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General Remarks on the Development Present State and Methods of Spot Test
TESTS FOR METALS
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acid test solution acidified added alcoholic solution aldehyde alizarin alkali aluminum amines ammonia ammonium anal barium benzidine bismuth blank test blue color bromine brown calcium capillary carbon disulfide Chem chromate cobalt color indicates complex compounds conc Concentration Limit containing copper crucible cyanide detected dilute dimethylglyoxime dissolved evaporated Feigl ferric ferrocyanide filter paper fleck fluoride formation formed heated hydrochloric acid hydrogen peroxide insoluble interfere iodide iodine iodine-azide ions iron Limit of Identification magnesium manganese mercury metals microcrucible Mikrochemie minutes mixture molybdate neutral nickel nitric acid oxidation paper impregnated permanganate phosphomolybdic phosphomolybdic acid placed on filter platinum potassium potassium ferrocyanide precipitate presence Procedure—A drop react reagent reagent solution red color reduced rhodanine salts sample sensitive small amounts sodium hydroxide solid soluble solution is mixed solution is placed spot plate spot reactions spot test sulfate sulfide sulfuric acid test tube thiocyanate thiosulfate tion treated violet color yellow zinc