English name: Pyrogallic acid; Pyrogallol; 1,2,3-Trihydroxybenzene; 1,2,3-Benzenetriol Other names: Pyrogallol; Pyrogallol; Pyrogallol; 1,2,3-Pyrogallol; 1,2,3-Trihydroxybenzene; Gallophenol; Pyrogolic acid; Pyrogallol; Pyrogallonic acid Pyrogallol CAS number: 87-66-1 C6H6O3 = 126.11 Level: AR Content: ≥99.0% Melting point: 130 ～ 133 ℃ Chloride: ≤0.002% Gallic acid: qualified Residue on ignition: ≤0.025% Sulfate: ≤0.015% Water insoluble matter: ≤0.10% Properties: white shiny crystals. Odorless. It turned light gray in the exposed air. Heat slowly and begin to sublime. 1g is soluble in 1.7ml water, 1.3ml ethanol, 1.6ml ether, slightly soluble in benzene, chloroform and carbon disulfide. Its aqueous solution becomes deeper in the air and faster in alkaline solution. The relative density is 1.45. Boiling point 309 ℃. Low toxicity, LD50 (rat, oral) 789mg / kg. There are irritating uses: biochemical research. Metal complexing agent. Gravimetric determination of bismuth and antimony. A reducing agent for gold, silver, mercury salts, phosphomolybdic acid and phosphotungstic acid. Used for absorbing oxygen in gas analysis. Separate titanium, iron and aluminum when measuring tantalum and niobium. Used for color reaction of nitrite, molybdenum, niobium, titanium, cerium, bismuth, copper, vanadium, iron, iodate, etc.
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