Symbols Used in Discussion of Calibration Methods

Nonprimed symbols refer to the anal54ical sample prior to extraction, clean-up, etc. Symbols marked with a single prime ( ) refer to the sample extract solution (possibly spiked with internal standard). Symbols marked with a double prime ( ) refer to a solution of pure analytical standard used for calibration, possibly spiked with an internal standard. Symbols marked with three primes ( ) denote a calibrator prepared by spiking a matrix blank with a known amount of calibration standard, possibly spiked with an internal standard, and taken through the entire analytical procedure. 

B = slope of calibration line, related to the sensitivity (S. ff) of the chromatograph-detector combination  

Cj = concentration of the target analyte in the analytical sample (the desired end result = Q /Wj)  

C s = concentration of the stock solution of internal standard used to spike the sample, sample extract, external standard solution etc.  

C3 = concentration of analyte in a calibration solution of pure standard in clean solvent  

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