62337-00-2

Basic information

• Product Name: ARSENAZO III DISODIUM SALT
• Synonyms: Arsenazo III disodium salt p.a.;3,6-Bis[2-(2-arsonophenyl)diazenyl]-4,5-dihydroxy-2,7-naphthalenedisulfonic Acid SodiuM Salt;ARSENAZO III;ARSENAZO III DISODIUM SALT;2,7-BIS(O-ARSONOPHENYLAZO) CHROMOTROPIC ACID;2,7-BIS(2-ARSENOPHENYLAZO)-1,8-DIHYDROXYNAPHTALENE-3,6-DISULFONIC ACID, DISODIUM SALT;disodium 3,6-bis[(o-arsonophenyl)azo]-4,5-dihydroxynaphthalene-2,7-disulphonate;ARSENAZO III DISODIUM SALT, REAG.
• CAS NO: 62337-00-2
• Molecular Formula: C₂₂H₁₆As₂N₄O₁₄S₂*2Na
• Molecular Weight: 820.33
• EINECS: 216-788-6
• Product Categories: Aromatics;Sulfur & Selenium Compounds
• Mol File: 62337-00-2.mol
• Article Data: 0

Chemical Properties

• Melting Point: >320 °C(lit.)
• Appearance: Clear pink/
• Water Solubility: Soluble in water.
• CAS DataBase Reference: ARSENAZO III DISODIUM SALT(CAS DataBase Reference)
• NIST Chemistry Reference: ARSENAZO III DISODIUM SALT(62337-00-2)
• EPA Substance Registry System: ARSENAZO III DISODIUM SALT(62337-00-2)

Safety Data

• Hazard Codes: T,N
• Statements: 23/25-50/53
• Safety Statements: 20/21-28-45-60-61
• RIDADR: UN 3465 6.1/PG 2
• WGK Germany: 3
• HazardClass: 6.1
• PackingGroup: II
• Hazardous Substances Data: 62337-00-2(Hazardous Substances Data)

Usage

Chemical Properties

dark brown to brownish-black crystalline powder

Uses

Different sources of media describe the Uses of 62337-00-2 differently. You can refer to the following data:
1. Arsenazo-III is a diazo dye reagent used in the spectrophotometric determination of aluminum, gallium and indium. Toxic if swallowed. Toxic if inhaled. Very toxic to aquatic life.
2. Arsenazo III disodium salt is a diazo dye reagent used in the spectrophotometric determination of aluminum, gallium and indium. Further, it is used in the complexometric determination of lanthanides, thallium, scandium thorium, uranium and yttrium. In addition to this, it acts as a metal indicator and form specifically colored metal ion complexes in aqueous media.

Purification Methods

Contaminants include monoazo derivatives, starting materials for synthesis and by-products. It is partially purified by precipitation of the dye from aqueous alkali on addition of HCl. More thorough purification is achieved by taking a 2g sample in 15-25mL of 5% aqueous NH3 and filter. Add 10mL HCl (1:1) to the filtrate to precipitate the dye. Repeat the procedure and dissolve the solid dye (0.5g) in 7mL of a 1:1:1 mixture of n-propanol/conc NH3/water at 50o. After cooling, filter the solution and chromatograph the filtrate through a cellulose column using a 3:1:1 mixture of n-propanol/conc NH3/water as eluent. Collect the blue band and evaporate it to 10-15mL below 80o, then add 10mL of conc HCl to precipitate pure Arsenazo III. Wash it with EtOH and dry it in air [Borak et al. Talanta 17 215 1970]. The sodium salt is then obtained by dissolving it in the equivalent amount of dilute NaOH and freeze-drying. The purity of the dye can be checked by paper chromatography using M HCl as eluent. It is used for the estimation of Th, U, Zr, Cd and Zn [Michaylova & Yuroukova Anal Chim Acta 68 73 1974.]

InChI:InChI=1/C22H18As2N4O14S2.2Na/c29-21-18-11(9-16(43(37,38)39)19(21)27-25-14-7-3-1-5-12(14)23(31,32)33)10-17(44(40,41)42)20(22(18)30)28-26-15-8-4-2-6-13(15)24(34,35)36;;/h1-10,29-30H,(H2,31,32,33)(H2,34,35,36)(H,37,38,39)(H,40,41,42);;/q;2*+1/p-2