Description

Arsenazo I CAS NO 520-10-5 is a high-purity analytical reagent and a metallochromic indicator belonging to the family of azo dyes. This compound is valued for its selective and sensitive colorimetric response to specific metal ions, making it a critical tool for quantitative analysis in research and industrial quality control. It is primarily required by analytical laboratories, chemical manufacturers, and research institutions involved in environmental testing, metallurgy, and inorganic chemistry.

Application

• Spectrophotometric Determination of Metals: Used as a chromogenic reagent for the quantitative analysis of thorium, uranium, and rare earth elements.
• Analytical Chemistry Research: Serves as a key indicator in complexometric titrations and metal ion detection studies.
• Environmental Monitoring: Employed in assays for detecting and measuring trace metal contaminants in water and soil samples.
• Geological and Metallurgical Analysis: Applied in the analysis of ores, alloys, and industrial process streams for specific metal content.
• Quality Control Reagent: Used in pharmaceutical and chemical manufacturing for impurity profiling related to metal catalysts or residues.
• Educational and Laboratory Use: A standard reagent for teaching and demonstrating principles of colorimetric analysis in academic settings.

Basic Information

Product Name	Arsenazo I
CAS No.	520-10-5
Molecular Formula	C22H18As2N4O14S2
Molecular Weight	776.37 g/mol
Synonyms	2,2'-[1,8-Dihydroxy-3,6-disulfo-2,7-naphthalene-bis(azo)]dibenzenearsonic Acid; Neothoron; Thoron; 2,7-Bis(2-arsonophenylazo)chromotropic Acid; Arsenazo I Disodium Salt; 3,6-Bis(2-arsonophenylazo)-4,5-dihydroxynaphthalene-2,7-disulfonic Acid; APANS; Uranon I
EINECS	208-293-0

Quality Control

Our Arsenazo I is produced under strict quality management protocols. Each batch undergoes rigorous analytical testing, including purity assay by HPLC and identity confirmation (IR, UV-Vis), to ensure it meets the high standards required for precise analytical work. A comprehensive Certificate of Analysis (COA) detailing purity, absorbance characteristics, and impurity profiles is provided with every shipment.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry place at a controlled room temperature (15-25°C). The product is light-sensitive and should be handled accordingly to maintain stability and performance.

Specification

Item	Specification
Appearance	Dark brown to reddish-brown powder
Identification (IR)	Conforms to structure
Identification (UV-Vis)	Conforms to reference spectrum
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 2.0 %
Absorbance (Lambda max)	Contact for details
Heavy Metals (as Pb)	≤ 20 ppm
Sulfated Ash	≤ 0.5 %

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