Description

Stilbazo CAS NO 1571-36-4 is a specialized organic compound belonging to the azo dye and analytical reagent family. This chemical is valued for its role as a sensitive chromogenic agent, particularly in the complexometric titration and spectrophotometric determination of various metal ions. It serves as a critical component for quality control and research laboratories requiring precise analytical methods. Industries such as pharmaceuticals, metallurgy, and environmental testing utilize this reagent for its selective chelating properties.

Application

• Complexometric Titration Indicator: Primary use as a metallochromic indicator for the titration of metals like calcium, magnesium, and zinc with EDTA.
• Spectrophotometric Analysis: Employed in the development of colorimetric assays for the detection and quantification of trace metal ions in solution.
• Research & Development: Used in chemical research for studying metal-ligand interactions and developing new analytical methodologies.
• Water & Environmental Testing: Applied in laboratories for analyzing water hardness and monitoring heavy metal contamination in environmental samples.
• Pharmaceutical QC: Utilized in quality control processes to assay raw materials or finished products for metal content.
• Industrial Process Control: Integrated into process analytical technology (PAT) for real-time monitoring of metal ion concentrations in industrial streams.

Basic Information

Product Name	Stilbazo
CAS No.	1571-36-4
Molecular Formula	C20H14N4O8S2
Molecular Weight	502.48 g/mol
Synonyms	Stilbene-4,4'-bis[(1-azo)-3,4-dihydroxybenzene]-2,2'-disulfonic acid; 4,4'-Bis[(1-azo)-3,4-dihydroxybenzene]-2,2'-stilbenedisulfonic acid; STB; Stilbazo TS; Stilbazo indicator; 2,2'-(1,2-Ethenediyl)bis[5-[(2-hydroxy-5-sulfophenyl)azo]benzenesulfonic acid]; 3,3'-[(1E,2E)-1,2-Diphenylethene-1,2-diyl]bis(6-hydroxy-5-[(2-hydroxy-5-sulfophenyl)diazenyl]benzene-1-sulfonic acid)
EINECS	Contact for details

Quality Control

Our Stilbazo is manufactured under a strict quality management system. Each batch undergoes rigorous analytical testing, including HPLC for purity and identity confirmation via IR spectroscopy, to ensure it meets precise specifications for use as an analytical reagent. A comprehensive Certificate of Analysis (COA) detailing purity, assay, and impurity profiles is provided with every shipment to guarantee traceability and consistency for your critical applications.

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 tightly sealed when not in use to prevent degradation from atmospheric moisture and CO2.

Specification

Item	Specification
Appearance	Dark brown to reddish-brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Loss on Drying	≤ 2.0%
Residue on Ignition (Sulfated Ash)	≤ 0.5%
Absorbance (in solution)	Meets internal standard
Transition Point (as indicator)	Sharp and distinct color change

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