stdDev = sqrt ( sum( CONCsample - CONCavg)**2) / (N-1)
where N is the number of samples and CONC is the concentration
The result multiplier will depend on the number of samples
used for the calculation and the level of confidence required.
Instrument Detection Limit
Instrument Detection Limits is based on two
samples - a Blank and a Standard, and the concentration list
associated with the standard.
The IDL is calculated as follows:
IDL = (Multiplier * StdDev Blank) /
Background Equivalent Concentration