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In this paper, we examine the purity level and impurity composition of rare-earth metals represented at the Exhibition–Collection of Extrapure Substances and present estimates of the average and total concentrations of elemental impurities in the purest samples. We analyze the impurity composition of the entire array of rare-earth metals and contributions of particular groups of impurities. [ABSTRACT FROM AUTHOR]

In this paper, we discuss the purity level of the alkaline-earth metals (AEMs) and their compounds manufactured in Russia and abroad. We consider the impurity composition of the array of AEM samples in the Exhibition–Collection of Extrapure Substances and contributions of particular groups of impurities. [ABSTRACT FROM AUTHOR]