CCa and CCb allow estimation of the critical concentrations above
which the method can distinguish and quantify a substance, taking
into account the variability of the method and the statistical risk of
making a wrong decision (Lopes et al., 2012).
The decision limit
(CCa) is the lowest concentration of an unapproved contaminant that can be detected in a sample, with a 1% chance of a false-positive
decision. The detection capability (CCb) is the smallest content of the
analyte that can be detected, identified and/or quantified in a sample,
with a 5% chance of a false-negative decision