ANALYSIS OF HIGH-PURITY SELENIUM WITH CONCENTRATION OF IMPURITIES BY MATRIX DISTILLATION

Two methods to concentrate impurities in selenium by matrix distillati on (distillation in a flow of purified air and in a vacuum at 0.05-0.0 8 mm Hg) are proposed and compared to each other. The advantages of va cuum distillation are demonstrated. An atomic-absorption procedure has been developed to analyze high-purity selenium with concentration of impurities by vacuum matrix distillation. The procedure provides the d etermination of Ag, Al, Au, Ba, Be, Bi, Ca, Cd, Co, Cr, Cu, Fe, Ga, Hf , In, Ir, La, Mg, Mn, Mo, Nh, Ni, Pb, Pd, Pt, Sc, Si, Sn, Ta, Ti, V, W , and Zn in selenium with detection limits of 2 x 10(-8)-2 x 10(-5) %. The repeatability of the results of analysis is characterized by RSD< 25%.