pH

The purpose of the study was to assess the state of ecological development of rural rural areas of the amalgamated territorial communities of Zhytomyr district based on drinking water quality indicators of non-centralised water supply sources to ensure their sustainable development. It was found that the average pH value was within the current standard, which indicates an excellent environmental condition for this indicator. The average content of nitrates in drinking water, which in all the studied communities exceeded the standard by 1.4 to 3.5 times, was assessed at only one point.

The activity of the photoinitiator system, based on triethanolamine (TEOA) and methylene blue (MB), on the photopolymerization of hydroxyethyl acrylate (HEA) monomer under very soft irradiation conditions, was evaluated. A remarkable difference in the polymerization kinetics of a set of PHEA experiments was underlined according to TEOA/MB concentrations, as well as the solutions pH.

A secondary pH of phthalate buffer was prepared by differential potentiometry method using a Baucke cell which is separated by sintered glass disk in the middle of cell – so called two-half cells. The method has been validated at 298 K with the purpose to evaluate its suitability for meeting the application requirement. The method validation parameters include accuracy (bias), precision (repeatability), and estimation of measurement uncertainty. It was found that both accuracy and precision of the method were good, which is indicated by their very low standard deviation (SD).

Hydrocarbon  resins (oligomers) are produced on the basis of fraction C9 of oil refining by-products. The low-temperature emulsion oligomerization can reduce the temperature and duration of the process compared to the existing technologies.