Description

Sulfonazo Iii, Titration Indicator For S O4 CAS NO 164581-28-6 is a specialized chromogenic reagent and metallochromic indicator designed for the sensitive and selective detection of sulfate ions (SO₄²⁻) in analytical titrations. Its primary value lies in providing a sharp, clear color change at the titration endpoint, enabling accurate and reliable quantitative analysis of sulfate content. This indicator is essential for quality control and research laboratories in industries such as water treatment, chemical manufacturing, pharmaceuticals, and environmental monitoring, where precise sulfate determination is critical.

Application

• Sulfate Titration in Water Analysis: Primary application for determining sulfate concentration in drinking, process, and wastewater to ensure compliance with regulatory standards.
• Quality Control in Chemical Production: Used to monitor and control sulfate impurity levels in raw materials, intermediates, and final chemical products.
• Pharmaceutical Analysis: Employed in the assay of sulfate salts used as excipients or active pharmaceutical ingredients (APIs) to meet pharmacopeial specifications (e.g., USP, EP).
• Environmental Soil and Sediment Testing: Facilitates the analysis of sulfate content in environmental samples for pollution assessment and remediation studies.
• Industrial Process Monitoring: Applied in continuous or batch process streams, such as in power generation or mining, to control sulfate levels that can cause scaling or corrosion.
• Research & Development: Serves as a key reagent in analytical method development and fundamental research involving sulfate ion chemistry and complexometric reactions.

Basic Information

Product Name	Sulfonazo Iii, Titration Indicator For S O4
CAS No.	164581-28-6
Molecular Formula	C₂₂H₁₆N₄O₁₀S₂
Molecular Weight	560.51 g/mol
Synonyms	Sulfonazo III; 2,7-Bis(2-sulfophenylazo)chromotropic acid; 2,7-Bis(4-sulfo-2-azophenyl)-1,8-dihydroxynaphthalene-3,6-disulfonic acid; 3,6-Bis[(2-sulfophenyl)azo]-4,5-dihydroxy-2,7-naphthalenedisulfonic acid; SPADNS derivative; Sulfate indicator; Barium sulfate titration indicator; Sulfonazo III for sulfate.
EINECS	Contact for details

Quality Control

Our Sulfonazo III indicator is manufactured under strict quality protocols to ensure batch-to-batch consistency and performance reliability. Each lot undergoes comprehensive analytical testing, including purity assessment by HPLC, identity confirmation by IR spectroscopy, and functional performance validation in standard sulfate titration methods. A detailed Certificate of Analysis (COA) is provided with every shipment, documenting all critical quality parameters. Our quality system supports compliance with relevant Good Manufacturing Practice (GMP) principles for laboratory reagents.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry place at a controlled room temperature (15-25°C). The product is light-sensitive (store away from light) as indicated by its chemical properties; prolonged exposure to light may degrade its performance. Keep the container tightly sealed when not in use to prevent contamination and moisture absorption.

Specification

Item	Specification
Appearance	Dark brown to black powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 2.0 %
Sulfate Sensitivity	Clear color transition at endpoint
Solubility	Soluble in water

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