface protonation. A specific rate law for the dissolution of
1>-Ah03 as influenced by [H+] and [oxalate] is given. Generalized
ideas on the effect of surface coordination in accelerating or inhibiting
the dissolution of hydrous oxides and its relevance in the
chemistry of rock weathering and metal corrosion are discussed.

Keywords

Hrčak ID:

194184

URI

https://hrcak.srce.hr/194184

Publication date:

9.11.1983.

Visits: 916 *