Element of Mineralogy, Crystallography and Blowpipe Analysis from a Practical Standpoint

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D. Van Nostrand Company, 1900 - Blowpipe - 414 pages

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Page 129 - Co obscures the tests, dissolve the substance in borax on charcoal to saturation, and treat for five minutes in hot RF If a visible button results, separate it from the borax, and treat with S. Ph. in the OF, replacing the S. Ph. when a color is obtained. If no visible button results, add either a small gold button or a few grains of test lead.
Page 115 - The residual button will be bluish-green when melted, will dissolve in the slag and color it red upon application of the OF, or may be removed from the slag and be submitted to either the S. Ph. or the flame test. FLUORINE, F. Etching Test. — If fluorine is released it will corrode glass in cloudy patches, and in presence of silica there will be a deposit on the glass. According to the refractoriness of the compound the fluorine may be released : (a) In closed tube by heat.
Page 121 - Open Tube. — Suffocating fumes. Some sulphates are unaffected. In Closed Tube. — May have sublimate red when hot, yellow cold, or sublimate of undecomposed sulphide, or the substance may be unaffected. With Soda and Silica (equal parts). — A yellow or red bead. To Determine whether Sulphide or Sulphate. — Fuse with soda on platinum foil. The sulphide only will stain silver. Tellurium, Te. On Coal. — Volatile white coat with red or yellow border. If the fumes are caught on porcelain, the...
Page 128 - S. and with yellow fringe ; but if quickly heated, the coat formed is pale yellow and black. Confirmation Hg. — If the substance is heated gently in a closed tube or matrass with dry soda or litharge, a mirror-like sublimate will form, which may be collected into little globules of Hg by rubbing with a match end. The test with bismuth flux on charcoal yields only a faint yellow coat. Bi. — Bright chocolate-brown coat, with sometimes a reddish fringe.
Page 117 - Make into a paste with boracic acicVflux and water, and fuse in the blue flame. Just after the flux fuses the red flame will appear. MAGNESIUM, Mg. On Coal with Soda. — Insoluble, and not absorbed by the coal. With Borax or S. Ph. — Clear and colorless can be flamed opaquewhite. With Cobalt Solution* — Strongly heated becomes a pale flesh color.
Page 116 - May be faded from S. Ph. bead by RF Nickel — May be faded from borax bead by RF Tungsten or Titanium. — The S. Ph. bead in RF will be reddish brown instead of blue or violet. Uranium. — As with chromium. Alloys, Sulphides, Arsenides, etc. — Roast, treat with borax on coal in RF, then treat borax in RF to remove reducible metals.
Page 112 - ... Lead. — Dissolve coat in S. Ph. as above. BORON, B. All borates intumesce and fuse to a bead. Flame. — Yellowish green. May be assisted by : (a) Moistening with H,SO4; (fi) Mixing to paste with water, and boracic acid flux (4*4 pts.
Page 119 - Continue the reduction, and : With Gold. — Treat the gold alloy on coal with S. Ph. in strong OF With Lead. — Scorify button with boracic acid to small size, complete the removal of lead by OF on coal, and treat residual button with S. Ph. in OF Arsenic. — Roast thoroughly, treat with borax in RF as long as it shows color, treat residual button with S.
Page 115 - Violet, choking vapor and brown sublimate. In Open Tube, with equal parts Bismuth Oxide, Sulphur, and Soda. — A brick-red sublimate. With Starch Paper. — The vapor turns the paper dark purple Interfering Elements. Silver. — The iodide melts in KHSO4 to a dark-red globule, yellow on cooling, and unchanged by sunlight.
Page 122 - With Borax. — OF Yellow hot, colorless cold. RF Brown to black and opaque. With S. Ph. — OF Yellowish green hot, colorless cold. (Crushed between damp unglazed paper becomes red, brown, purple, or blue, according to amount present.) RF Emerald-green.

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