FED-STD-228A
5. RESULTS
5.1 Calculations.
5.1.1 The copper and bismuth content of the lead sheath specimen determined as described in 4.1 shall
be calculated as follows:
Copper, percent = B x C x 100
D
Bismuth, percent = A-(BxC) x 100
D
where:
A=the weight of the copper bismuth deposit on the electrode.
B=the number of ml. of sodium thiosulfate required to titrate the copper.
C=the grams of copper per ml. of sodium thiosulfate
D=the weight of the lead sheath specimen.
5.1.2 The copper and bismuth content of the lead sheath specimen determined as described in 4.2 shall
be calculated as follows:
Copper, percent = B x C x 100
D
Bismuth, percent = 100E x 100
DF
where:
B=the number of ml. of sodium thiosulfate required to titrate the copper.
C=the grams of copper per ml. of sodium thiosulfate.
D=the weight of the lead specimen.
E=the grams of bismuth in the aliquot.
F=the number of ml. of aliquot for bismuth determination.
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