Extraction and Photometric Determination of Uranium(VI) by N-Phenyl-2-naphthohydroxamic Acid

Abstract

Abstract A new reagent, N-phenyl1–2-naphthohydroxamic acid (N-P-2-NHA), for the determination of microgram amounts of uranium(VI) is reported. Uranium is extracted from chloroform solution of N-P-2-NHA at pH 4.0 to 4.5. The orange-red, extract has maximum absorption at 515 nm. The extracted complex obeys Beer's law at 515 nm and the sensitivity is 0.01 μg U/cm2. The color is stable for 15 days. The effects of pH, reagent concentration, and diverse ions on extraction are discussed.