Eriochrome Black T

Eriochrome Black T Basic information
Product Name:Eriochrome Black T
Synonyms:1-naphthalenesulfonicacid,3-hydroxy-4-((1-hydroxy-2-naphthalenyl)azo)-7-nitro;1-naphthalenesulfonicacid,3-hydroxy-4-[(1-hydroxy-2-naphthalenyl)azo]-7-nitro;1-Naphthalenesulfonicacid,3-hydroxy-4-[(1-hydroxy-2-naphthalenyl)azo]-7-nitro-,monosodiumsalt;abcolchromeblacktn;abcolchromenavyrzn;acidchromeblacket;chromogeneblackt160;czernkwasowo-chromowaetn
CAS:1787-61-7
MF:C20H12N3NaO7S
MW:461.38
EINECS:217-250-3
Product Categories:Dyes and Pigments;Analytical Chemistry;Azo Compounds;Chelating Reagents;Naphthylazo Compounds
Mol File:1787-61-7.mol
Eriochrome Black T Structure
Eriochrome Black T Chemical Properties
density 1.109 g/mL at 25 °C
Fp 185 °C
storage temp. room temp
solubility 50g/l
Colour Index 14645
pkapK1:6.3;pK2:11.55 (25°C)
form Powder/Solid
Specific Gravity1.109
color Brownish-black to black
PH3.7 (10g/l, H2O, 20℃)
OdorOdorless
Water Solubility 50 g/L (20 ºC)
Merck 14,3667
BRN 4121162
Stability:Stable. Incompatible with strong oxidizing agents, strong reducing agents.
CAS DataBase Reference1787-61-7(CAS DataBase Reference)
EPA Substance Registry SystemC.I. Mordant Black 11, monosodium salt (1787-61-7)
Safety Information
Hazard Codes Xi
Risk Statements 36-36/37/38-36/38
Safety Statements 39-26-37/39-24/25
RIDADR 3077
WGK Germany 2
RTECS QK2197000
TSCA Yes
HazardClass 6.1
PackingGroup III
HS Code 32041900
ToxicityLD50 oral in rat: 17590mg/kg
MSDS Information
ProviderLanguage
C.I. 14645 English
ACROS English
ALFA English
Eriochrome Black T Usage And Synthesis
Chemical Propertiesblack powder
UsesEriochrome? Black T has been used to determine the concentration of Ca2+ using complexometric titration method.
UsesEriochrome black T is used as an indicator in analytical chemistry. It is also used in the detection of rare earth metals. It finds application in dyeing and printing of wool fabric, dyeing of silk and nylon as well as in leather dyeing. It can be used in the spectrophotometric determination of diphenhydramine hydrochloride in pharmaceutical preparations. As a complexometric indicator, it is useful in the determination of hardness of water.
UsesTo dye wool from an acid bath reddish-black, which can be converted to blue-black by afterchroming. As indicator in the determination of the total calcium and magnesium content of water.
Preparation4-Amino-3-hydroxy-7-nitronaphthalene-1-sulfonic acid diazotization, and Naphthalen-1-ol?coupling.
General DescriptionEriochrome? Black T is used as an indicator for complexometric titrations. It functions as an acid-base indicator. Eriochrome? Black T forms complex with Ca2+ and Mg2+, but it binds more strongly to Mg2+ ions.
Purification MethodsThe sodium salt (200g) is converted to the free acid by stirring with 500mL of 1.5M HCl, and, after several minutes, the slurry is filtered on a sintered-glass funnel. The process is repeated and the material is air dried after washing with acid. It is then extracted with *benzene for 12hours in a Soxhlet extractor, the *benzene solution is evaporated and the residue is air dried. A further desalting with 1.5M HCl (1L) is followed by crystallisation from dimethylformamide (in which it is very soluble) by forming a saturated solution at the boiling point, and allowing to cool slowly. The crystalline dimethylammonium salt so obtained is washed with *benzene and treated repeatedly with dilute HCl to give the insoluble free acid which, after air drying, is dissolved in alcohol, filtered and evaporated. The final material is air dried, then dried in a vacuum desiccator over Mg(ClO4)2. The purified acid is converted to the dimethylammonium salt with Me2NH. [Diehl & Lindstrom, Anal Chem 31 414 1959]. It is an indicator in the complexometry of alkaline earth metals. [Beilstein 16 IV 429.]
Properties and Applicationsblue black. Dark brown powder. Soluble in water for bordeaux red to jam red, moderate soluble in ethanol for brown light magenta, slightly soluble in Acetone. Dye in concentrated sulfuric acid for skipper, dilution to pale red light brown; In concentrated nitric acid to orange. Dye aqueous solution to join concentrated hydrochloric acid for sauce red; Join strong caustic into brown light magenta. Mainly used for all kinds of wool fabric dyeing, also used for silk, nylon and wool and a variety of fiber blended fabric dyeing, can be in chrome pretreatment of wool fabric direct printing. Is tasted can be used for indicator, also can be used for biological and fur dyeing.
Standard Ironing Fastness Light Fastness Fulling Persperation Fastness Soaping Water
Alkali Acid
ISO 4-5 7 5 5 5 5 5
AATCC 4-5 7 4-5 5 5 5
Nitrosobenzene Sodium 4-amino-1-naphthalenesulfonate BLACKBERRY Acid Black ATT ERIOCHROME BLACK A 4-Amino-benzenesulfonic acid monosodium salt Mordant Black 38 SULFONIC ACID Acid Black 26 Black Mordant Red 19 Naphthionic acid BLACKEYEDPEAS ACID BLACK 24 ERIOCHROME BLACK PV 2-NAPHTHYLAMINE-8-SULFONIC ACID CHLOROPHOSPHONAZO III ERIOCHROME BLACK T AND SODIUM CHLORIDE

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