CFC-113 Scale

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.