Si-Traceable values for cadmium concentration in the water samples of the International Measurement Evaluation Programme Round 6 (IMEP-6)
The International Measurement Evaluation Program (IMEP) has been in existence since the end of the last decade (1988). The aim of the project is to picture objectively the performance of measurement laboratories in the field by offering them reference values traceable to the Système International (SI) system with the aim of providing an objective evaluation system of laboratory results in chemical measurement. Several round of the program were performed in the past, in order to evaluate measurement capability of various concentrations of various elements in various materials. The latest one (IMEP-6) focused on trace element determination in water samples (as in IMEP-3). This paper describes the certification measurement for the cadmium concentration in the samples as performed by Isotope Dilution (ID) using Inductively Coupled Plasma Mass Spectrometry (ICP-MS). By using a primary method of measurement (ID), making up a full uncertainly budget and using a sensitive technique (ICP-MS), reference values traceable to SI can be obtained for this material. The uncertainty budget is performed in accordance with the International Standards Organization (ISO) and EURACHEM guides on uncertainly. A comparison is made with certification results of other experienced laboratories, also using primary methods, where possible.
Bibliographic Reference: Article : Fresenius' Journal of Analytical Chemistry (1996)
Record Number: 199610915 / Last updated on: 1996-09-16
Original language: en
Available languages: en