On elevating the reliability of the hygienic assessment of water quality of natural sources of drinking water supply

Introduction. As new toxic substances accumulate in water bodies, improving the reliability of the hygienic assessment of water quality is put forward in the first place. For the correct solution of this problem, it is relevant to use the direct comparison of deterministic quantities such as the maximum permissible concentration (MPC) of toxic pollutants with the result of its measurements (C) and methods of approach for evaluating the results of research.

Material and methods. To improve the reliability of hygienic assessment of water quality in the proposed method tolerance control, envisaging the elucidation of the implementation type inequality and estimation of the probability of this event: where is the risk of false imprisonment. The number of concurrent measurements of water quality parameters guaranteeing an acceptable level of risk of error of research results is established by the authority of sanitary-epidemiological supervision, receiving a limited level of tolerable error taking into account the possibilities of metrological assurance of conformity assessment/quality of water and its normative level.

Results. It is shown that in cases when the compliance of controlled safety indicators is evaluated, the values of which are limited on both sides, as is the case when studying the physiological usefulness of water, it is necessary to establish a two-way range of values of the permissible probability of violation of the specified requirements. 

Conclusion. First installed: the rule “if it is impossible to argue that controlled water quality indicators do not meet hygienic requirements. Thus requirements are met” is not equivalent to the law “if the indicators meet the requirements, then they can’t be inappropriate”, which more reliably indicates compliance with these requirements.

Contribution:
Rakhmanin Yu.А. — concept and design of the research, editing, approval of the article’s final version, responsibility for the integrity of all parts of the article;
Rosenthal O.M. — concept and design of the research, collection and processing of material statistical processing, writing the text.
All authors are responsible for the integrity of all parts of the manuscript and approval of the manuscript final version.

Conflict of interest. The authors declare no conflict of interest.

Acknowledgement. The work was carried out in the framework of the scientific program of the Russian Academy of Sciences, a topic no. 0147-2019-0004 (governmental registration no. АААА-А19-119040990079-3)

Received: February 26, 2021 / Accepted: September 28, 2021 / Published: November 30, 2021