MIL-DTL-450D
g. Reserve the collected distillate for the aromatic solvent determination and qualitative test
for olefinic compounds.
4.4.19.2 Determination of aromatic hydrocarbons.
4.4.19.2.1 Equipment.
a. Gas chromatograph equipped with a thermal conductivity detector
b. The chromatographic column used shall be 18 feet of ½-inch copper tubing with
35 percent by weight of N, N-bis (2-cyanoethyl) formamide on 60- to 80-mesh Chromosorb P.
The column may be prepared in two 9-foot sections and joined together, if preferred. The
packings should be re-sieved before preparing the column. The gas chromatograph shall operate
under the following conditions:
Detector cell temperature, ºC
300
Detector cell current, ma
150
Injection port temperature, ºC
300
Helium flow at exit, cc/minute
110
Column temperature, ºC
100
4.4.19.2.2 Reagents.
a. Benzene or internal standard
4.4.19.2.3 Method.
a. Add 0.5 mL of internal standard (benzene) to 5 mL of the distillate from 4.4.19.1. Mix
thoroughly.
b. Inject about 3 microliters into the gas chromatograph. If aliphatic naphtha solvent is
used, toluene, ethylbenzene, and the xylene will be the only aromatic solvents present.
Extraneous peaks emerging after benzene, which do not coincide with the above-mentioned
aromatics, are to be grouped together and calculated as C8 and higher aromatic solvents. This
would include any oxygenated solvents that may be present.
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