STUDY ON COLOR REACTION OF POLYCOMPONENT COMPLEXSYSTEM OF U-5-Br-PADAP-RHODANIDE-DODECYL-DIMIZTHYL-AMINOACETIC ACID

A color reaction based on the polycomponent complex----UO_2~2-5-Br-PADAP-rhodanide-dodecyl-dimethyl-aminoacetic acid(DDMAA) is investigated. It is shownthat the complex ratio of UO_2~(2+): 5-Br-PADAP:CNS~-=1:1:2 in the presents ofDDMAA at pH 3.5--6.5, the molar absorptivity is ε=8.9×10~4l·mol~(-1)·cm~(-1) at595 nm. The complex is a polycomponent micelle one with positive electricity. Thecalibration curve is linear for uranium over concentration rang of 0--30 μg/25 ml.Interfering ions can be separated by TBP levextrel and masked with Al-CyDTA.The mothed is applied to the determination of uranium in complicate ores.