Description

4-(3,5-Dibromo-2-Pyridylazo)-n-Ethyl-n-(3-Sulfopropyl)Aniline, Monosodium Salt, Monohydrate is a high-purity, water-soluble chromogenic reagent belonging to the pyridylazo family. This compound is valued for its exceptional sensitivity and selectivity as a colorimetric indicator in analytical chemistry, particularly for the detection and quantification of trace metal ions. It is primarily utilized by research institutions, analytical laboratories, and quality control departments within the chemical, pharmaceutical, and environmental monitoring industries.

Application

• Spectrophotometric Reagent: Used as a highly sensitive chromogenic agent for the colorimetric determination of transition and heavy metal ions (e.g., cobalt, nickel, copper, zinc) in aqueous solutions.
• Analytical Chemistry Research: Serves as a key component in developing novel analytical methods and assays for trace metal analysis in complex matrices.
• Environmental Testing: Employed in the detection and monitoring of metal pollutants in water, soil, and industrial effluent samples.
• Pharmaceutical QC: Applied in the analysis of metal catalyst residues or impurities in active pharmaceutical ingredients (APIs) and drug products.
• Biochemical Assays: Utilized in specific biochemical and clinical research applications where selective metal ion binding and visualization are required.
• Industrial Process Control: Integrated into automated or manual analytical systems for real-time monitoring of metal ion concentrations in chemical manufacturing processes.

Basic Information

Product Name	4-(3,5-Dibromo-2-Pyridylazo)-n-Ethyl-n-(3-Sulfopropyl)Aniline, Monosodium Salt, Monohydrate
CAS No.	100743-65-5
Molecular Formula	C₁₆H₁₈Br₂N₄NaO₄S • H₂O
Molecular Weight	564.21 g/mol (Anhydrous basis: 546.20 g/mol)
Synonyms	5-Br-PADAPS; 4-(3,5-Dibromo-2-pyridylazo)-N-ethyl-N-(3-sulfopropyl)aniline monosodium salt monohydrate; 3,5-Dibromo-PADAPS; DBPAESP; 2-(3,5-Dibromo-2-pyridylazo)-5-[N-ethyl-N-(3-sulfopropyl)amino]phenol monosodium salt; Spectrophotometric reagent 5-Br-PADAPS; Chromogenic reagent for cobalt; Trace metal analysis reagent.
EINECS	Contact for details

Quality Control

Our production of 4-(3,5-Dibromo-2-Pyridylazo)-n-Ethyl-n-(3-Sulfopropyl)Aniline, Monosodium Salt, Monohydrate adheres to stringent quality protocols to ensure batch-to-batch consistency and high performance as an analytical reagent. Each lot undergoes comprehensive testing, including purity assay by HPLC, identity confirmation (IR, UV-Vis), and verification of functional performance. A detailed Certificate of Analysis (COA) documenting all specifications is provided with every shipment to support your quality assurance and regulatory compliance needs.

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	Dark red to reddish-brown crystalline powder
Identification (IR)	Conforms to reference spectrum
Identification (UV-Vis)	λmax conforms
Assay (HPLC)	≥ 98.0%
Water Content (KF)	3.0 - 5.0% (Theoretical for monohydrate: ~3.2%)
Solubility (1% in Water)	Clear, red solution
Functional Test (Molar Absorptivity)	≥ 1.0 x 10⁵ L·mol⁻¹·cm⁻¹ (at λmax with target ion)

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