MIL-DTL-12276E(MR)
4.3.6.2.2.1 Aromatic and oxygenated solvents procedure A. Install the 6-ft. column and
follow the operating conditions described above. Inject about 3 micro-liters of the isolated
distillate and scan the chromatogram. The aliphatic solvents shall emerge within 1 minute
and the complete chromatogram should develop in about 5 minutes. From the position of
the peaks observed on the chromatogram, select an internal standard that shall be free of
interference, such as cyclopentanol or cyclohexanol. Add 0.6 ml. of internal standard to 3
ml. of the distillate, analyze according to the above procedure. Peaks emerging after 1
minute may be present. Calculate the percent of aromatic and oxygenated solvents as
follows:
═
Percent aromatic and oxygenated solvents, v/v
20 * x A
1.02 ** x B
where; A = area of aromatic and oxygenated solvents.
B = area of internal standard.
* = is percent of internal standard added.
** = is correction factor if cyclopentanol is used. If another internal
standard is used, calibrate to determine the correction factor.
NOTE: If the above determination exceeds 8 percent, continue with the following
procedure.
4.3.6.2.2.2 Total aromatic content procedure B. Proceed as in the qualitative test for
aromatic hydrocarbons (see 4.3.6.2.1). Remove as much of the top layer as possible and
wash it with distilled water. Carefully pipet 3 ml. of the washed solvent into a small flask
followed by 0.6 ml. of the internal standard. Mix and analyze according to procedure A.
Calculate the percent of aromatics after acid treatment in the same manner as in procedure A
and the percent of total aromatic solvents as follows:
═
Percent total aromatic solvents, v/v
B x (100 A)
100 - B
where; A = percent of aromatic and oxygenated solvents from procedure A.
B = percent of aromatic solvents after acid treatment.
NOTE: If the total aromatic content of the solvent is between 8 percent and 20 percent,
continue with the following procedure.
4.3.6.2.2.3 Toluene and ethyl benzene procedure C. Install the 18-ft. column and follow
the operating conditions described for that column. Add 0.3 ml. of high purity benzene to
the 3 ml. sample used in procedure A. If the results of procedures A and B indicated the
presence of oxygenated solvents, treat this sample with 85 percent sulfuric acid (use 3 ml.
acid) as described in procedure B. Inject about 3 micro-liters of sample and allow the
chromatograph to develop until all xylene isomers appear. Purge the column by raising the
column temperature to 120o C. After the high boiling materials emerge, reset the column
temperature to 70o C. Calculate the percent of toluene and ethylbenzene as follows:
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