Purity Level of Chromium, Molybdenum, and Tungsten (according to Materials in the Exhibition–Collection of Extrapure Substances)

In this paper, we examine the purity level and impurity composition of the vanadium, niobium, and tantalum samples in the Exhibition–Collection of Extrapure Substances and present estimates of the average and total concentrations of elemental impurities in the purest samples. We examine the impurity composition of the array of the group 6 elements and contributions of particular groups of impurities and discuss the purity level of the group 6 elements and their compounds manufactured in Russia and abroad.