Butenko, V., Yakovleva, T., Troyeglazova, A., Zlobina, E., Korotkov, I. and Aubakirova, R. 2016. Effect of sample preparation methods on photometric determination of the tellurium and cobalt content in the samples of copper concentrates. Chemical Bulletin of Kazakh National University. 81, 1 (Mar. 2016), 26-31. DOI:https://doi.org/https://doi.org/10.15328/cb673.