title: Colorimetric determination of zirconium with 1-(2-pyridylazo)-2-naphthol.
abstract: A method is described for the determination of as little as 50 ppm of zirconium in uranium-fission element alloys and zinc magnesium-uranium-fission element alloys. Zirconium is extracted from a nitric acid-aluminium nitrate medium with dibutyl phosphate in toluene. The uranium co-extracted with the zirconium is removed by scrubbing with hydrochloric acid-ammonium thiocyanate solution. A portion of the organic phase is mixed with pyridine-toluene solution of 1-(2-pyridylazo)-2-naphthol to develop the colour.
authors.affiliation: Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, U.S.A.
authors.forename: L E
authors.initials: LE
authors.lastname: Ross
authors.forename: V M
authors.initials: VM
authors.lastname: Drabek
authors.forename: R P
authors.initials: RP
authors.lastname: Larsen