Description

2-(5-Bromo-2-Pyridylazo)-5-[n-Propyl-n-(3-Sulfopropyl)Amino]Phenol Disodium Salt Dihydrate is a high-purity, water-soluble chromogenic reagent belonging to the pyridylazo family. This compound is valued for its high sensitivity and selectivity as a complexometric indicator in analytical chemistry, particularly for the spectrophotometric determination of trace metal ions. It is primarily used by analytical laboratories, research institutions, and manufacturers of diagnostic kits requiring precise and reliable colorimetric assays.

Application

• Spectrophotometric Reagent: Used for the sensitive colorimetric detection and quantification of transition and heavy metal ions (e.g., Co, Ni, Cu, Zn, Pd) in aqueous solutions.
• Analytical Chemistry Research: Serves as a key chromogenic agent in developing new analytical methods for environmental monitoring and material science.
• Water and Environmental Analysis: Employed in test kits and laboratory procedures for analyzing trace metal contaminants in water, soil, and industrial effluent samples.
• Biochemical Assays: Can be utilized in the development of in-vitro diagnostic (IVD) reagents for metal-dependent enzyme studies or metal ion detection in biological fluids.
• Quality Control Laboratories: Applied in pharmaceutical and industrial QC labs for the precise determination of metal catalyst residues or impurities.
• Chelation Titration Indicator: Functions as a metallochromic indicator in complexometric titrations with EDTA or similar chelating agents.

Basic Information

Item	Details
Product Name	2-(5-Bromo-2-Pyridylazo)-5-[n-Propyl-n-(3-Sulfopropyl)Amino]Phenol Disodium Salt Dihydrate
CAS No.	679787-08-7
Molecular Formula	C17H20BrN4Na2O5S • 2H2O
Molecular Weight	577.33 g/mol (anhydrous basis)
Synonyms	5-Bromo-PAPS; 5-Br-PAPS; 2-(5-Bromo-2-pyridylazo)-5-(N-propyl-N-sulfopropylamino)phenol disodium salt dihydrate; PAPS, 5-Bromo derivative; 5-Bromo-2-pyridylazo-5-(N-propyl-N-sulfopropylamino)phenol disodium salt; Spectrophotometric reagent 5-Br-PAPS; Chromogenic reagent for metals; CAS 679787-08-7
EINECS	Contact for details

Quality Control

Our production of 2-(5-Bromo-2-Pyridylazo)-5-[n-Propyl-n-(3-Sulfopropyl)Amino]Phenol Disodium Salt Dihydrate adheres to stringent in-house quality protocols to ensure batch-to-batch consistency and high performance. Each lot is characterized and tested to confirm identity, purity, and suitability for sensitive analytical applications. Certificates of Analysis (COA) detailing specific test results are 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). This product is hygroscopic (moisture-sensitive); ensure the container is sealed immediately after use to prevent absorption of atmospheric moisture, which may affect performance and stability.

Specification

Item	Specification
Appearance	Orange to dark red crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Water Content (KF)	5.0 - 7.0% (corresponding to dihydrate)
Absorbance Spectrum	Conforms to reference (λmax in specified solvent)
Solubility	Freely soluble in water; soluble in methanol
Heavy Metals (as Pb)	≤ 20 ppm

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