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2 2019

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Możliwości oceny błędów powstających w trakcie oznaczeń zawartości metali w wodach przeznaczonych do spożycia

Postawa Adam, Wątor Katarzyna, Rusiniak Piotr

Technologia Wody

2019

Nr 5 (67)

38--43

W prezentowanej pracy określono wielkości błędów wyników uzyskanych w trakcie oznaczeń zawartości metali w wodach przeznaczonych do spożycia oraz podjęto próbę wyjaśnienia zaobserwowanych różnic. Stwierdzono, że aby uniknąć błędów w wynikach oznaczeń, duże znaczenie ma dokładne przepłukanie instalacji przed pobraniem próbki do badania.

The presented work determined the magnitude of errors of results obtained during the determination of metal content in water intended for consumption, and an attempt was made to explain the observed differences. It was found that to avoid errors in the results of determinations, it is important to thoroughly rinse the installation before taking the sample for examination.

A probabilistic approach to assessment of the quality of drinking water

Wątor Katarzyna, Kmiecik Ewa, Postawa Adam, Rusiniak Piotr

Geologos

2019

Vol. 25, No. 3

249--254

Knowledge of uncertainty in analytical results is of prime importance in assessments of compliance with requirements set out for the quality of water intended for human consumption. Assessments of drinking water quality can be per-formed using either a deterministic or a probabilistic method. In the former approach, every single result is referred directly to the parametric value, while in the probabilistic method uncertainty related to analytical results is taken into account during the decision-making process. In the present research, laboratory uncertainty and uncertainty deter-mined on the basis of results of analyses of duplicate samples collected in two Polish cities were compared and used in the probabilistic approach of water quality assessment. Using the probabilistic method, more results were considered to be “above the parametric value”. Most excesses were observed when the maximum allowable uncertainty as set out in the Regulation of the Minister of Health of 7 December 2017 was used, which is due to the highest values of these uncertainties. The lowest values above parametric values in the probabilistic approach were observed when measurement uncertainty was considered.