Colorimetric determination of zirconium with 1-(2-pyridylazo)-2-naphthol.
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.
Ross
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Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, U.S.A.
Drabek
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Larsen
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