Description

2-[(5-Bromo-2-Pyridylazo]-5-[n-Propyl-n-(3-Sulfopropyl)Amino]Phenol,Disodiumsalt,Dihydrate is a high-purity, water-soluble azo dye derivative primarily used as a sensitive chromogenic reagent for the spectrophotometric determination of trace metals. Its core value lies in forming highly stable, colored complexes with specific metal ions, enabling precise and selective analytical measurements. This compound is essential for research and quality control laboratories in the environmental, pharmaceutical, and metallurgical industries that require accurate metal ion quantification.

Application

• Spectrophotometric Reagent: Primary use as a chromogenic agent for the colorimetric detection and quantification of trace metal ions such as cobalt, nickel, copper, and zinc in aqueous solutions.
• Environmental Analysis: Employed in testing water and soil samples for heavy metal contamination to ensure compliance with environmental safety standards.
• Pharmaceutical QC: Used in the analysis of active pharmaceutical ingredients (APIs) and raw materials for catalytic metal impurities.
• Metallurgical Analysis: Applied in the determination of metal composition and purity in alloys, ores, and industrial process streams.
• Research & Development: Serves as a key reagent in academic and industrial research for developing new analytical methods and studying metal-ligand interactions.
• Biochemical Studies: Potential use as a staining agent or probe in biochemical assays for detecting metal-containing enzymes or proteins.

Basic Information

Product Name	2-[(5-Bromo-2-Pyridylazo]-5-[n-Propyl-n-(3-Sulfopropyl)Amino]Phenol,Disodiumsalt,Dihydrate
CAS No.	81608-06-2
Molecular Formula	C₁₇H₂₀BrN₅Na₂O₆S • 2H₂O
Molecular Weight	591.34 g/mol (anhydrous basis)
Synonyms	5-Bromo-PAPS; 5-Br-PAPS; 2-(5-Bromo-2-pyridylazo)-5-[N-propyl-N-(3-sulfopropyl)amino]phenol disodium salt dihydrate; 5-Bromo-2-pyridylazo-5-(N-propyl-N-sulfopropylamino)phenol disodium salt; Br-PAPS; PAPS, 5-Bromo derivative; Spectrophotometric reagent for cobalt; Cobalt indicator (Br-PAPS)
EINECS	Contact for details

Quality Control

Our 2-[(5-Bromo-2-Pyridylazo]-5-[n-Propyl-n-(3-Sulfopropyl)Amino]Phenol,Disodiumsalt,Dihydrate is manufactured under strict quality control protocols to ensure batch-to-batch consistency and high performance as an analytical reagent. Each lot undergoes rigorous testing, including purity assay by HPLC, identity confirmation (IR, UV-Vis), and moisture content analysis. A comprehensive Certificate of Analysis (COA) detailing all specifications is provided with every shipment to support your quality management systems.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry place at a controlled room temperature (15-25°C). Due to its hygroscopic nature, the container should be kept in a desiccated environment to prevent moisture absorption, which can affect the reagent's performance. Keep away from incompatible materials.

Specification

Item	Specification
Appearance	Dark red to reddish-brown crystalline powder
Identification (IR)	Conforms to reference spectrum
Identification (UV-Vis)	λmax in solution conforms
Assay (HPLC)	≥ 98.0%
Water Content (KF)	5.0 - 7.0% (corresponding to dihydrate)
Absorbance Ratio (A₄₅₀/A₅₈₀)	Within specified range
Solubility (in Water)	Clear, red solution at 1%
Heavy Metals (as Pb)	≤ 20 ppm

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