Division 5.3.1 F1

For GC-MS methods, the determination shall provide a valid estimate of the true concentration in a sample. High accuracy is required to avoid the rejection of a sample analysis result on the basis of poor reliability of the determined TEQ level. Accuracy is expressed as trueness (difference between the mean value measured for an analyte in a certified material and its certified value, expressed as a percentage of this value) and precision (RSD _R relative standard deviation calculated from results generated under reproducibility conditions).