Simultaneous determination of praseodymium, neodymium, holmium and erbium in rare earth mixtures with ofloxacin

摘要

A new reagent system has been developed for the simultaneous determination of praseodymium. neodymium, holmium and erbium in mixed rare earths. The method is based on the absorption spectra of 4f-electron transitions of Pr, Nd, Ho and Er complexes with ofloxacin. The second derivative spectrum has been used to eliminate the interference and to improve the sensitivity by a further factor of 2 similar to7. Beer's law is obeyed for 7 similar to 50 mug ml(-1) of Pr, Nd, Ho and Er. Their relative standard deviation of the al,sorption signals are found to he 3.8, 2.2, 2.6 and 3.2%, respectively. [References: 6]