Contamination in the rare-earth element orthophosphate reference samples.(lead contamination in Oak Ridge National Laboratory samples from the 1980s)
From: Journal of Research of the National Institute of Standards andTechnology
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Date: 11/1/2002
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Author: Boatner, Lynn A.; Donovan, John J.; Hanchar, John M.; Jarosewich, Eugene; Picolli, Phillip M.; Schrier, Marc D.
Several of the fourteen rare-earth element (plus Sc and Y) orthophosphate standards grown at Oak Ridge National Laboratory in the 1980s and widely distributed by the Smithsonian Institution's Department of Mineral Sciences, are significantly contaminated by Pb. The origin of this impurity is the [Pb.sub.2][P.sub.2][O.sub.7] flux that is derived from the thermal decomposition of Pb[HPO.sub.4] The lead pyrophosphate flux is used to dissolve the oxide starting materials at elevated ...
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