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Division 3.1.1.2 Trueness

United Kingdom

Original text. Later amendments are not shown.

In this paragraph, the determination of trueness (one component of accuracy) is described. Trueness can only be established by means of certified reference material (CRM). A CRM be used whenever available. The procedure is described in detail in ISO 5725-4 (5). An example is given below:

  • analyse six replicates of the CRM in accordance with the test instructions for the method,

  • determine the concentration of the analyte present in each sample of the replicates,

  • calculate the mean, the standard deviation and the coefficient of variation (%) for these concentrations,

  • calculate the trueness by dividing the detected mean concentration by the certified value (measured as concentration) and multiply by 100, to express the result as a percentage.

Trueness ( %) = mean recovery-corrected concentration detected × 100/certified value.

If no CRM is available, instead of trueness, the recovery can be determined as described under 4.1.2.1 below.

Notes on Annex I

Textual amendments

F1

Replaced by virtue of 2003/181/EC: Commission Decision of 13 March 2003 amending Decision 2002/657/EC as regards the setting of minimum required performance limits (MRPLs) for certain residues in food of animal origin (Text with EEA relevance) (notified under document number C(2003) 764)