Description

Arsenazo Iii Sodium is a high-purity, water-soluble metallochromic indicator and complexometric reagent. This compound is critically important for the selective and sensitive spectrophotometric determination of various metal ions, particularly lanthanides and actinides, in analytical chemistry. It is essential for research laboratories, quality control facilities, and industrial processes requiring precise metal ion quantification and complexometric titrations.

Application

• Spectrophotometric Analysis: Primary reagent for the colorimetric detection and quantification of rare earth elements (e.g., lanthanum, cerium, thorium, uranium) in solution.
• Complexometric Titrations: Used as a metallochromic indicator in EDTA titrations for determining metal ion concentrations with high endpoint visibility.
• Environmental Testing: Employed in the analysis of water and soil samples for trace heavy metal and radioactive element contamination.
• Geochemical & Mining Research: Assists in the assay and process control of ores containing lanthanides and actinides.
• Nuclear Fuel Cycle Monitoring: Applied in analytical methods for monitoring specific actinides in nuclear industry process streams.
• Biochemical Research: Potential use as a probe for studying calcium and other divalent cation channels and binding sites in biological systems.
• Quality Control (QC) Laboratories: Standard reagent for calibrating instruments and validating analytical methods in pharmaceutical and industrial QC.

Basic Information

Product Name	Arsenazo Iii Sodium
CAS No.	138608-19-2
Molecular Formula	C22H16As2N4Na4O14S2
Molecular Weight	878.36 g/mol
Synonyms	Arsenazo III, Sodium Salt; 2,7-Bis(2-arsonophenylazo)chromotropic acid, tetrasodium salt; 2,2'-(1,8-Dihydroxy-3,6-disulfo-2,7-naphthalene-bis(azo))dibenzenearsonic acid tetrasodium salt; Neothorin; Uranon III; Thorin I; Bis(2-arsonophenylazo)chromotropic acid tetrasodium salt
EINECS	Contact for details

Quality Control

Our Arsenazo Iii Sodium is manufactured under strict quality management systems. Each batch undergoes rigorous analytical testing, including HPLC for purity and identity confirmation (IR, UV-Vis), to ensure it meets the high standards required for precise analytical applications. A comprehensive Certificate of Analysis (COA) detailing purity, assay, 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 (store away from light) and should be kept under dry conditions to prevent moisture absorption.

Specification

Item	Specification
Appearance	Dark purple to brownish-black powder
Identification (IR)	Conforms to reference spectrum
Identification (UV-Vis)	Conforms to reference
Assay (HPLC)	≥ 95.0%
Water Content (KF)	≤ 5.0%
Solubility (in Water)	Clear, purple solution
pH (1% Solution)	6.0 - 8.0
Heavy Metals (as Pb)	≤ 20 ppm

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