Scientific American Supplement, No. 362, December 9, 1882
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, to convert potassiumnitrate and chloride into the fixed sulphate. The sulphuric acid attacksthe manure energetically, and much facilitates the incineration, whichmay be effected at a dark red heat. The ignited portion (10 grms. ) isexhausted with boiling distilled water acidulated with hydrochloricacid, and the filtrate, when cold, is made up to 500 c. C. Of thissolution 50 c c. , representing 1 grm. Of the sample, are taken, and, after being heated until close upon ebullition, baryta-water i...s addeduntil a strong alkaline reaction is obtained. The sulphuric andphosphoric acids, alumina, magnesia, etc, are thus precipitated. Thefiltrate is heated to a boil, and mixed with ammonia and ammoniumcarbonate, to precipitate the excess of baryta in solution. The lasttraces of lime are eliminated by means of a few drops of ammoniumoxalate. The filtrate is evaporated down on the water-bath, and theammoniacal salts are expelled by carefully raising the temperature todull redness. After having taken up the residue in distilled water itis treated with platinum chloride, and the potassium chloro-platinateobtained is reduced with oxalic acid.
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