V.I. Dobrovolsky

Al’manac of Modern Metrology № 2 (14) 2018, pages 14–19

The report presents the description, metrological characteristics and application areas of the state primary standards: the pH of the activity of hydrogen ions in aqueous solutions, the activity rate pX ions in aqueous solutions, units of disperse composition of aerosols, suspensions and powders, units of mass concentration of oxygen and hydrogen in liquid media.

Key words: state primary standards, water solution, activity rate pH ions.

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