The spectrophotometric determination of uranium(VI) with methylthymol blue

Abstract

Uranium(VI) and methylthymol blue form a red complex in aqueous solution with maximum development of color at pH values between 6.6 to 6.8 (λ max = 510 mμ). The net molar absorptivity is 10,625 at pH 6.7 and Beer's law is obeyed in the range of 0.4–3.76 ppm of uranium. A procedure is described for the accurate spectrophotometric determination of uranium. The ratio of metal:ligand in the complex is 1:1.