Acid Digestion of Chromium Ores for Analysis with ICP
Acid digestion of chromium ores for determination of the metal content with ICP-OES or -MS is demanding due to the stability of the generic chromitite. Multiwave 5000 with Rotor 20SVT enables this difficult task with the convenience and safety of the SmartVent technology.
In the mining industry there is a large demand for fast routine analysis: In prospecting for new mining projects or in developing and maintaining existing mines, large numbers of mineral samples have to be analyzed quickly. These samples consist of ore and dead rock of varying ratio and are analyzed for geochemical lead elements to find or follow the geological formations that allow the most profitable mining operation.
While classical techniques for analysis involve fusion, for example with sodium peroxide (Na2O2) as a flux, acid digestion is rather difficult, due to the stability of the generic chromite mineral. Weathering processes, which may have been different for chromium ores from different mines strongly influence the stability of the chromite.
The method described in the following suits for the samples studied. However, depending on the source of the samples their composition may vary and require some modifications e.g. to the acid mixture. In any case, it may be used as a starting point.
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