MIL-PRF-16005F
A-
= Concentration of anion in the hydrogen peroxide sample (mg/kg)
= Result from ASTM procedure for anion concentration (µg/l)
R
= Concentration of hydrogen peroxide in decomposed solution (g/ml)
C H 2O2
4.4.5 Ammonium. Ammonium concentration is determined by analyzing the decomposed
solution, prepared in 4.4.3, in accordance with ISO 14911 with the exception that only the concentration
of the ammonium cation needs to be determined. Calculate the ammonium concentration in the
hydrogen peroxide sample using the following formula:
R
+
=
NH 4
C H 2O2
where
+
= Concentration of ammonium in the hydrogen peroxide sample (mg/kg)
NH 4
= Result from ISO procedure for ammonium concentration (mg/l)
R
= Concentration of hydrogen peroxide in decomposed solution (g/ml)
C H 2O2
4.4.6 Stability.
4.4.6.1 Procedure. Transfer 50 ml of the sample into each of three 50-ml Pyrex volumetric flasks
that have been specifically prepared according to 4.4.6.3. Cover the top of each flask immediately with a
5 to 10-ml Pyrex beaker across its mouth to prevent condensed droplets from escaping. Weigh the flask
accurately to 0.01 gram. Place the flasks in a boiling water or steam bath. The flask necks must be
sealed to prevent the steam from heating the upper section so that sufficient condensing surface is
available to the samples. After 24 hours at the specified temperature remove the flasks. Cool to ambient
temperature and reweigh to ± 0.01 gram.
4.4.6.2 Calculation. The percent loss of active oxygen is calculated by averaging the results of
the individual flasks using the following formula:
100(W1 - W2 )
Ć%O2 =
0.470CW1
where
Ć%O2
= percent active oxygen loss
W1
= initial net weight
W2
= final net weight
C
= weight fraction of sample (concentration/100)
4.4.6.3 Test flask preparation. Dry the test flask and cover it with a 5 to 10-ml pyrex beaker.
Place the covered flask on a balance and record the tare weight to the nearest 0.01 gram. Fill the flask
with concentrated nitric acid, cover the top of the flask with aluminum foil, and place an inverted small
beaker over the aluminum cover. Place the flask in a boiling water or steam bath. Pour off the nitric acid
and rinse the flask with distilled water immediately followed with a hydrogen peroxide rinse. Distilled
water shall not be allowed to dry in the flask. Screen the flask by performing the stability test using
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