CRM-DW Elements in Drinking Water

Information
Within materials in water, ISC-Science produces Certified Reference Materials (CRMs) designed for determination of elements in water intended for human consumption. These materials are produced and certified according to ISO 17034 and covered by ENAC accreditation no. 3/PMR004.

Material Description
These Certified Reference Materials (CRMs) correspond to solutions of elements in a drinking water matrix using an appropiate low density polyethylene (LDPE) bottle. Subboiling distilled high-purity acid has been used to place the materials in solution and to stabilize the materials.

Value Calculation
Certified concentration values are based on gravimetric preparation and verified according to ISO 17034 and ISO/IEC 17025 by Inductively Coupled Plasma Mass Spectrometry (ICP-MS) using two methods of demonstrable accuracy in one laboratory. The expanded uncertainty stated for each certified value was calculated as U = 2 · u, where k = 2 is the coverage factor for a 95% confidence interval and u is the combined standard uncertainty calculated according to ISO Guide 35. The value of u is intended to represent the combined effect of uncertainty components associated with weighting of methods data and homogeneity and stability data.
Stability of these materials are based upon rigorous long-term (storage conditions) and short-term (transport conditions) testing of the solution for the certified values according to ISO 17034 and ISO Guide 35. These materials are monitored at ISC-Science.

CRM-DW
This material contains 29 elements with certified concentration, including elements stated on Directive (EU) 2020/2184 of the European Parliament and of the Council of 16 December 2020 on the quality of water intended for human consumption(1) at approximated concentration level equivalent to "parametric value" as Directive 2020/2184 defines(1).

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