Abstract: The authors present experimental data on the development of a special sample in the form of a dispersed material that simulates the mineral macro-component composition of natural surface water. The results of the study obtained by a number of physico-chemical analysis methods were compared to determine the mass concentration of the micro-component - manganese (II) in the sample. Determination of the mass concentration of manganese (II) was carried out by the methods of spectrophotometry for PND F 14.1:2.61, x-ray fluorometry for PND F 14.1:2:4....
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