This historic book may have numerous typos and missing text.
Purchasers can download a free scanned copy of the original book
(without typos) from the publisher. Not indexed. Not illustrated.
1882 Excerpt: ...to the last few words of 78, c, 2. If Pb only was
present and a gold button was used, the Pb must also first be
removed with boric acid. If test-lead was used in place of a gold
button, or if no gold button was used, and the substance originally
contained lead, separate the lead with boric acid, 88, /, 2, and
test the residual button for Ni and Cu just as directed for the
nickel-bearing gold button, 78, a, bat of course without adding any
gold.f In all cases of doubt confirm Cu in the S. Ph. bead by 88,
d. '(Any Ag or Au in the substance will be found by cupelling the
residual button from the treatment of the lead with boric acid; if
a gold button was used to collect Ni and Cu it will contain the Ag,
but a special test must be made for the Au. See also C, 2, e.) C.
Special and Confirmatory Tests. 1. Tests to be applied to the
roasted substance, or to the raw substance if roasting has not been
found necessary. a. Zn and SnJ Expel volatile substances (Cd, Pb,
Sb, Bi) by gentle 0. F. on coal, then reduce strongly w ith soda
and borax (and a little charcoal dust when Sn is sought for) in a
moderately deep cavity on coal, shaved away somewhat on the further
side so as to allow the formation of a coat, 50; test any coat with
cobalt solution for Zn, 79, and for Sn, 94. Also wash the powdered
slag and test any metallic residue for Sn, 94, a, e. b. Mn. Test
with S. Ph. (or soda) and potassium nitrate, 72, b, c. c' Si. Test
with S. Ph., 112, a. 2. Tests to be applied to the raw substance.
a. As. Test with soda in R. F. on coal, to get the odor; or make
suitable special tests, 98. b. Sb. If the substance contains no Bi
dissolve a little of it in S. Ph. in 0. F. on wire and test with
|Country of origin:
Henry Bedinger Cornwall
||246 x 189 x 6mm (L x W x T)
||Paperback - Trade
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