Comparison of statistical validation parameters for three analytical methods for determination of total uranium fluorometric

Three analytical methods for determination of uranium in environmental samples by fluorescent technique have been compared. The first method depends on uranium purification from iron using the mercury anode technique, while, in the second method, uranium was purified from iron using the ion exchange technique (Dowex 1x4), employing a solution of hydrochloric acid (4.5 mol l-1), ascorbic acid (7%) and hydrazine hydrate (1.8%). The third method was performed using the ion exchange technique followed by uranium elution using a diluted sulfuric acid. The results have showed that the third method was the best among the studied methods. This is due to better values for detection limits, repeatability, replicability and recovery coefficient, in addition to low quantities of consumed chemical materials and less analytical time being required. (author)