Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10559568 | Talanta | 2011 | 6 Pages |
Abstract
Capillary zone electrophoresis was used to study the uranyl and short chain carboxylic acid sorption on silica and rutile. The separation and the simultaneous determination (in a single run) of a number of short chain carboxylic acids (oxalic, formic, acetic and propionic) and U(VI) with direct UV detection is developed for the analysis of solutions after the sorption experiments. The reverse polarity mode is used (the injection is performed at the negative end). The matrix effect of Si(IV) (possible silica dissolution product) and perchlorate (added for constant ionic strength in sorption experiments) on the separation of U(VI) and organic acids is investigated. The influence of methanol addition in carrier electrolyte on the separation selectivity of given analytes is also studied. Under the chosen conditions (carbonate buffer (ionic strength of 0.1Â M), pH 9.8, 0.15Â mM of tetradecyltrimethylammonium bromide, 25% (v/v) of methanol) the calibration curves are plotted. They are linear in two ranges of concentration from â¼1Â ÃÂ 10â5 to â¼1Â ÃÂ 10â3Â M for oxalate, acetate, propionate, U(VI) and â¼1Â ÃÂ 10â4 to â¼1Â ÃÂ 10â3 for formate. The accuracy of the procedure is checked by the “added-found” method in simulation solutions. The relative standard deviations of the concentrations found are within the range of 1-10% and the recovery is in the range of 90-115%. This method is applied for the analysis of aqueous samples issued from sorption experiments on silica and rutile. The obtained results indicate that the given organic acids decrease uranium sorption both on silica and rutile. These experiments demonstrate that short chain carboxylic acids can influence the mobility and the chemistry of U(VI) in the environment.
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Vladimir Sladkov, Yujia Zhao, Florence Mercier-Bion,