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In the paper is discribed the preparation method of buffer solution for interlaboratory and international comparisons. This technique was developed by scientists of All-Russian Scientific Research Institute of Physicotechnical and Radio Engineering Measurements during the preparation of samples for international comparisons in the field of measuring the hydrogen index of borate buffer solution. According to the measurement results, the offered method allows to prepare the homogeneous and stable buffer solutions.

The metrological characteristics of buffer solutions prepared from high-purity substances were investigated. The possibility of using them in metrological studies conducted on the State Primary Standard of the рН activity of hydrogen ions in aqueous solutions GET 54–2011 was appraised.

The technique of manufacturing silver–silver chloride electrodes and the method of their subsequent selection for the State Primary Standard of pH activity of hydrogen ions in aqueous solutions are described.

The effect of the isotopic composition of water on the pH of buffer solutions is investigated. The relation between the difference in the values of the pH in natural water and water with a changed isotopic composition is established.

Detritiation of light water wastes down to a level permissible to discharge into the environment while simultaneously concentrating tritium to decrease amount of waste being buried is a constant problem. The laboratory setup for the light water detritiation process is presented. The separation column consists of 10 horizontally arranged perfluorosulphonic acid Nafion-type membrane contact devises and platinum catalyst (RCTU-3SM). Each contact device has 42.3 cm{sup 2} of the membrane and 10 cm{sup 3} of the catalyst. The column is washed by tritium free light water (L{sub H2O}) and the tritium-containing flow (F{sub HTO}) feeds the electrolyser at {lambda} = G{sub H2}/L{sub H2O} = 2. A separation factor of 66 is noted with the device at 336 K and 0.145 MPa. (authors)

The water permeability of the MF-4SK membrane (analogue of the Nafion membrane) modified with singly, doubly, and triply charged metal ions and then regenerated is examined. It is shown that the modification of the membrane with metal ions followed by regeneration substantially increases its water permeability because of a decrease in its thickness. It is found that the introduction of multiply charged ions more significantly affects the characteristics of the membrane.