Interlaboratory comparative tests

We provide the following services:

• drinking-water sampling;
• surface-water sampling;
• wastewater sampling.

Water samples are taken at selected sampling points. We assess the proficiency of sampling teams in view of the nature of activities performed within the scope of interlaboratory comparative testing (ICT). In addition to the statistical evaluation of the results of analyses of selected water sample indicators, we emphasise water sampling, the sampling equipment applied, the sampling staff’s theoretical knowledge, and assessing the sampling documentation used during water sampling. This is performed in accordance with the requirements imposed by the applicable laws and technical standards concerning the abstraction of specific water matrices.

Currently available proficiency tests

Information on proficiency testing

Registration form for PT database

Archive of completed proficiency tests

In connection with the application of chemical and radiochemical methods, we carry out the following:

• radiochemical analysis;
• inorganic trace analysis;
• organic trace analysis;
• basic physico-chemical analysis.

Water samples taken are prepared and analysed in the NRL’s accredited testing laboratory. In connection with the application of chemical methods, we determine the parameters of water quality, depending on the type of water and the purpose for which the samples are analysed. We also analyse model samples, natural samples, and enriched natural samples. For the preparation of model samples, we use commercially available certified reference materials or other reference materials. Natural water samples are selected on the basis of long-term water source monitoring.

In connection with the application of biological methods, we perform the following:

• hydrobiological water analysis;
• microbiological water analysis.

The water samples taken are prepared and analysed in the NRL’s accredited testing laboratory. For hydrobiological and microbiological analyses, both natural and model samples can be used. Natural samples are taken in localities that are year-round monitored. Natural water samples taken for hydrobiological tests are enriched with algae and cyanobacteria cultures obtained from specialised collections (i.e. from the Botanical Institute of the Slovak Academy of Sciences, or from the Botanical Institute of the Czech Academy of Sciences). Natural water samples for microbiological tests are enriched with reference strains obtained from collections listed in the World Data Centre for Microorganisms (WDCM).