FED-STD-228A
5.1.3 The arsenic, antimony, and tin content of the lead sheath specimen, determined as described in
4.3, shall be calculated as follows:
5.1.3.1 Arsenic, antimony, and tin by methods in 4.3.2, 4.3.3, and 4.3.4:
Arsenic, percent = A B x C x 100
G
Antimony, percent = B x D x 100
G
Tin, percent = E x F x 100
G
where:
A=the number of ml. of potassium bromate to titrate arsenic and antimony.
B=the number of ml. of potassium bromate to titrate the antimony.
C=the grams of arsenic per ml. of potassium bromate.
G=the weight of the lead sheath specimen.
D=the grams of antimony per ml. of potassium bromate.
E=the number of ml. of iodine required to titrate the tin.
F=the grams of tin per ml. of iodine solution.
5.1.3.2 Arsenic, antimony, and tin by methods in 4.3.5, 4.3.6, and 4.3.7:
Arsenic, percent = A x C x 100
G
Antimony, percent = B x E x 100
G
Tin, percent = D x F x 100
G
where:
A=the number of ml. of potassium bromate required to titrate the arsenic.
C=the grams of arsenic per ml. of potassium bromate.
G=the weight of the lead sheath specimen.
B=the number of ml. of potassium bromate required to titrate the antimony.
E=the grams of antimony per ml. of potassium bromate.
D=the number of ml. of iodine to titrate the tin.
F=the grams of tin per ml. of iodine solution.
5.1.4 The iron content of the lead sheath specimen determined as described in 4.4 shall be calculated as
follows:
5.1.4.1 Iron by volumetric method in 4.4.2
Iron, percent = A x C x 100
G
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