Cerium(IV)-iron(II) back-titrimetric determination of the composition of ternary uranium oxides

Magnetic studies on CoU2O6 and NiU2O6 by magnetic susceptibility, specific heat and neutron diffraction measurements

“…The oxygen non-stoichiometry in the specimen was checked by the back-titration method [4]. A weighed sample was dissolved in excess cerium (IV) sulfate solution.…”

Determination of the O/M ratios of polynary uranium oxides by Ce(IV)-Fe(II) back titration after dissolution in mixed sulphuric and phosphoric acids

“…Carboxylic, phenolic and alcoholic groups are most relevant, because they can interact with metal ions influencing their transport, deposition and bioavailibility in the environment [2]. Several efforts have been made to determine the content of the above mentioned functional groups contained in HS [3,4]. Mikita et al [5] reacted HS with 13 C-enriched methylating reagents such as 13 CH 2 N 2 and 13 CH 3 -I and determined the content of different methoxy groups by 13 C-NMR.…”

“…Therefore, all procedures can be carried out in air. By modifying this method, the determination was made at the same time for the x and y values of the ternary uranium oxides, M y U 1-y O 2+x , where M are alkaline-earth metals or rare-earth elements [4]. But there still is the problem that some polynary uranium oxides will not dissolve in hot Ce(IV) sulphuric acid.…”