Description

Chlorophosphonazo Iii CAS NO 1914-99-4 is a high-purity metallochromic indicator and complexometric reagent, valued for its exceptional selectivity and sensitivity in analytical chemistry. Its primary commercial value lies in enabling precise and reliable detection and quantification of specific metal ions, particularly rare earth elements, in complex matrices. This product is essential for quality control laboratories, research institutions, and industrial facilities involved in metallurgy, environmental monitoring, and advanced material synthesis.

Application

• Spectrophotometric Determination of rare earth elements (e.g., Lanthanum, Cerium) and other metal ions in ores and alloys.
• Complexometric Titration Endpoint Indicator for enhanced accuracy in EDTA titrations within analytical chemistry workflows.
• Research & Development of novel analytical methods and sensor technologies in academic and industrial R&D labs.
• Environmental Analysis for trace metal detection and monitoring in water and soil samples.
• Quality Assurance/Quality Control (QA/QC) in metallurgical and chemical manufacturing processes.
• Pharmaceutical Analysis for potential use in testing catalyst residues or metal impurities in active pharmaceutical ingredients (APIs).

Basic Information

Product Name	Chlorophosphonazo Iii
CAS No.	1914-99-4
Molecular Formula	C22H16Cl2N4O14P2S2
Molecular Weight	757.36 g/mol
Synonyms	Chlorophosphonazo III; 3,6-Bis((4-chloro-2-phosphonophenyl)azo)-4,5-dihydroxy-2,7-naphthalenedisulfonic acid; CPA III; Chlorophosphonazo-3; 2,7-Bis[(4-chloro-2-phosphonophenyl)azo]-1,8-dihydroxynaphthalene-3,6-disulfonic acid; LZP; Azo-phosphonate indicator; Metallochromic indicator CPAIII
EINECS	217-637-7

Quality Control

Our Chlorophosphonazo Iii is manufactured under strict quality management systems to ensure batch-to-batch consistency and high performance. Each lot undergoes rigorous analytical testing, including HPLC for purity and identity confirmation via IR spectroscopy, to meet exacting standards for analytical reagent applications. A comprehensive Certificate of Analysis (COA) detailing purity, assay, and impurity profiles is provided with every shipment to support your quality documentation.

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). Keep away from heat sources and incompatible materials. Due to its light-sensitive nature, prolonged exposure to direct light should be avoided to maintain stability and performance.

Specification

Item	Specification
Appearance	Dark purple to black powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 95.0%
Loss on Drying	≤ 2.0 %
Solubility	Soluble in water, alkaline solutions
Heavy Metals (as Pb)	≤ 20 ppm

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