F-2 Performance specifications and file types
•S/N ≥ 250:1, where noise is mean positive to mean negative going
noise about the mean (EPA 8290 definition, ≈ 2 standard deviations,
that is. ±σ about the mean).
These values are based on a GC peak width at half height of 2 seconds;
for other values, the signal-to-noise ratio can be calculated by assuming
a relationship inversely proportional to GC peak width. The cycle time
for selecting all six masses is about 0.5 seconds. At least 1 pg of
13
C
12
-2,3,7,8-TCDD is co-injected with the 100 fg standard.
On smoothed data, where the GC peak width is increased by no more
than 25%, the signal-to-noise ratios can be increased by a factor of 1.4,
that is, S/N ≥ 140:1 (4σ noise definition) or S/N ≥ 280:1 (2σ noise
definition).
• HR/SIR - GC/MS Sensitivity for 2,3,7,8 TCDD: S/N 125:1
File types
File type Details
*.exp Experimental file
*.ipr Instrument parameter file
*.prf Probe ramp method file
*.ref Calibration reference file
*.scl Scanning calibration file
*.sircal SIR calibration file
*.ypr Y-Focus file
*.a7890 Inlet parameter file specifically for the Agilent GC oven
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