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Eriochrome blue-black B (C.I. 14640)

metal indicator

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Synonym(s):
Eriochrome blue-black B (C.I. 14640), 2-Hydroxy-1-(1-hydroxy-2-naphthylazo)-naphthalene-4-sulfonic acid sodium salt
Empirical Formula (Hill Notation):
C20H13N2NaO5S
CAS Number:
Molecular Weight:
416.38
EC Index Number:
222-639-6

Quality Level

form

solid

potency

>5000 mg/kg LD50, oral (Rat)

loss

≤10% loss on drying, 110°C

pH

9.5 (20 °C, 10 g/L in H2O)

solubility

20 g/L

bulk density

540 kg/m3

λmax

634-644 nm (buffer pH 10.0)

storage temp.

15-25°C

InChI

1S/C20H14N2O5S.Na/c23-17-11-18(28(25,26)27)14-7-3-4-8-15(14)19(17)22-21-16-10-9-12-5-1-2-6-13(12)20(16)24;/h1-11,21,24H,(H,25,26,27);/q;+1/p-1/b22-19-;

InChI key

YRFCCVCSEVISHI-GXTSIBQPSA-M

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This Item
1.031701.02498M1782
Chromeazurol B

Sigma-Aldrich

M1782

Chromeazurol B

pH

9.5 (20 °C, 10 g/L in H2O)

pH

3.7 (20 °C, 10 g/L in H2O)

pH

3.6 (20 °C, 10 g/L in H2O)

pH

-

solubility

20 g/L

solubility

50 g/L

solubility

-

solubility

water: 1 mg/mL, slightly hazy, orange

λmax

634-644 nm (buffer pH 10.0)

λmax

612-616 nm (buffer pH 10.0)

λmax

-

λmax

-

storage temp.

15-25°C

storage temp.

15-25°C

storage temp.

2-30°C

storage temp.

room temp

Quality Level

200

Quality Level

200

Quality Level

200

Quality Level

200

Analysis Note

Identity (UV/VIS-Spectrum): passes test
Absorption maximum λmax. (buffer pH 10.0): 634 - 644 nm
Spec. Absorptivity A 1%/1cm (λmax; 0.025 g/l; buffer pH 10.0; calculated on anhydrous substance): 220 - 320
Loss on drying (110 °C): ≤ 10 %
Suitability as indicator (for metal titration): passes test

Pictograms

Exclamation mark

Signal Word

Warning

Hazard Statements

Hazard Classifications

Eye Irrit. 2

Storage Class Code

11 - Combustible Solids

WGK

WGK 3

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable


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