MIL-DTL-38741A
b. Small quantities of the substances listed in table II are used to prepare the calibration
standard. Calibration standards may be purchased commercially or prepared in accordance
with 4.4.1.4. The purity of each compound listed in table II must be predetermined using the
chromatographic operating conditions in 4.4.1.3.
Table II. Calibration substances.
Common Name
IUPAC Convention Name
CAS Number
CFC-12
dichlorodifluoromethane
75-71-8
CFC-13
chlorotrifluoromethane
75-72-9
Halon 1201
bromodifluoromethane
1511-62-2
Halon 1202
dibromodifluoromethane
75-61-6
Halon 1211
bromochlorodifluoromethane
353-59-3
Halon 1301
bromotrifluoromethane
75-63-8
HCFC-22
chlorodifluoromethane
75-45-6
HFC-23
trifluoromethane
75-46-7
4.4.1.3 Operating conditions.
a. Detector
FID
Helium; 30 mL min.-1
b. Carrier Gas
c. Initial Column Temp.
40 °C
d. Initial Hold
12 min.
20 K min.-1
e. Program
f. Final Column Temp.
160 °C
g. Post Hold
15 min.
h. Sample Loop
1 mL
i. Detector Temp.
200 °C
j. Injection Port Temp.
150 °C
4.4.1.4 Calibration standard preparation.
a. Evacuate a clean; dry; 1,000 mL; aluminum, carbon steel, or stainless steel; sample cylinder
to an absolute pressure of not more than 25 Pa. Weigh the evacuated cylinder to the nearest
0.1 milligram. Using a vacuum manifold to avoid the introduction of air, add 11 grams of
bromochlorodifluoromethane vapor to the cylinder. Close the cylinder and reweigh, recording the
amount of bromochlorodifluoromethane added to the nearest 0.1 milligram.
CAUTION - Do not fill the sample cylinder to more than 12 grams per liter or conduct
any laboratory work in an ambient temperature below 15 °C. Failure to observe these
precautions will cause the calibration standard to condense and fractionate, resulting in
sporadic data.
4
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