Description

Sulfonazo 3 is a high-purity analytical reagent and metallochromic indicator belonging to the sulfonated azo dye class. Its primary value lies in its selective and sensitive complexometric properties, making it essential for precise quantitative analysis of metal ions, particularly in aqueous systems. This compound is a critical tool for quality control laboratories and research facilities in the chemical, pharmaceutical, and environmental monitoring sectors requiring accurate titration endpoints.

Application

• Complexometric Titration Indicator: Used as a metallochromic indicator for the direct and back titration of various metal ions, including barium, strontium, and lead, with EDTA and related chelating agents.
• Spectrophotometric Analysis: Employed in the development of colorimetric assays for the quantitative determination of specific cations due to its distinct color change upon complexation.
• Water Hardness Testing: Applied in analytical methods for determining calcium and magnesium ion concentrations in water quality assessment.
• Research & Development: Serves as a key reagent in chemical research for studying metal-ligand interactions, coordination chemistry, and developing new analytical methodologies.
• Industrial Process Control: Utilized in monitoring metal ion levels in process streams within mining, metallurgy, and plating industries.

Basic Information

Product Name	Sulfonazo 3
CAS No.	1738-02-9
Molecular Formula	C22H16N4O11S2
Molecular Weight	576.51 g/mol
Synonyms	3,6-Bis[(2-arsonophenyl)azo]-4,5-dihydroxy-2,7-naphthalenedisulfonic Acid; Sulfonazo III; Arsenazo III; 2,7-Bis(2-arsonophenylazo)chromotropic Acid; 2,2'-(1,8-Dihydroxy-3,6-disulfo-2,7-naphthylene bis(azo))dibenzenearsonic Acid; Neothoron; NSC 163063
EINECS	217-098-8

Quality Control

Our Sulfonazo 3 is manufactured under strict quality management systems to ensure batch-to-batch consistency and reliability for analytical applications. Each lot undergoes comprehensive testing, including identification by FT-IR, purity assessment by HPLC, and verification of functional performance as an indicator. A detailed Certificate of Analysis (COA) documenting identity, assay, and impurity profiles is provided with every shipment to support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at a controlled room temperature (15-25°C). Keep the container sealed to protect the product from atmospheric moisture and contamination.

Specification

Item	Specification
Appearance	Dark brown to purple-brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 2.0 %
Residue on Ignition (Sulfated Ash)	≤ 0.5 %
Heavy Metals (as Pb)	≤ 20 ppm
Performance Test (Titration)	Clear, sharp color transition endpoint

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