Description

8-Hydroxyquinoline-5,7-Disulphonic Acid is a versatile, water-soluble derivative of 8-hydroxyquinoline, distinguished by its two sulphonic acid groups which enhance its solubility and chelating properties. This compound is a critical analytical reagent and intermediate, valued for its ability to form stable, colored complexes with various metal ions. It is primarily sought after by manufacturers and laboratories in the analytical chemistry, pharmaceutical, and specialty chemical synthesis sectors for applications ranging from metal detection to the production of advanced materials.

Application

• Analytical Reagent: Used as a sensitive colorimetric and spectrophotometric reagent for the detection and quantitative determination of metal ions such as iron, aluminum, and magnesium.
• Pharmaceutical Intermediate: Serves as a key building block in the synthesis of more complex quinoline-based pharmaceutical compounds and active ingredients.
• Catalyst and Ligand: Acts as a chelating ligand in homogeneous catalysis and in the preparation of metal-organic frameworks (MOFs) or coordination polymers.
• Corrosion Inhibitor Formulation: Incorporated into formulations designed to protect metals from corrosion due to its strong metal-binding capacity.
• Dye and Pigment Intermediate: Utilized in the synthesis of certain azo dyes and functional pigments where its structure imparts specific color and stability properties.
• Water Treatment Agent: Employed in processes for sequestering or removing trace heavy metals from industrial wastewater.

Basic Information

Product Name	8-Hydroxyquinoline-5,7-Disulphonic Acid
CAS No.	31568-84-0
Molecular Formula	C9H7NO7S2
Molecular Weight	305.28 g/mol
Synonyms	8-Hydroxyquinoline-5,7-disulfonic Acid; 5,7-Disulpho-8-hydroxyquinoline; 8-Hydroxy-5,7-quinolinedisulfonic Acid; Ferron (reagent grade); Oxine-5,7-disulfonic Acid; 8-Quinolinol-5,7-disulfonic Acid; 5,7-Disulfo-8-hydroxyquinoline; 8-Hydroxyquinoline-5,7-disulfonate
EINECS	250-698-8

Quality Control

Our 8-Hydroxyquinoline-5,7-Disulphonic Acid is manufactured under a strict quality management system. Every batch undergoes rigorous analytical testing to ensure it meets high-purity standards suitable for reagent and industrial use. A comprehensive Certificate of Analysis (COA) detailing purity, identity, and impurity profiles is provided with each shipment to guarantee traceability and consistency for your critical processes.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). This product is hygroscopic (moisture-sensitive); ensure the container is kept tightly sealed to prevent absorption of atmospheric moisture which may affect product quality.

Specification

Item	Specification
Appearance	Yellow to yellowish-brown crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Loss on Drying	≤ 2.0%
Sulphated Ash	≤ 0.5%
Heavy Metals (as Pb)	≤ 20 ppm
Iron (Fe)	≤ 50 ppm

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