TRANSFORMATION BEHAVIOR OF DIFFERENT PLATINUM COMPOUNDS IN A CLAY-LIKE HUMIC SOIL - SPECIATION INVESTIGATIONS

Synthetic platinum compounds with different oxidation stages and a pla tinum containing tunnel dust, used as a natural sample, were added to a clay-like humic soil. Possible chemical and physical interactions wi th the soil were investigated. Oxidation of finely dispersed metallic platinum in the soil was studied by eluting platinum species with diff erent polar solvents and complexing agents. Due to its ultrafine dispe rsion and nanocrystalline particle size, the platinum present in the t unnel dust was oxidised in the soil to a higher degree than the model compound platinum black. K2PtCl4 and Na2PtCl6 6H(2)O showed strong a dsorption in the soil by recomplexation into almost insoluble species. Differences in the transformation reactions between native and artifi cial platinum compounds are described.