Speciation of Tc(IV) in chloride solutions by capillary electrophoresis

Abstract

Browse Search My Profile Activate Help Home > List of Issues > Table of Contents > Abstract Speciation of Tc(IV) in chloride solutions by capillary electrophoresis Author(s): Xiaolan Liu | Frédéric Poineau | Massoud Fattahi | Bernd Grambow | L. Vichot doi: 10.1524/ract.93.5.305.64276 View PDF article (245 K) View table of contents Email this link Add to my alerts What is RSS? Trouble viewing articles as PDF? Radiochimica Acta Print ISSN: 0033-8230 Volume: 93 | Issue: 5/2005 Cover date: 20050501 Page(s): 305-309 Abstract text A method for speciation of Tc(IV) species (TcCl62− and TcCl5(H2O)−) in chloride solutions, using capillary electrophoresis (CE) technique was developed. The proposed method has overcome the difficulties of unstable oxidation states analysis by shortening their travel time in the capillary. TcCl62− and TcCl5(H2O)− were thus separated without being hydrolyzed and polymerized, and their UV/Vis spectra were recorded. With a 1 M HCl/NaCl buffer solution (pH=1), the electrophoretic mobilities were determined as 5.47×10−4 cm2/Vs for TcCl62− and 2.13×10−4 cm2/Vs for TcCl5(H2O)− at 25 °C. The total analysis time for one run is 12 minutes

Element Speciation Analysis Using Capillary Electrophoresis: Twenty Years of Development and Applications

“…To obviate this negative effect, it almost always proves satisfactory to add the precapillary derivatization agent also to the capillary electrolyte. , Alternatively, (highly) acidic electrolytes can be used to overcome the difficulties of species hydrolysis and polymerization. Some examples are the noble metals, various oxidation states of plutonium and neptunium, uranium(VI), or technetium(IV) . In order to maintain accurate sample speciation of, for example, Cr(III) hydrolytic polymerization products, noncomplexing separation electrolytes, such as a LaCl 3 solution, have proven successful.…”

“…Some examples are the noble metals, 43 various oxidation states of plutonium and neptunium, 44 uranium(VI), 45 or technetium-(IV). 46 In order to maintain accurate sample speciation of, for example, Cr(III) hydrolytic polymerization products, noncomplexing separation electrolytes, such as a LaCl 3 solution, 47 have proven successful. Otherwise, in order to infer structural information about the hydrolyzed Cr(III) species, they first had to be isolated by an ion exchange step.…”