The MPWN (Multifunctional Polish Natural Waters) project focuses on the preparation and certification of a matrix reference material (CRM) specifically designed for lake water analysis, incorporating certified concentrations of metals, inorganic ions, and microplastics. This initiative is conducted in collaboration with the Central Office of Measures (GUM) and various higher education institutions, addressing the increasing demand for standardized materials that enhance measurement traceability in environmental laboratories.

The candidate of chosen reference material originated from the water collected from Lake Roś, located in the Warmia-Masuria Province, which is exposed to elevated human activities. The range of analytes selected for certification ensures its applicability across a variety of analytical techniques.

A key feature of the MPWN CRM is its multifunctionality, allowing it to be utilized in a broader spectrum of analytical approaches, thus increasing accessibility for laboratories. The analytical methods employed in this project include, in between ICP-MS (Inductively Coupled Plasma Mass Spectrometry) for accurate trace element measurement, SP-ICP-MS (Single Particle Inductively Coupled Plasma Mass Spectrometry) for the detection and quantification of microplastics and nanoparticles, and XRF (X-ray Fluorescence) for elemental analysis of water samples.

The MPWN project underscores the importance of measurement traceability and provides essential reference materials necessary for laboratories to comply with regulatory requirements. The certification of the content of metals, anions, and microplastics ensures that these materials possess widespread applicability, significantly contributing to the enhancement of analytical standards in Poland.

Acknowledgement

The project titled "Development of a multifunctional matrix reference material: Multifunctional Polish Natural Waters (MPWN) with certified levels of metals, inorganic ions, and microplastic residues to ensure measurement traceability for Polish laboratories" is funded by the Ministry of Science and Higher Education under the Polish Metrology II Program, based on contract no. PM-II/SP/0061/2024/02 dated 15.02.2024.