Description

Chlorophosphonazo I is a high-purity chromogenic reagent and analytical standard widely used in complexometric titrations and spectrophotometric analysis. Its primary value lies in its exceptional selectivity and sensitivity as a metallochromic indicator for specific metal ions, particularly in research and quality control environments. This product is essential for analytical chemists, research laboratories, and industrial QC departments involved in the precise determination of rare earth elements, zirconium, hafnium, and other metals.

Application

• Spectrophotometric Reagent: Used for the sensitive colorimetric detection and quantification of metal ions such as zirconium(IV), hafnium(IV), and rare earth elements in solution.
• Complexometric Indicator: Serves as a metallochromic indicator in EDTA titrations for the determination of various metal cations, offering a sharp color change at the endpoint.
• Analytical Research & Development: A critical tool in method development for novel analytical procedures targeting specific metal complexes.
• Geochemical & Environmental Analysis: Employed in the analysis of soil, water, and mineral samples for trace metal content.
• Quality Control (QC) in Metallurgy: Used to assay purity and composition in alloys, catalysts, and high-purity metal production.
• Pharmaceutical Impurity Testing: Potential application in testing for metallic catalyst residues in active pharmaceutical ingredients (APIs).
• Teaching & Reference Standard: Used in university laboratories and for calibrating analytical instruments.

Basic Information

Product Name	Chlorophosphonazo I
CAS No.	85561-96-2
Molecular Formula	C22H16Cl2N4O14P2S2
Molecular Weight	757.26 g/mol
Synonyms	3,6-Bis((4-chloro-2-phosphonophenyl)azo)-4,5-dihydroxy-2,7-naphthalenedisulfonic acid; Chlorophosphonazo I; CPA I; 2,7-Bis[(4-chloro-2-phosphonophenyl)azo]-1,8-dihydroxynaphthalene-3,6-disulfonic acid; Chlorophosphonazour I; Spectrophotometric reagent for zirconium; Zirconon I; (4-Chloro-2-phosphonophenyl)azo derivative.
EINECS	Contact for details

Quality Control

Every batch of Chlorophosphonazo I is manufactured and tested under a strict quality management system. We guarantee high lot-to-lot consistency, with purity typically exceeding 95% (HPLC). Our products undergo rigorous quality testing to ensure compliance with industry standards. Certificates of Analysis (COA) detailing identity, purity, and other critical parameters are available upon request.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry place at a controlled room temperature (15-25°C). Keep the container sealed to protect this light-sensitive and moisture-sensitive compound from degradation. Store away from strong oxidizing agents.

Specification

Item	Specification
Appearance	Dark purple to brownish-black powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 2.0 %
Absorbance (Lambda max)	Conforms
Solubility	Soluble in water, alkaline solutions

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