Description

5-[[4,5-Dihydro-4-[(2-Hydroxy-3,5-Disulfophenyl)Azo]-5-Oxo-1H-Pyrazol]-1-Yl]-2-Hydroxybenzoic Acid Trisodium Salt is a high-purity, water-soluble azo dye intermediate and analytical reagent. This compound is valued for its strong chelating properties and vivid color, making it essential for precise colorimetric analysis and the synthesis of specialized dyes. It is primarily used by manufacturers and research laboratories in the analytical chemistry, textile dye, and specialty chemical sectors.

Application

• Colorimetric Reagent: Used as a sensitive and selective chromogenic agent for the spectrophotometric determination of metal ions, particularly aluminum and iron, in analytical chemistry and water quality testing.
• Textile Dye Intermediate: Serves as a key precursor in the synthesis of acid dyes and reactive dyes for coloring wool, silk, and nylon fibers.
• Biological Staining: Employed in histological and cytological staining procedures for microscopic analysis in life science research.
• Ink Formulation: Used in the production of specialized inks, including those for security printing and high-performance markers.
• Chelating Agent: Functions as a metal complexing agent in various industrial processes and laboratory applications.
• Research & Development: A vital chemical for R&D in organic synthesis, dye chemistry, and the development of new analytical methods.

Basic Information

Product Name	5-[[4,5-Dihydro-4-[(2-Hydroxy-3,5-Disulfophenyl)Azo]-5-Oxo-1H-Pyrazol]-1-Yl]-2-Hydroxybenzoic Acid Trisodium Salt
CAS No.	72152-57-9
Molecular Formula	C16H9N4Na3O11S2
Molecular Weight	566.35 g/mol
Synonyms	Aluminon Trisodium Salt; Aurintricarboxylic Acid Trisodium Salt (ATA); 5-[(3-Carboxy-4-hydroxyphenyl)(3-carboxy-4-oxo-2,5-cyclohexadien-1-ylidene)methyl]-2-hydroxybenzoic Acid Trisodium Salt; C.I. 43810; Ammonium Aurintricarboxylate (related compound); Aluminon; Aluminum reagent; 1,2-Dihydroxyanthraquinon-3-ylmethylamine N,N-diacetic Acid (common name for related structure).
EINECS	Contact for details

Quality Control

Our production of 5-[[4,5-Dihydro-4-[(2-Hydroxy-3,5-Disulfophenyl)Azo]-5-Oxo-1H-Pyrazol]-1-Yl]-2-Hydroxybenzoic Acid Trisodium Salt adheres to stringent quality protocols to ensure batch-to-batch consistency and reliability for sensitive applications like analytical testing. Each lot is characterized and tested against established specifications. Certificates of Analysis (COA) documenting purity, identity, and other critical parameters are provided to guarantee compliance with your technical 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). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed after opening to prevent absorption of atmospheric moisture, which can affect purity and performance.

Specification

Item	Specification
Appearance	Orange-red to brownish-red powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 5.0%
Water Solubility	Freely soluble
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.