A flow injection spectrophotometric procedure for the simultaneous determination of rare earths with Arsenazo III is reported. The spectrum of the sample is recorded by using a diode array detector and the mixed spectra are resolved with the aid of a multicomponent analysis program based on a least-squares fitting algorithm. Binary mixtures of tervalent cations at concentrations between 0.5 and 2.5 μg/g and uranyl in the range 1.4-4.3 μg/g were accurately resolved by univariate calibration. The presence of thorium (2.8-7.0 μ/g) required the use of multivariate calibration in order to obtain accurate results. Tervalent cations were globally determined as lanthanum. The sampling rate was about 60 samples/h. The results obtained in the analysis of U and Th in a pitchblende agree well with the certified values. © 1990 Springer-Verlag.
|Journal||Fresenius' Journal of Analytical Chemistry|
|Publication status||Published - 1 Jan 1990|