Abstract
Colorimetric determination of UO22+ with β-diketone was examined. The β-diketones used were benzoylacetone (BA), dibenzoylmethane (DBM), isonicotinylbenzoylmathane (INBM), 2-furoylbenzoylmethane (FBM), and o-, m-, and p-methoxydibenzoylmethane (o-, m-, and p-MDBM). Absorption spectra and the effect of the amount of reagents, pH, and ethanol were examined and calibration curve under optimal conditions was prepared. In this analysis, 1cc. of 0.2% β-diketone solution was added to 5cc. of the sample solution of UO22+, 99% ethanol was added to make the whole volume 10.0cc., and optical density at each absorption maximum was determined. The curves became linear in the range of 0-120γ of FBM, 0-150γ of p-MDBM, 0-160γ of INBM, 0-160γ of DBM and m-MDBM, 0-180γ of o-MDBM, and 0-400γ of BA. indicating that colorimetric determination is possible. Of these β-diketones, the most sensitive was FBM, followed by.p-MDBM and INBM, both being better in sensitivity than DBM. o-MDBM and BA showed lower sensitivity than DBM.
