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1284504 
Journal Article 
SPECTROPHOTOMETRIC DETERMINATION OF URANIUM(VI) WITH CHROMAZUROL S AND CETYLPYRIDINIUM BROMIDE 
Leong, Cl 
1973 
SINCE THE URANYL ION HAS BEEN FOUND TO FORM A SOLUBLE BLUE COMPLEX WITH CHROMAZUROL S AND CETYLPYRIDINIUM BROMIDE (CPB), A STUDY HAS BEEN MADE OF THE COLOR REACTION WITH REFERENCE TO THE DEVELOPMENT OF A SUITABLE SPECTROPHOTOMETRIC METHOD FOR DETERMINING U(VI). A STUDY OF THE OPTIMUM CONDITIONS FOR COLOR DEVELOPMENT YIELDED THE FOLLOWING: (1) PH 4.8 WAS CHOSEN FOR ALL ABSORPTION MEASUREMENTS. (2) AT AN AVERAGE TEMPERATURE OF 20 C, MAXIMUM ABSORBANCE WAS OBTAINED IN 15 MINUTES AND ABSORBANCE REMAINED CONSTANT FOR AT LEAST 24 HOURS. (3) THE COMPLEX WAS NOT EXTRACTABLE BY CHLOROFORM, CARBON TETRACHLORIDE, ETHER, NITROBENZENE, NITROMETHANE, ISOBUTYL KETONE, ISOAMYL ALCOHOL, AND BENZYL ALCOHOL. (4) THE CALIBRATION GRAPH OBEYED BEER'S LAW FOR 0-100 MICROGRAMS OF U(VI)/50 ML OF SOLUTION. (5) THE COLOR REACTION HAS A MOLAR ABSORPTIVITY OF 99,000 AT 625 NM AND A RELATIVE STANDARD DEVIATION OF 3 PERCENT. (6) A 100-FOLD WEIGHT EXCESS OF A1(III), CR(VI), BE(II), FE(III), BI(III), MO(VI), YB(III), DY(III), AND CE(III) GAVE SERIOUS INTERFERENCES, WHILE A 2-FOLD WEIGHT EXCESS OF TH(IV) GAVE INTERFERENCE. PRELIMINARY SEPARATION OF U(VI) BY SUCH METHODS AS ION EXCHANGE WILL BE NECESSARY BEFORE DETERMINATION. (HOLOMAN-BATTELLE) 
DYSPROSIUM; *COLOR REACTIONS; *HEAVY METALS; ISOBUTYL KETONE; IONIC INTERFERENCE; REPRODUCIBILITY; SENSITIVITY; HYDROGEN ION CONCENTRATION; TITANIUM; *CHROMAZUROL; GADOLINIUM; ZINC; CHROMIUM; ETHER; NEODYMIUM; SEPARATION TECHNIQUES; LEAD; NITROBENZENE; SAMARIUM; METHODOLOGY; ISOAMYL ALCOHOL; AQUEOUS SOLUTIONS; NITROMETHANE; CATIONS; CARBON TETRACHLORIDE; CERIUM; BERYLLIUM; MAGNESIUM; *SPECTROPHOTOMETRY; NICKEL; ORGANIC SOLVENTS; *URANIUM; CHLOROFORM; THORIUM; *POLLUTANT IDENTIFICATION; RARE EARTH ELEMENTS; ABSORBANCE; EUROPIUM; COBALT; BENZYL ALCOHOL; ALKALINE EARTH METALS; CHEMICAL INTERFERENCE; CHEMICAL REACTIONS; BISMUTH; YTTERBIUM; MOLYBDENUM; ALUMINUM; CHROMOGENIC REAGENTS; LANTHANUM; MANGANESE; CALCIUM; S; SOLVENT EXTRACTIONS; IRON; TUNGSTEN; MOLAR ABSORPTIVITY; *CETYLPYRIDINIUM BROMIDE