Description

4-(2-Pyridylazo)Resorcinol Monosodium Salt Hydrate is a high-purity, water-soluble metallochromic indicator and complexometric reagent. Its primary value lies in its exceptional selectivity and sensitivity for the spectrophotometric determination of various metal ions, particularly cobalt, nickel, and zinc. This product is essential for analytical chemists and quality control laboratories in industries such as environmental testing, metallurgy, pharmaceuticals, and academic research.

Application

• Spectrophotometric Reagent: Primary use as a chromogenic agent for the quantitative analysis of trace metal ions like Co(II), Ni(II), Zn(II), Cd(II), and Fe(II).
• Complexometric Titration Indicator: Used as a visual endpoint indicator in EDTA titrations for metals, offering a sharp color change.
• Environmental Analysis: Detection and quantification of heavy metal contaminants in water, soil, and industrial waste samples.
• Metallurgical Testing: Assay of metal content in ores, alloys, plating baths, and refining processes.
• Pharmaceutical QC: Analysis of metal catalysts or impurities in active pharmaceutical ingredients (APIs) and excipients.
• Research & Development: Fundamental studies in coordination chemistry and the development of new analytical methods.
• Dye Intermediate: Potential use as a precursor in the synthesis of specialized dyes and pigments.

Basic Information

Product Name	4-(2-Pyridylazo)Resorcinol Monosodium Salt Hydrate
CAS No.	16593-81-0
Molecular Formula	C11H9N3O2Na · xH2O
Molecular Weight	238.20 (Anhydrous basis)
Synonyms	PAR Monosodium Salt; 4-(2-Pyridylazo)resorcinol sodium salt; PAR Sodium Salt; 1-(2-Pyridylazo)-2,4-dihydroxybenzene monosodium salt; 4-(2-Pyridylazo)resorcinol sodium salt hydrate; PAR Na Salt; PAN Related Compound (PAR); Spectrophotometric grade PAR.
EINECS	Contact for details

Quality Control

Our 4-(2-Pyridylazo)Resorcinol Monosodium Salt Hydrate is manufactured under strict quality management systems. Each batch is tested to ensure high purity and performance consistency suitable for analytical applications. A comprehensive Certificate of Analysis (COA) detailing identity, purity, assay, and related substances is provided with every shipment to support your quality assurance protocols.

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). Keep the container tightly sealed to protect from moisture.

Specification

Item	Specification
Appearance	Orange to red-brown crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0% (on anhydrous basis)
Water Content (KF)	≤ 10.0%
Absorbance Ratio (λmax)	Meets internal standard for chromophore purity
Solubility (1% in Water)	Clear, orange-red 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.