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Determination of Traces of Uranium in Environmental Samples Using a Flow Injection System with Amperometric Catalytic Detection
Author(s) -
Aguiar Marco A. S.,
Marquez Karem S. G.,
Gutz Ivano G. R.
Publication year - 2000
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/1521-4109(200006)12:10<742::aid-elan742>3.0.co;2-z
Subject(s) - amperometry , flow injection analysis , electrolyte , detection limit , uranium , chemistry , chromatography , dissolution , catalysis , trace amounts , electrode , analytical chemistry (journal) , materials science , electrochemistry , medicine , biochemistry , alternative medicine , pathology , metallurgy
A new method for flow injection analysis (FIA) of traces of uranium by catalytic amperometric detection in nitrate medium is described. Interfering oxygen was removed by in‐line degassing. A simple adapter was designed to afford FIA with batch cells comprising a hanging mercury drop electrode. The carrier electrolyte consisted of 10 mM LiNO 3 and the electrolyte for the samples was 10 mM HNO 3 +10 mM LiNO 3 . The method is simple, rapid (up to 60 injections/h) and precise (RSD=1.0 % for n =10 and C U =80 nM), presenting a LD of 13 pg of U or 3 nM (3 SD). Dissolution of solid samples (rock and soil) was abbreviated by employing a mixture of nitric and hydrofluoric acids in microwave heated closed vessels, followed by liquid‐liquid extraction with TBP. Analysis of reference materials and intercomparison with other techniques gave very favorable results.