Description

Chlorophosphonazo I is a high-purity chromogenic reagent and complexometric indicator widely used in analytical chemistry. Its primary value lies in its selective and sensitive colorimetric response to specific metal ions, enabling precise quantitative analysis. This compound is essential for researchers and quality control laboratories in the pharmaceutical, metallurgical, and environmental testing sectors who require reliable reagents for trace metal determination.

Application

• Spectrophotometric Determination of Rare Earth Elements: Used as a sensitive chromogenic agent for the analysis of lanthanides like lanthanum, cerium, and neodymium.
• Complexometric Titration Indicator: Serves as a metallochromic indicator for the titration of calcium, magnesium, and other metal ions with EDTA.
• Water and Environmental Analysis: Employed in testing protocols for detecting and quantifying trace heavy metals in water, soil, and industrial effluent samples.
• Pharmaceutical Quality Control: Utilized in assays to determine metal catalyst residues or impurities in active pharmaceutical ingredients (APIs) and excipients.
• Metallurgical Analysis: Applied in the analysis of alloy compositions and the purity assessment of high-purity metals.
• Research & Development: A key reagent in academic and industrial R&D for developing new analytical methods and studying metal-ligand interactions.

Basic Information

Item	Detail
Product Name	Chlorophosphonazo I
CAS No.	1938-82-5
Molecular Formula	C22H16ClN4O14PS4
Molecular Weight	757.00 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; NSC 403079; SPADNS derivative; Metallochromic indicator CPAI; Chlorphosphonazo I
EINECS	Contact for details

Quality Control

Our Chlorophosphonazo I is manufactured under a strict quality management system. Every batch undergoes comprehensive analytical testing, including HPLC for purity, IR for identification, and spectrophotometric validation of performance characteristics, to ensure it meets the high standards required for precise analytical work. A detailed Certificate of Analysis (COA) is provided with each shipment, confirming compliance with specified parameters.

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 red to brownish-red 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.