MIL-DTL-14067C
D
=
Average acetylene peak areas, standard. (see 4.5.4.1.7, k.)
E
=
Weight, (grams). (see 4.5.4.1.8, e.)
F
=
Flask internal pressure, (bar). (see 4.5.4.1.8, j.)
G
=
Atmospheric pressure, (bar). (see 4.5.4.1.8, j.)
H
=
Average acetylene peak areas. (see 4.5.4.1.8, l.)
T
=
Average ambient temperature, (Kelvin).
y
=
Mole percentage of acetylene in the reference gas. (see 4.5.4.1.9)
Besides magnesium acetylide, the expression can be used to find the amount of carbides, in
terms of magnesium acetylide equivalent, that yield methane, ethene, ethane and other light
hydrocarbons; substitute the appropriate "y" for each type and multiply the end result by the ratio
{number of carbons in the hydrocarbon to that in MgC2 (two)}.
4.5.4.2 Carbides (alternate 1).
4.5.4.2.1 Apparatus. Apparatus similar to that shown in Figure 2 shall be used. There
must be a source of inert gas such as nitrogen, argon, or carbon dioxide.
4.5.4.2.2 Reagent. Hydroxylamine hydrochloride reagent. Dissolve 0.25 grams of
gelatin in hot distilled water. Dilute to 500 milliliters and add 500 milliliters of 95 % ethanol (or
isopropanol) and 1.25 grams of hydroxylamine hydrochloride.
4.5.4.2.3 Procedure.
a.
Add an accurately weighed portion of approximately 50 grams of magnesium powder to
the reaction flask (A).
b.
Transfer 50 milligrams of cuprous chloride to the test tube (B).
c.
Pass nitrogen (or other inert gas) through the apparatus to remove the air and continue the
passage of nitrogen throughout the determination.
d.
Disconnect the test tube and add into it 15 milliliters of concentrated NH4OH and 30
milliliters of the hydroxylamine hydrochloride reagent.
e.
Reconnect the test tube.
f.
Add 100 milliliters of distilled water from dropping funnel (C) and switch on the heater.
g.
Heat the mixture in the reaction flask just to boiling.
h.
A red or pink coloration of the cuprous ammonium chloride solution in the test tube
indicates that the magnesium sample contains more than 0.004 percent carbides. Should
the cuprous ammonium solution become blue due to the introduction of air, it must be
decolorized with successive 5 milliliter portions of hydroxylamine hydrochloride reagent
until the blue color disappears.
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