Eriochrome black T/1-(1-Hydroxy-2-naphthylazo)-6-nitro-2-naphthol-4-sulfonic acid sodium salt

English Name: Eriochrome Black T; 1-(1-Hydroxy-2-naphthylazo)-6-nitro-2-naphthol-4-sulfonic acid sodium salt； C.I.Mordant black II； C.I. 14645

Other names: electroless chrome black T; Wool chrome black T; Media Black T; Acid mordant black T; Sodium 1- (1-hydroxy-2-naphthylazo) - 6-nitro-2-naphthol-4-sulfonate

CAS No.: 1787-61-7

C20H12N3NaO7S=461.38

Grade: ind

Sensitivity test: acceptable

Water insoluble matter: ≤ 0.15%

 Physicochemical Properties: brownish black powder, soluble in hot water, cooled into a reddish brown solution, slightly soluble in alcohol, and brownish magenta; Slightly soluble in acetone. In case of excessive hydrochloric acid, brownish purple precipitation is generated; It is dry orange in concentrated nitric acid; In case of sodium hydroxide, it turns dark blue and then turns red. It dissolves in concentrated sulfuric acid to form a blue black solution, and forms a brown precipitate after dilution. The solubility in water (90 ℃) is 25g / L. When copper and iron are encountered during dyeing, the influence of color light is greater.

Purpose: biochemical research. Indicators for determination of water hardness, metal complex indicators, determination of calcium, magnesium, barium, iron, manganese, lead, scandium, strontium, zinc and zirconium

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