MIL-DTL-450D
e. If the presence of manganese is indicated, filter using acid-washed CAFA and glass
microfiber filter. Titrate the clean filtrate with N/10 oxalic acid until the red coloration
disappears.
4.4.5.4 Calculation of test results. Calculate the percentage of manganese in the sample as
.
follows:
Where:
V = volume of N/10 oxalic acid used (mL)
N = normality of oxalic acid
W = weight of sample in 4.4.4 (g).
4.4.6 Lead.
4.4.6.1 Equipment.
a. Beaker
b. Hotplate
c. Gooch crucible or equivalent
d. Oven
e. Scale
4.4.6.2 Reagents.
a. Ammonium hydroxide
b. Acetic acid
c. Sodium or potassium dichromate
d. Water
e. Alcohol
4.4.6.3 Method.
a. Transfer the remaining 80-mL portion of the solution obtained as described in 4.4.5 to a
beaker and evaporate to 5 mL.
11
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