Description

Chromotropic acid disodium salt is a high-purity organic chemical compound, widely recognized as a key analytical reagent and chemical intermediate. Its primary commercial value lies in its exceptional selectivity as a chromogenic agent for the spectrophotometric determination of key analytes, offering high sensitivity and reliability. This product is essential for quality control laboratories and R&D departments in the pharmaceutical, chemical manufacturing, and environmental testing industries.

Application

• Spectrophotometric Analysis: Primary use as a chromogenic reagent for the determination of formaldehyde, nitrite, and other aldehydes.
• Pharmaceutical Testing: Used in analytical methods for drug impurity profiling and stability testing.
• Environmental Monitoring: Employed in water and air quality testing kits for detecting trace levels of pollutants.
• Dye Intermediate: Serves as a precursor in the synthesis of specific azo dyes and pigments.
• Research & Development: Utilized in biochemical and organic synthesis research as a specialized building block.
• Industrial Process Control: Applied in chemical manufacturing for in-process checks and final product quality assurance.

Basic Information

Product Name	Chromotropic Acid Disodium Salt
CAS No.	5808-22-2
Molecular Formula	C10H6Na2O8S2
Molecular Weight	364.24 g/mol
Synonyms	4,5-Dihydroxynaphthalene-2,7-disulfonic Acid Disodium Salt; 1,8-Dihydroxynaphthalene-3,6-disulfonic Acid Disodium Salt; Chromotropic Acid Sodium Salt; Disodium Chromotropate; Disodium 4,5-Dihydroxy-2,7-naphthalenedisulfonate; Naphthalenedisulfonic acid, 4,5-dihydroxy-, disodium salt
EINECS	227-363-3

Quality Control

Our Chromotropic acid disodium salt is manufactured under a strict quality management system. Each batch undergoes rigorous analytical testing to ensure it meets high-purity standards suitable for analytical and research applications. A comprehensive Certificate of Analysis (COA) detailing purity, identity, and impurity profiles is provided with every shipment to guarantee traceability and compliance.

Storage

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

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms
Assay (HPLC)	≥ 98.0%
Loss on Drying	≤ 2.0%
Water Solubility	Clear, colorless solution
Heavy Metals (as Pb)	≤ 20 ppm

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