Manual of Blowpipe Analysis; Qualitative and Quantitative, with a Complete System of Determinative Mineralogy (Paperback)

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 tin, &#16...