Abstract
Coprecipitation with hydrous manganese dioxide is used for the concentration of molybdenum from natural waters (including sea water) and from solutions prepared from silicate rocks and mineralized biological materials. Molybdenum is determined photometrically with dithiol after dissolving the manganese dioxide precipitate in sulphur dioxide solution. Since only a few elements are coprecipitated by manganese dioxide, separation before photometry is not normally necessary. However, if it is thought desirable, molybdenum can be separated from most other elements by adsorbing it on a cation exchanger and eluting it with hydrogen peroxide. The method was found to have a coefficient of variation of ca. 1% with sea water, argillaceous sediments and biological materials at concentration levels of 10.3 μg Mo/1, 7.2 μg Mo/g and 0.9 μg Mo/g respectively. The U.S. Geological Survey Standard granite (GI) and diabase (WI) were found to contain 6.3 and 0.48 μg Mo/g respectively.
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