METANIL YELLOW Property

Melting point:

>250°C

Boiling point:

325℃[at 101 325 Pa]

Density 

0.488[at 20℃]

vapor pressure 

0Pa at 25℃

storage temp. 

room temp

solubility 

25g/l

Colour Index 

13065

form 

Powder

color 

Orange

PH

10 (10g/l, H2O, 20℃)

PH Range

Red (1.2) to yellow (2.3)

Water Solubility 

Soluble in water (25g/L).

λmax

414nm, 435nm

Merck 

14,5928

BRN 

3831568

Major Application

Display device, nanoparticles, optical sensors, batteries, lithographic printing plates, inks, highlighters, children’s coloring books, floor coatings, disinfectants, dyes, personal care products, cosmetics, food storage, antiseptic, dental impressionmaterials

LogP

0.137 at 25℃

CAS DataBase Reference

587-98-4(CAS DataBase Reference)

EPA Substance Registry System

C.I. Acid Yellow 36, monosodium salt (587-98-4)

Safety

Hazard Codes 

Xi

Risk Statements 

43-36/37/38

Safety Statements 

22-24/25-36/37-36-26

WGK Germany 

2

RTECS 

DB7329500

TSCA 

Yes

HS Code 

32041200

Toxicity

LD50 orally in Rabbit: > 2000 mg/kg LD50 dermal Rat > 2000 mg/kg

Hazard and Precautionary Statements (GHS)

Symbol(GHS)

Signal word

Danger

Hazard statements

H318Causes serious eye damage

H412Harmful to aquatic life with long lasting effects

Precautionary statements

P273Avoid release to the environment.

P280Wear protective gloves/protective clothing/eye protection/face protection.

P305+P351+P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.

P501Dispose of contents/container to..…

METANIL YELLOW Chemical Properties,Usage,Production

Description

Metanil yellow is a yellow monoazo dye. This coloring agent is used in leather and wood stains, and was also employed as a food dye in India.

Chemical Properties

orange powder

Uses

dye used in leather; as indicator (pH) in laboratories

Uses

Metanil Yellow is used as indicator. Metanil yellow is useful in spectrophotometric methods to determine the presence of trace amounts of nitrates and nitrites in solution. The method utilizes the fact that potassium bromate can catalyze the discoloring of Metanil yellow which can then be analyzed by spectrophotometry.

Uses

As indicator in 0.1% solution, of which 2 drops are required for 10 ml liquid. pH: 1.2 red to 2.3 yellow.

Definition

ChEBI: An organic sodium salt having 3-[(4-anilinophenyl)diazenyl]benzene-1-sulfonate as the counterion. Used in one variant of Masson's trichrome to stain collagen yellow in contrast to the red muscle, but is not in common used.

General Description

Metanil yellow is an azo dye, which is used as a counterstain in PAS (periodic acid-Schiff) or iron-hematoxylin stained sections to increase contrast. At pH 1.2, metanil yellow is red in color, whereas in pH 2.3, it is yellow in color.

Flammability and Explosibility

Not classified

Contact allergens

Metanil yellow is a yellow monoazoic dye. This color ing agent is used in leather and wood stains, and is also employed as a food dye in India.

Biochem/physiol Actions

Metanil yellow is an azo dye. It is used as a counterstain in PAS (periodic acid-Schiff)/iron-hematoxylin stained sections to increase contrast. Metanil yellow changes its color from red at pH 1.2 to yellow at pH 2.3.

Safety Profile

Moderately toxic by intraperitoneal route. Experimental reproductive effects. Human mutation data reported. When heated to decomposition it emits toxic fumes of SOx, NOx, and NazO. See also AROMATIC AMINES and SULFONATES.

Purification Methods

It can be salted out from water three times with sodium acetate, then repeatedly extracted with EtOH [McGrew & Schneider J Am Chem Soc 72 2547 1950]. [Beilstein 16 II 168.]

Properties and Applications