An indirect voltammetric procedure for measuring free cyanide ions, using a chemically modified carbon-paste mercury-sensitive electrode, is described. The method is based on competitive H$'-complex formation reactions between an or anic ligand at the electrode surface and cyanide concentration was increased from 8.0 to 49.0 mp/L (0.3-1.9 x M). The relative standard deviation for five independent measurements was 8%.
CNions in solution.A linear decrease of the peak current of mercury in a solution of a defined Hg k concentration was observed, when the
"Zeferino Vaz"-13083-970-Campinas-SP Recebido em 11/5/99; aceito em 13/8/99 OBTENTION OF HEAVY METAL IONS ADSORBENT MATERIAL BY 2-MERCAPTOBENZI-MIDAZOLE ELECTROPOLIMERIZATION AT RETICULATED VITREOUS CARBON SURFACE. Electrochemical methods applied to organic species transformation has been used as excellent synthesis tools. CC bonds can be established, making possible polymer synthesis by both anodic and cathodic reactions of suitable monomer species at the working electrode surface. In this study, anodic procedure was used to electropolymerization of 2-mercaptobenzimidazole at reticulated glassy carbon (RGC) surface. 2-mercaptobenzimidazole presents ligand sites towards Hg 2+ , Ag + and Cu 2+ ions. The obtained material has been able to adsorb the above mentioned ions in aqueous solution.
Homogeneous nucleation of calcium carbonate is a common phenomenon in nature, which has attracted attention from researchers due to its importance in biomineralization processes, climatic changes and incrustations in pipelines. In this work, by using a numerical scheme based on SIMPLE algorithm, 3D numerical simulations are performed for the homogeneous nucleation of calcium carbonate in highly concentrated electrolyte solutions. For this purpose, one couples the Eulerian equations for multiphase flows to the discretized population balance equations, so that the resulting system of non-linear partial differential equations accounts for the mass transfer and changes in the particles size during the precipitation reaction. In order to validate the proposed model, experimental measurements of pH versus time and particles size distribution are compared with theoretical data. The remarkable agreement observed between the theoretical and experimental results indicates that the employed approach can be successfully used in studies of homogeneous nucleation of other sparingly soluble mineral salts.
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