3.5.1.2 LOD based on the standard deviation of the blank
The detection limit may be determined by the analysis of a large number of blanks (n
≥
20 is recommended).
Where independent sample blanks are measured once each (n
≥
10 is recommended) and independent
sample blanks fortified at lowest acceptable concentration are measured once each (n
≥
10 is
recommended). The LOD is expressed as mean sample blank value plus three standard deviations (+ 3s).
Technical Note 17 - Guidelines for the validation and verification of quantitative and qualitative test methods
June 2012
Page 18 of 32
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