Description

Trisodium 4-[(o-Arsonophenyl)Azo]-3-Oxidonaphthalene-2,7-Disulphonate CAS NO 53669-45-7 is a specialized organoarsenic azo dye compound, valued for its unique chromogenic and complexing properties. This chemical is engineered to deliver consistent performance as a sensitive analytical reagent and colorimetric indicator in demanding laboratory and industrial processes. It is primarily required by manufacturers and research facilities in the analytical chemistry, metallurgy, and water treatment sectors for precise detection and quantification applications.

Application

• Analytical Reagent: Used as a sensitive colorimetric indicator for the detection and determination of specific metal ions, such as zirconium, hafnium, and thorium, in solution.
• Metallurgical Analysis: Employed in the complexometric titration and spectrophotometric analysis of rare earth and refractory metals in ores and alloys.
• Water Quality Testing: Applied in environmental monitoring for the trace analysis of heavy metal contaminants in water samples.
• Research & Development: Serves as a key intermediate or reagent in chemical synthesis and methodological development within academic and industrial R&D labs.
• Dye Intermediate: Functions as a precursor in the synthesis of specialized azo dyes and pigments requiring specific light-fastness or metal-complexing characteristics.
• Chelating Agent: Utilized in processes requiring selective chelation or masking of particular metal ions.

Basic Information

Product Name	Trisodium 4-[(o-Arsonophenyl)Azo]-3-Oxidonaphthalene-2,7-Disulphonate
CAS No.	53669-45-7
Molecular Formula	C22H12AsN3Na3O11S2
Molecular Weight	695.36 g/mol
Synonyms	Arsenazo III; 2,7-Bis(2-arsonophenylazo)chromotropic acid trisodium salt; 2,2'-(1,8-Dihydroxy-3,6-disulfo-2,7-naphthalene-bis(azo))dibenzenearsonic acid trisodium salt; o,o'-Dihydroxy-p,p'-bis(arsonophenylazo)chromotropic trisodium salt; Trisodium 2,7-bis[(2-arsonophenyl)azo]-1,8-dihydroxynaphthalene-3,6-disulfonate; Neothorin; Uranon III; Thorin I
EINECS	Contact for details

Quality Control

Every batch of Trisodium 4-[(o-Arsonophenyl)Azo]-3-Oxidonaphthalene-2,7-Disulphonate is subjected to rigorous analytical testing to ensure it meets stringent purity and performance criteria for analytical reagent applications. Our quality assurance protocol includes identity confirmation, purity assay, and verification of key functional properties. Certificates of Analysis (COA) detailing lot-specific results are available upon request to support your quality documentation needs.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at a controlled room temperature (15-25°C). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed to prevent absorption of atmospheric moisture, which can affect purity and performance.

Specification

Item	Specification
Appearance	Dark red to brownish-red powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 5.0%
Heavy Metals (as Pb)	≤ 20 ppm
Arsenic (As) Content	Conforms to theoretical
Sensitivity Test	Passes (for specified metal ions)
Solubility	Soluble in water

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.