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CFC-113 calibration standards   2002 Scale
updated: April, 2002
  year prepared assigned residual
(ppt) (ppt)
ALM-26735 1993 48.0 48.0 0.0
ALM-26743 1993 82.8 83.6 0.8
ALM-26737 1993 90.0 88.3 -1.7
CLM-2434 1991 50.1 51.4 1.3
CLM-11528 2001 45.8 45.8 0.0
CLM-9024A 2001 27.9 29.2 1.2
ALM-33800A 2002 95.0 95.5 0.5
ALM-65990A 2002 113.9 113.9 0.0
ALM-64981A 2002 46.3 45.6 -0.6
ALM-64608B 2002 93.1 93.8 0.7
std dev 0.91

Note: New primary standards prepared in 2003 are not shown here. We are having trouble comparing humidified standards in Essex cylinders to dry standards in Aculife-treated alumimum cylinders. The drying agent Mg(ClO4)2 appears to affect the response of CFC-113 on ECD, but not on GC-MSD. Even with the uncertainties caused by thedrying agent, the 2002 and 1992 scales are equivalent at ambient CFC-113 mixing ratios.