Estimation of the Optimum Concentration Interval of the Contents of Praseodymium, Neodymium, Europium, Holmium, and Erbium in a Solution
文摘
Based on the electronic absorption spectra of Pr3+, Nd3+, Eu3+, Ho3+, and Er3+ ions in 1 M aqueous solutions of chloric acid, calibration graphs have been constructed in a concentration of metals–optical density of a solution format for different frequencies. The band for praseodymium was used at 22,520 cm–1, for neodymium at 17,380, 13,480, and 12,560 cm–1, for europium at 25,380 cm–1, for holmium at 18,580 and 15,580 cm–1, and for erbium at 39,160, 26,480, and 19,160 cm–1. The errors in determining the concentration of the indicated elements as a function of their content have been calculated. It is shown that for perchloric solutions of praseodymium it is possible to correctly determine its contents within the concentration range 0.1–1.5 % at a frequency of 22,520 cm–1; for neodymium the ranges are 0.4–1.0, 0.3–1.0, and 0.5–1.0 % at 17,380, 13,480, and 12,560 cm–1, respectively; for europium 0.4–1.5 % at 25,380 cm–1; for holmium — 0.2–1.5 and 0.4–1.5 % at 15,580 and 18,580 cm–1, and for erbium the range is 0.4–1.0 % at frequencies of 39,160, 26,480, and 19,160 cm–1.
