Abstract
A cation exchange separation of Si from Pu is niade prior to spectrographic determination to reduce the health hazard and spectral interference from Pu. Boiler cap electrodes in conjunction with a sodium carbonate buffer double the sensitivity normally obtained without caps in the same direct current arc methods. The lower limit of detection is 1 ppm Si. The over-all relative standard deviation of the method was within plus or minus 9%. (auth)
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