10.5.2 Frequency. Each GC/MS system must be recalibrated following corrective action (e.g., ion source
cleaning or repair, column replacement, etc.) which may change or affect the initial calibration criteria or if the
daily calibration acceptance criteria have not been met.
If time remains in the 24-hour time period after meeting the acceptance criteria for the initial calibration, samples
may be analyzed.
If time does not remain in the 24-hour period after meeting the acceptance criteria for the initial calibration, a new
analytical sequence shall commence with the analysis of the instrument performance check standard followed by
analysis of a daily calibration standard.