OSHA Method ID-170SG: Soluble Uranium in Workplace Air
This method describes the collection and analysis of airborne particulates containing soluble uranium. The technique used for this analysis is Differential Pulse Cathodic Stripping Polarography (DPCSP). This technique involves the reduction of hexavalent uranium (U6+) on the surface of a static mercury electrode (SME) drop (7-1). The electrolyte solution used in the analysis contains 0.05 M tartaric acid and 0.05 M triethanolamine; it is weakly acidic, with a pH = 3.5. The electrolyte solution is used to extract soluble uranium from the sample filters, because it has been found experimentally to give better recoveries as compared to extraction using deionized water (DIW) (7.2). For this reason soluble uranium is defined in the context of this analytical procedure as that uranium which will dissolve in an aqueous solution containing 0.05 M tartaric acid and 0.05 M triethanolamine. Refer to BUD (7.2) for more details.