Division 2.3.2.1 Trueness of quantitative methods
United Kingdom
In the case of repeated analyses of a certified reference material, the guideline ranges for the deviation of the experimentally determined recovery corrected mean mass fraction from the certified value are as follows:
Table 2
Minimum trueness of quantitative methods
| Mass fraction | Range |
|---|---|
| ≤ 1 μg/kg | – 50 % to + 20 % |
| > 1 μg/kg to 10 μg/kg | – 30 % to + 10 % |
| ≥ 10 μg/kg | – 20 % to + 10 % |
When no such CRMs are available, it is acceptable that trueness of measurements is assessed through recovery of additions of known amounts of the analyte(s) to a blank matrix. Data corrected with the mean recovery are only acceptable when they fall within the ranges shown in Table 2.