Description

Arsenazo I Trisodium Salt CAS NO 66019-20-3 is a high-purity analytical reagent belonging to the class of metallochromic indicators. This compound is valued for its selective and sensitive colorimetric response to specific metal ions, making it an essential tool for precise quantitative analysis. It is primarily used by research laboratories, quality control facilities, and industrial plants involved in chemical analysis, environmental monitoring, and metallurgy.

Application

• Spectrophotometric Determination of rare earth elements, thorium, and uranium in geological and environmental samples.
• Complexometric Titration Indicator for the volumetric analysis of metal ions in solution.
• Research & Development in inorganic and analytical chemistry for method development and validation.
• Quality Control (QC) Testing in the mining and metallurgical industries for ore and alloy analysis.
• Environmental Analysis for detecting and quantifying trace metal contaminants in water and soil.
• Educational Purposes in university laboratories for teaching advanced analytical techniques.

Basic Information

Product Name	Arsenazo I Trisodium Salt
CAS No.	66019-20-3
Molecular Formula	C22H15As2N4Na3O14S2
Molecular Weight	844.37 g/mol
Synonyms	Arsenazo I, Sodium Salt; 2,7-Bis(2-arsonophenylazo)-1,8-dihydroxynaphthalene-3,6-disulfonic Acid Trisodium Salt; 2,2'-(1,8-Dihydroxy-3,6-disulfo-2,7-naphthalene-bis(azo))dibenzenearsonic Acid Trisodium Salt; Neothorin; Thorin I; Uranon I; 3,6-Bis((2-arsonophenyl)azo)-4,5-dihydroxy-2,7-naphthalenedisulfonic Acid Trisodium Salt
EINECS	Contact for details

Quality Control

Our Arsenazo I Trisodium Salt is manufactured under strict quality management protocols. Each batch undergoes rigorous analytical testing to ensure high purity, consistent performance, and compliance with reagent-grade specifications. A comprehensive Certificate of Analysis (COA) detailing identity, purity, and impurity profiles is provided with every shipment to guarantee traceability and support your quality assurance requirements.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). This material is light-sensitive (store away from light). Keep away from incompatible materials.

Specification

Item	Specification
Appearance	Dark brown to reddish-brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 5.0%
Solubility	Soluble in water
Heavy Metals (as Pb)	≤ 20 ppm

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