Sulfonazo III [Spectrophotometric reagent for alkaline earth metals and indicator for the precipitation titration of SO4 with Ba] TCI A5010

Chemical Identity

CAS No.: 68504-35-8
PubChem: CID 135465064·SID 87563104
Formula: C22H12N4Na4O14S4
Molecular weight: 776.6 g/mol
Purity: >90.0%(HPLC)

Full identifiers (IUPAC, SMILES, InChIKey)

IUPAC: tetrasodium;4,5-dihydroxy-3,6-bis[(2-sulfonatophenyl)diazenyl]naphthalene-2,7-disulfonate
SMILES: C1=CC=C(C(=C1)N=NC2=C(C3=C(C(=C(C=C3C=C2S(=O)(=O)[O-])S(=O)(=O)[O-])N=NC4=CC=CC=C4S(=O)(=O)[O-])O)O)S(=O)(=O)[O-].[Na+].[Na+].[Na+].[Na+]
InChIKey: FCMRBZBGGXLKBC-UHFFFAOYSA-J

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Sulfonazo III is a spectrophotometric reagent widely used in analytical chemistry for detecting alkaline earth metals and as an indicator in precipitation titration of sulfate with barium. This compound plays a crucial role in laboratory settings by enabling precise and sensitive analysis through color changes or absorbance measurements using a spectrophotometer. It is a key component in qualitative and quantitative analysis, offering reliable results in various chemical investigations. Its ability to form complexes with specific metal ions allows for accurate detection even at low concentrations, making it indispensable in both academic and industrial laboratories.

The chemical properties of Sulfonazo III make it a preferred choice in analytical applications. It exhibits high sensitivity and selectivity, minimizing interference from other ions. Its stability under controlled conditions ensures consistent performance, which is essential for accurate and reproducible results. Additionally, Sulfonazo III demonstrates a strong response to alkaline earth metal ions, making it ideal for use in titration methods where visual or instrumental detection is required. These characteristics contribute to its widespread use in analytical chemistry.

In Indonesian laboratories, Sulfonazo III is commonly used in environmental, industrial, and educational research. It supports a variety of analytical tasks, including the determination of sulfate in water samples and the detection of metal ions in complex matrices. Its reliability and accuracy make it a valuable tool for both routine testing and advanced research projects.

TCI brochures (PDF)

Titration Reagents and TLC Stains 2026-05-07 · p. 10

Related TCI products

Precipitation Titration: Sulfonazo III is used to indicate the endpoint in sulfate titration with barium chloride, providing a clear color change for accurate measurement.
Environmental Analysis: It is employed in the detection of alkaline earth metals in water and soil samples, supporting environmental monitoring efforts.
Industrial Quality Control: Sulfonazo III helps in the analysis of metal content in industrial products, ensuring compliance with quality standards.
Educational Research: It is a key reagent in teaching laboratories, used to demonstrate spectrophotometric techniques and metal ion detection.
Chemical Analysis: Its sensitivity and selectivity make it suitable for quantitative analysis of metal ions in various chemical samples.

Brand	TCI
CAS number	68504-35-8
Molecular formula	—
Purity	—
Category	Analytical Chemistry > Analytical Reagents > Spectroscopy Reagents
Pack sizes	Available in various quantities as per supplier specifications
Physical form	Solid powder
Storage	Store in a cool, dry place away from light

Sulfonazo III should be stored in a cool, dry place away from direct light to maintain its chemical stability. It is recommended to use airtight containers to prevent moisture absorption, which could affect its performance. Due to its chemical nature, it should be handled with care, using appropriate personal protective equipment such as gloves and safety goggles. Avoid exposure to strong acids or bases, as they may alter its properties. In a laboratory setting, it should be kept in a well-ventilated area to ensure safe handling. Proper storage and handling are essential to preserve its analytical effectiveness and ensure accurate results in chemical experiments.

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Analytical Chemistry

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