Description

Sodium Hydrogen 7,7'-(Carbonyldiimino)Bis(4-Hydroxynaphthalene-2-Sulphonate) is a high-purity, water-soluble organic salt characterized by its distinctive naphthalene-based structure. This compound is valued for its strong chelating properties and its ability to form stable complexes with various metal ions, making it a critical component in analytical and industrial chemistry. It is primarily sought by manufacturers and R&D laboratories in the chemical synthesis, dye, and analytical reagent sectors for its precise performance.

Application

• Analytical Chemistry Reagent: Used as a sensitive colorimetric indicator and complexing agent in the spectrophotometric determination of trace metal ions.
• Dye Intermediate: Serves as a key precursor in the synthesis of specialized azo dyes and pigments, contributing to color fastness and stability.
• Chelating Agent: Employed in water treatment formulations and industrial cleaning processes to sequester and control problematic metal ions like calcium and magnesium.
• Pharmaceutical Research: Utilized in the development and analysis of certain pharmaceutical compounds due to its specific molecular interactions.
• Photographic Chemicals: Acts as a component in certain photographic developers and sensitizers.
• Laboratory Standard: Provides a high-purity reference standard for calibration and quality control in analytical methods.

Basic Information

Product Name	Sodium Hydrogen 7,7'-(Carbonyldiimino)Bis(4-Hydroxynaphthalene-2-Sulphonate)
CAS No.	71550-28-2
Molecular Formula	C21H13N2NaO11S2 • xH2O
Molecular Weight	556.45 (Anhydrous basis)
Synonyms	7,7'-(Carbonyldiimino)bis(4-hydroxy-2-naphthalenesulfonic acid) disodium salt; Acid Chrome Blue K; Chromazurol S; Mordant Blue 29; C.I. 43825; Ericchrome Azurol B; Sodium 4,4'-bis(7-sulfo-2-hydroxy-1-naphthylazo)diphenylurea
EINECS	Contact for details

Quality Control

Our Sodium Hydrogen 7,7'-(Carbonyldiimino)Bis(4-Hydroxynaphthalene-2-Sulphonate) is manufactured under strict quality management protocols. Every batch undergoes rigorous analytical testing, including HPLC for purity and identity confirmation, to ensure it meets precise specifications for critical applications. A comprehensive Certificate of Analysis (COA) detailing all test results is provided with each shipment to guarantee traceability and compliance.

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). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept sealed to prevent absorption of atmospheric moisture, which can affect product performance and stability.

Specification

Item	Specification
Appearance	Dark brown to reddish-brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 5.0%
Water Solubility	Freely soluble
Heavy Metals (as Pb)	≤ 20 ppm

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