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Catalytic determination of traces of uranium in rocks by chronocoulometry
Author(s) -
Cantagallo Maria Inês C.,
Gutz Ivano G. R.
Publication year - 1994
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.1140061133
Subject(s) - uranium , chemistry , feldspar , dissolution , phosphorite , catalysis , quartz , mass spectrometry , aqueous solution , trace amounts , mineralogy , analytical chemistry (journal) , chromatography , inorganic chemistry , phosphate , geology , materials science , metallurgy , organic chemistry , medicine , paleontology , alternative medicine , pathology
The chronocoulometric method for the determination of trace levels of uranium based on the catalytic reduction of nitrate described in a preceding article, was applied and evaluated with real and synthetic samples Samples with complex matrixes like rocks were first solubilized in h9ot acid (HF+ HNO 3 ) by digestion under pressure in a PTFE bomb. When necessary, liquid‐liquid exraction with tri‐ n ‐ butyl phosphate (TBP) followed by reversion to aqueous phase was used for previous separation of interferents. Results for a feldspar, a phosphorite, and three granitic rock in the range of 2 to 100 ppm, are in good agreement with those obtained by other tedhniques such as X‐ray fluorescence, isotopic dilution‐mass spectrometry (ID‐MS), and instrumental activation analysis (differences of 4 to 16% in relation to the unweighted mear for different techniques).