Description

Chromeazurol B is a high-purity metallochromic indicator and complexometric reagent. Its primary value lies in its selective colorimetric properties for the detection and quantification of specific metal ions, particularly aluminum and beryllium, in analytical chemistry. This compound is essential for laboratories and industrial facilities requiring precise metal analysis, quality control, and research in fields such as environmental monitoring, metallurgy, and pharmaceutical testing.

Application

• Spectrophotometric Analysis: As a sensitive chromogenic agent for the determination of aluminum (Al³⁺) and beryllium (Be²⁺) ions in aqueous solutions.
• Complexometric Titration: Used as a metallochromic indicator in EDTA titrations for metals that form colored complexes.
• Water and Environmental Testing: Employed in procedures to detect trace metal contaminants in water, soil, and industrial effluent samples.
• Pharmaceutical QC: Applied in the analysis of raw materials and finished products for residual metal catalyst content or impurities.
• Metallurgical Analysis: Facilitates the assay of aluminum and beryllium content in alloys, ores, and refining processes.
• Research & Development: Serves as a key reagent in chemical research for developing new analytical methods and studying metal-ligand interactions.

Basic Information

Product Name	Chromeazurol B
CAS No.	1796-92-5
Molecular Formula	C23H13Cl2Na3O9S
Molecular Weight	605.26 g/mol
Synonyms	Chrome Azurol B; Chromazurol B; Mordant Blue 29; C.I. 43825; Aluminon; 3-[Bis(3-carboxy-4-hydroxyphenyl)methylene]-6-oxo-1,4-cyclohexadiene-1-carboxylic acid trisodium salt; 5-[(3-Carboxy-4-hydroxyphenyl)(3-carboxy-4-oxo-2,5-cyclohexadien-1-ylidene)methyl]-2-hydroxybenzoic acid trisodium salt; Chromeazurol S (related compound, verify specific isomer).
EINECS	217-280-8

Quality Control

Our Chromeazurol B is manufactured under strict quality management systems. Each batch undergoes rigorous analytical testing to ensure high purity, consistent performance, and compliance with reagent-grade specifications. Key parameters including assay (purity), absorbance characteristics, and solubility are verified. A comprehensive Certificate of Analysis (COA) detailing all test results is provided with every shipment to guarantee traceability and support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). Keep away from incompatible materials. Due to its light-sensitive nature, prolonged exposure to direct light should be avoided to maintain stability and performance.

Specification

Item	Specification
Appearance	Brownish-red to dark brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 5.0%
Absorbance (λ max)	Conforms to reference
Solubility (in Water)	Clear, red solution
Heavy Metals (as Pb)	≤ 20 ppm

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