Last Updated: 17-10-2019 11:23
Within the framework of the HBM4EU project, an Inter-Laboratory Comparison Investigation (ICI) was organized and conducted for the analysis of chromium in urine.
The study was performed from May 2019 to July 2019.
In total, 46 laboratories were invited for this third round, of which 26 laboratories from 17 countries registered.
The participation in this ICI was satisfactory; 25 out of 26 laboratories (96%) submitted their results.
In June 2019, two different test samples consisting of 5 mL urine spiked with chromium at two different concentrations (Crlow, Crhigh), one of each concentration, were prepared, and one sample of each concentration was sent to the participating laboratories for analysis.
Homogeneity and stability assessment of the control materials confirmed that the materials were adequately homogeneous and stable.
Laboratory results were rated using Z-scores in accordance with ISO 13528 and ISO 17043. The standard deviation for proficiency assessment (also called target standard deviation) was set to FFP = 25%, as described in 5.3.
The evaluation of Crlow showed that 92% of the results were satisfactory. In Crhigh, all results were satisfactory.