MIL-DTL-38741A
a. Analyze the standard in triplicate using the chromatographic operating conditions of
4.4.1.3. Adjust the standard's recorded component and contaminant levels to account for any
significant impurities encountered in the starting materials using the method of standards addition
(see 6.3). A sample chromatogram of a calibration standard showing the order and positioning of
compound elution appears in figure 2.
b. Determine the weight percentage to the nearest 0.01 percent of each compound, including
the bromochlorodifluoromethane and each contaminant, in the calibration standard using the
formula:
100 × M N
WN =
MT
Where WN
= Weight percentage of compound being measured.
= Mass of compound in calibration standard.
MN
= Total mass in calibration standard.
MT
c. The new standard can be used for a period of approximately six months, provided that
sufficient material remains in the container. The gas chromatograph should be recalibrated using
the standard as often as necessary to maintain confidence in the analytical results.
4.4.1.6 Determination of contaminant response factors.
a. Determine and record each compound's absolute response factor as follows:
WN
ARFN =
AN
Where ARFN = Absolute response factor of compound N.
= Weight percentage of compound N.
WN
= Peak area of compound N (average of 3 runs).
AN
b. Using the bromochlorodifluoromethane as the reference peak, determine and record each
contaminant's relative response factor as follows:
ARFN
RRFN =
ARFBROMOCHLORODIFLUOROMETHANE
Where RRFN = Relative response factor of contaminant N (compute to four significant figures).
ARFN = Absolute response factor of contaminant N.
4.4.1.7 Specimen analysis. The specimen bromochlorodifluoromethane is analyzed using the
operating conditions listed in 4.4.1.3. The analysis shall be performed as follows:
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