Proconcentration of trace elements from high-purity thorium and uranium on Chelex-100 and determination by graphite furnace atomic absorption spectrometry with Zeeman-effect background correction |
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Authors: | Naina Raje Satish Kayasth T P S Asari S Gangadharan |
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Institution: | Analytical Chemistry Division, BARC, Trombay, Bombay 400 085, India |
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Abstract: | Preconcentration of trace impurities form large-sized samples of uranium metal and thorium oxide using a small column of Chelex-100 followed by their determination using graphite furnace atomic absorption spectrometry (GFAAS) is reported. A 0.5–10-g amount of the sample (uranium metal or thorium oxide) was dissolved, complexed with ammonium carbonate and subjected to the ion-exchange procedure. The retained analytes were eluted with 2–4 M nitric acid and brought to a small volume for a final dilution to 10-25 ml for their determination using GFAAS. The validity of the separation procedure and recoveries at μg kg?1 levels was checked by standard addition; the recoveries were> 95%. |
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Keywords: | Atomic absorption spectrometry Sample preparation Preconcentration Thorium Trace elements Uranium |
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