Description

Carboxyarsenazo Iii is a high-purity, chromogenic organic reagent belonging to the arsenazo family of complexometric indicators. This compound is valued for its selective and sensitive colorimetric response, making it a critical tool for precise analytical determinations in research and industrial quality control. It is primarily utilized by analytical chemists and laboratory professionals in environmental monitoring, metallurgical analysis, and advanced material science.

Application

• Spectrophotometric Determination of Metals: Used as a sensitive chromogenic agent for the quantitative analysis of rare earth elements, thorium, uranium, and other metal ions in solution.
• Environmental Water Analysis: Employed in testing protocols to detect and quantify trace levels of heavy metal contaminants in water and wastewater samples.
• Geological and Metallurgical Assaying: Applied in the analysis of ores, alloys, and industrial process streams to determine specific metal content.
• Biochemical Research: Serves as a staining agent or probe in certain biochemical studies involving metal-binding proteins or cellular components.
• Quality Control Laboratories: Integral to standardized test methods within QC labs for pharmaceutical raw materials and high-purity chemical manufacturing.
• Teaching and Reference Standards: Used in academic and industrial settings to prepare calibration standards and for educational demonstrations in analytical chemistry.

Basic Information

Item	Detail
Product Name	Carboxyarsenazo Iii
CAS No.	3772-44-9
Molecular Formula	C₂₂H₁₆As₂N₄O₁₄S₂
Molecular Weight	776.34 g/mol
Synonyms	Carboxyarsenazo III; 2,7-Bis(2-arsonophenylazo)chromotropic acid; 2,2'-(1,8-Dihydroxy-3,6-disulfo-2,7-naphthalene-bis(azo))dibenzenearsonic acid; Arsenazo III carboxylic acid derivative; NSC 403319; p-Carboxyarsenazo III; Bis(2-arsonophenylazo)chromotropic acid
EINECS	Contact for details

Quality Control

Our Carboxyarsenazo Iii is manufactured under strict quality management protocols. Each batch undergoes comprehensive analytical testing, including HPLC for purity verification and identity confirmation by FT-IR, to ensure it meets the high standards required for precise analytical work. A Certificate of Analysis (COA) detailing purity, absorbance characteristics, and other critical parameters 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). Due to its hygroscopic (moisture-sensitive) nature, the container should be kept in a desiccated environment to prevent absorption of atmospheric moisture, which can affect performance.

Specification

Item	Specification
Appearance	Dark purple to brownish-purple powder
Identification (IR)	Conforms to reference spectrum
Purity (HPLC)	≥ 95.0%
Loss on Drying	≤ 2.0 %
Absorbance (Lambda max)	Conforms (Typically ~540-580 nm in complex)
Solubility	Soluble in water, alkaline solutions

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