Description

Chlorophosphonazo Iii CAS NO 77350-05-1 is a high-purity metallochromic indicator and complexometric reagent belonging to the phosphonazo family of dyes. This compound is valued for its exceptional selectivity and sensitivity in the spectrophotometric determination of specific metal ions, particularly in complex matrices. It is an essential analytical reagent for quality control and research laboratories in the metallurgical, environmental monitoring, and chemical manufacturing sectors.

Application

Chlorophosphonazo Iii is a specialized reagent with primary uses in analytical chemistry and related fields. Its key applications include:

• Spectrophotometric Analysis: As a selective chromogenic agent for the determination of rare earth elements, thorium, and uranium.
• Complexometric Titration: Serving as a metallochromic indicator in EDTA titrations for various metal ions.
• Environmental Testing: Used in assays for detecting and quantifying trace metal contaminants in water and soil samples.
• Geochemical Research: Analysis of mineral ores and geological samples for specific elemental composition.
• Quality Control Labs: Ensuring purity and compliance in the production of metals, alloys, and high-purity chemicals.
• Academic & Industrial R&D: Fundamental research in coordination chemistry and the development of new analytical methods.

Basic Information

Product Name	Chlorophosphonazo Iii
CAS No.	77350-05-1
Molecular Formula	C22H16Cl2N4O14P2S2
Molecular Weight	749.27 g/mol
Synonyms	Chlorophosphonazo III; 2,7-Bis(4-chloro-2-phosphonophenylazo)-1,8-dihydroxynaphthalene-3,6-disulfonic acid; CPA III; 2,7-Bis[(4-chloro-2-phosphonophenyl)azo]-1,8-dihydroxy-3,6-naphthalenedisulfonic acid; Chlorophosphonazo-III; Chlorphosphonazo III; Chlorophosphonazo 3; Spectrophotometric reagent CPA III
EINECS	Contact for details

Quality Control

Our Chlorophosphonazo Iii is manufactured under strict quality management systems. Each batch undergoes rigorous analytical testing, including HPLC for purity and identity confirmation via FT-IR and UV-Vis spectroscopy, to ensure it meets the high standards required for precise analytical work. A comprehensive Certificate of Analysis (COA) detailing purity, assay, and impurity profiles is provided with every shipment.

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 and should be handled accordingly to maintain stability and performance.

Specification

Item	Specification
Appearance	Dark green to black powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 2.0 %
Absorbance Ratio (λ max)	Within specified range
Solubility	Soluble in water, alkaline solutions

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