Collect. Czech. Chem. Commun. 1988, 53, 543-553

Multicomponent determination by flow injection analysis using PU 4021 diode array detector. A direct determination of lanthanoids

Vlastimil Kubáň and Petr Doležel

Department of Analytical Chemistry, J. E. Purkyně University, 611 37 Brno


Flow injection analysis (FIA) using a multichannel UV-VIS diode array detector enables several components with sufficiently separate absorption bands to be determined simultaneously. The effects of the basic parameters of the FIA apparatus (geometry, flow rates, etc.), error of measurement of the analytical signal, mutual interactions between the components to be determined, and the data handling procedure on the accuracy and precision of the calculated concentrations of the components are demonstrated on a model case of binary and ternary mixtures of Cu(II), Ni(II), Co(II), and U(VI). The majority and minority components can be determined with relative errors of 1-3% and 2-20%, respectively, over the concentration region of 2 to 200 mmol l-1 at concentration ratios from 1:1 to 50:1. The method has been applied to a simultaneous determination of Pr(III), Sm(III), and Nd(III) in oxidic concentrates of rare earths over the region of 1 – 20 mg ml-1 at concentration ratios down to 1:10 with relative errors not exceeding 5%.