title: Simultaneous determination of uranium and thorium with Arsenazo III by second-derivative spectrophotometry.
abstract: A derivative spectrophotometric method has been developed for the simultaneous determination of microgram quantities of uranium and thorium with Arsenazo III in hydrochloric acid medium. The second-derivative absorbances of the uranium and thorium Arsenazo III complexes at 679.5 and 684.4 nm are used for their quantification. Uranium and thorium, both in the range 0.1-0.7 mug/ml have been determined simultaneously with good precision. The procedure does not require separation of uranium and thorium, and allows the determination of both metals in the presence of alkaline-earth metals and zirconium, but lanthanides interfere.
authors.affiliation: Laboratory for Analytical Chemistry, Faculty of Engineering, University of Chiba, Yayoi-cho, Chiba 260, Japan.
authors.forename: R
authors.initials: R
authors.lastname: Kuroda
authors.forename: M
authors.initials: M
authors.lastname: Kurosaki
authors.forename: Y
authors.initials: Y
authors.lastname: Hayashibe
authors.forename: S
authors.initials: S
authors.lastname: Ishimaru