FED-STD-228A
where:
A=the number of ml. ceric sulfate required to titrate iron.
C=the grams of iron per ml. of ceric sulfate solution.
G=the weight of the lead sheath specimen.
5.1.4.2 Iron by the colorimetric method in 4.4.3:
Iron, percent = B x D x 100
G
where:
B=the number of ml. of iron standard required to match the specimen.
D=the grams of iron per ml. of iron standard.
G=the weight of the lead sheath specimen.
5.1.5 The zinc content of the lead sheath specimen determined as described in 4.5 shall be calculated as
follows:
Zinc, percent = A x B x 100
G
where:
A=the number of ml. of zinc standard required to match the specimen.
B=the grams of zinc per ml. of zinc standard solution.
G=the weight of the lead sheath specimen.
5.1.6 The silver content of the lead sheath specimen determined as described in 4.6 and 4.7 shall be
calculated as follows:
5.1.6.1 Silver by the iodide method in 4.6:
Silver, percent = A x 0.40 x 100
G
where:
A=the weight of the silver iodide precipitate.
G=the weight of the lead sheath specimen.
5.1.6.2 Silver by electrolysis in 4.7:
Silver, percent = A x 100
G
where:
A=the weight of the silver depot on electrode.
G=the weight of the lead sheath specimen.
5.1.7 The lead content of the specimen shall be calculated as follows:
Lead, percent=100 (percent copper, bismuth, arsenic, antimony, tin, iron, zinc, and silver)
5.2 Unless otherwise specified in the detail specification, two specimens from each inspection unit shall
be tested.
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