MIL-DTL-44048H
Oven temperature 230oC
a.
Injector temperature 275oC
b.
Detector temperature 275oC
c.
Injection volume - 1µl
d.
e.
Carrier gas flow rate 1ml/minute
f.
Column head pressure 4 p.s.i.
g.
Run time 15 minutes
h.
Split ratio 1:1
i.
Purge Off initially, On 0.5 min, flow rate 1.0 ml/minute
Repeat the standard injection three times and determine the average area for permethrin.
4.4.8.5 Test specimen. Three specimens (1 inch by 3 inches) shall be cut from the permethrin treated
material. The mass of the specimens shall be recorded to the nearest milligram.
4.4.8.6 Number of determinations. Unless otherwise specified in the procurement document, three
specimens for each sample shall be tested.
4.4.8.7 Test procedure. Place each specimen into cellulose Soxhlet extraction thimble. Add 160ml of
the acetonitrile/methanol mixture and several boiling chips into a 250 ml heat resistant glass flask.
Assemble the Soxhlet extraction apparatus and extract the permethrin impregnated specimens for 6
hours. after 6 hours of extraction, concentrate the extract by rotoevaporation at 35oC to a final volume
of less than 10 ml and pour the resulting solution into the 10 ml volumetric flask and fill to volume with
the acetonitrile/methanol solution. Inject 1µl of the extract into the gas chromatograph using the
conditions outlined in 4.4.8.4.3.
4.4.8.8 Calculations. The mg permethrin/cm2 shall be calculated from the peak area of the gas
chromatographic curve as follows:
mg Permethrin/cm2 = Ws x At x Ve
Vs x As x Am
Where
Ws = weight of injected standard in mg
At = peak area of test specimen
Ve = volume of specimen
As = peak area of standard
Am = test specimen area in cm2
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