Analysis of high-purity selenium with concentration of impurities by matrix distillation

Two methods to concentrate impurities in selenium by matrix distillation (distillation in a flow of purified air and in a vacuum at 0.05-0.08 mm Hg) are proposed and compared to each other. The advantages of vacuum 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 determination 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%.