L. Lopez-martinez et al., Simultaneous determination of uranium(VI) and thorium(IV) ions with carminic acid by bivariate calibration, J RAD NUCL, 247(2), 2001, pp. 413-417
A bivariate calibration method. has been applied to the simultaneous determ
ination of U(VI) and Th(IV) ions as complexes with carminic acid by visible
absorption spectrophotometry.. The bivariate calibration method was applie
d satisfactorily to the determination of these ions in synthetic solutions
simulating sulfuric acid leach solution obtained from uranium-thorium ores
and the results were compared with those given by first derivative spectrop
hotometry. No significant advantages of any method were found.