Natrium-3-hydroxy-4-[(1-hydroxy-2-naphthyl)azo]-7-nitronaphthalin-1-sulfonat

Bezeichnung:Natrium-3-hydroxy-4-[(1-hydroxy-2-naphthyl)azo]-7-nitronaphthalin-1-sulfonat

CAS-Nr1787-61-7

Englisch Name:Eriochrome Black T

CBNumberCB5457454

SummenformelC20H12N3NaO7S

Molgewicht461.38

MOL-Datei1787-61-7.mol

Synonyma

Natrium-3-hydroxy-4-[(1-hydroxy-2-naphthyl)azo]-7-nitronaphthalin-1-sulfonat

Natrium-3-hydroxy-4-[(1-hydroxy-2-naphthyl)azo]-7-nitronaphthalin-1-sulfonat physikalisch-chemischer Eigenschaften

Dichte	1.109 g/mL at 25 °C
Flammpunkt	185 °C
storage temp.	room temp
Löslichkeit	50g/l
Colour Index	14645
Aggregatzustand	Powder/Solid
pka	pK1:6.3;pK2:11.55 (25°C)
Wichte	1.109
Farbe	Brownish-black to black
PH	3.7 (10g/l, H2O, 20℃)
Geruch (Odor)	Odorless
Wasserlöslichkeit	50 g/L (20 ºC)
Merck	14,3667
BRN	4121162
Stabilität	Stable. Incompatible with strong oxidizing agents, strong reducing agents.
CAS Datenbank	1787-61-7(CAS DataBase Reference)
EPA chemische Informationen	C.I. Mordant Black 11, monosodium salt (1787-61-7)

Sicherheit

Kennzeichnung gefährlicher	Xi
R-Sätze:	36-36/37/38-36/38
S-Sätze:	39-26-37/39-24/25
RIDADR	3077
WGK Germany	2
RTECS-Nr.	QK2197000
TSCA	Yes
HazardClass	6.1
PackingGroup	III
HS Code	32041900
Toxizität	LD50 oral in rat: 17590mg/kg

Gefahreninformationscode (GHS)

Eriochrome Black T Chemische Eigenschaften,Einsatz,Produktion Methoden

R-Sätze Betriebsanweisung:
R36:Reizt die Augen.
R36/37/38:Reizt die Augen, die Atmungsorgane und die Haut.
R36/38:Reizt die Augen und die Haut.
S-Sätze Betriebsanweisung:
S39:Schutzbrille/Gesichtsschutz tragen.
S26:Bei Berührung mit den Augen sofort gründlich mit Wasser abspülen und Arzt konsultieren.
S37/39:Bei der Arbeit geeignete Schutzhandschuhe und Schutzbrille/Gesichtsschutz tragen.
Chemische Eigenschaften
black powder
Verwenden
Eriochrome^? Black T has been used to determine the concentration of Ca²⁺ using complexometric titration method.
Verwenden
Eriochrome 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.
Verwenden
To 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.
synthetische
4-Amino-3-hydroxy-7-nitronaphthalene-1-sulfonic acid diazotization, and Naphthalen-1-ol?coupling.
Allgemeine Beschreibung
Eriochrome^? 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.

Properties and Applications

blue 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
Standard	Ironing Fastness	Light Fastness	Alkali	Acid	Persperation Fastness	Soaping	Water
ISO	4-5	7	5	5	5	5	5
AATCC	4-5	7	4-5		5	5	5

läuterung methode
The 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.]

Eriochrome Black T Upstream-Materialien And Downstream Produkte

Natrium-3-hydroxy-4-[(1-hydroxy-2-naphthyl)azo]-7-nitronaphthalin-1-sulfonat Anbieter Lieferant Produzent Hersteller Vertrieb Händler.

1787-61-7, Eriochrome Black T Verwandte Suche:

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