Elements of mineralogy, crystallography and blowpipe analysis from a practical standpoint .. . identified by other means. OPERATIONS OF BLOWPIPE ANALYSIS. loi These reactions are not successful on plaster tablets on accountof their non-absorbent character. Tests in Closed Tubes and Matrasses. The matrass is practically a glass tube closed at one end andblown to a bulb. In most cases better results are secured byusing a plain narrow tube about 4 inchesby ^ inch and closed at one end. Theusual purpose is to note the effects ofheat without essential oxidation; theyare also used for effecting fusi
Elements of mineralogy, crystallography and blowpipe analysis from a practical standpoint .. . identified by other means. OPERATIONS OF BLOWPIPE ANALYSIS. loi These reactions are not successful on plaster tablets on accountof their non-absorbent character. Tests in Closed Tubes and Matrasses. The matrass is practically a glass tube closed at one end andblown to a bulb. In most cases better results are secured byusing a plain narrow tube about 4 inchesby ^ inch and closed at one end. Theusual purpose is to note the effects ofheat without essential oxidation; theyare also used for effecting fusions with Fig. 306. such reagents as KHSO^ or KCIO3. Enough of the substance is slid downa narrow strip of paper, previously in-serted in the tube, to fill it to the heightof about one-half inch; the paper is with-drawn and the slightly inclined tiibeheated at the lower end gradually to ared heat. Fig. 306. The results maybe : evolution of water, odorous and non-odorous vapors, sublimates of variouscolors, decrepitation, phosphorescence, fusion, charring, changeof color, magnetization, Acid or alkaline moisture in the upper part of tube, .Odorless gas that assists combustion (nitrates, chloratesand per oxides), ...... Pungent gas that whitens lime water, . . Odors. Odor of prussic aid, ....... Odor of putrid eggs, ..... Odor that suffocates, fumes colorless, bleaching action,Odor that suffocates, fumes violet, . fumes brown, . fumes greenish yellow, . fumes etch the of nitric peroxide, fumes reddish-brown,Odor of ammonia, fumes colorless or white, . H,0. CN. H,S y SO, I.* Br. CI, F. NO, NH3 •t *I, Br, CI, F and NjOj are assisted by mixing substance with acid potassiumsulphate. t NHj, Hg, As, Cd are assisted by mixing with soda. 102 BLOWPIPE ANALYSIS. Sublimates. Sublimate white, fusing yellow fusing to drops, disagreeable odor,and volatile, .yellow hot, infusible,yellow hot, fusible,fusible, needle crystals,volatile, octahedral crystals,fusible, amorpho
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