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In the routine fluorimetrie procedure of the U, S* Geological Survey for the determination of uranium in the ash of plants, over 99 percent of the determinations during the past %year fall in the range Q.^ to 50 ppm* The method uses a simple nitric acid leach for solution of the ashed sample, Elements that wuld interfere are eliminated by extracting uranium present with ethyl acetate after addition of aluminum nitrate as a salting agent. The extracted uranium is fused with a fluoride-carbonatedoi:10.3133/tei654 fatcat:qky3hzsprreezfhgkdwrtg2rdq