Determination of praseodymium oxide in air by inductively coupled plasma mass spectrometry
ZHANG Li-feng1, 2, YIN Hai-jing3, ZHOU Kai-hong1, 2, JIN Wen-li1, 2, BAI Yu-zhen4
1.Baotou Research Institute of Rare Earths, Baotou 014030, China; 2.National Engineering Research Centre of Rare Earth Metallurgy and Functional Materials, Baotou 014030, China; 3.School of Public Health of Baotou Medical College, Baotou 014040, China; 4.Technology Center of Boutou Iron and Steel Company, Baotou 014000, China
Abstract：The sample was taken with microporous filtering membrane and dissolved with nitric acid and perchloric acid, and then a inductively coupled plasma mass spectrometry was established for the determination of praseodymium concentration in the air of the electrolysis workshops in rare earth enterprises. Experimental results showed that when nitric acid and perchloric acid were used to dissolve the sample and the solution was heated to perchloric acid fumes appear, the sample was completely dissolved and the fluorine absorbed on the microporous membrane in the sampling process could be eliminated by evaporation, thereby eliminating the interference of fluorine in the determination. The effect of instrument signal drift and matrix on the determination could be eliminated by the internal standard method with the addition of the element cesium. The calibration curve exhibited fine linearity in praseodymium oxide concentration range of 5-50 ng/mL, with correlation coefficient of 0.999 9. The detection limit was 0.012 ng / mL, the lower determination limit was 0.40 ng/mL and the addition standard recovery of sanrple was in the range of 97%-102%. The method was applied to the determination of praseodymium oxide in the air of the electrolysis workshops in the rare earth plants, the determination results were consistent with those obtained by inductively coupled plasma spectrometry and the relative standard deviation (RSD, n=6) was in the range of 0.8%-2.3%.
