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1141-59-9 - 4-(2-Pyridylazo)resorcinol, 99% - PAR - L09667 - Alfa Aesar

L09667 4-(2-Pyridylazo)resorcinol, 99%

CAS Number

Size Price ($) Quantity Availability
1g 19.80
5g 63.10
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4-(2-Pyridylazo)resorcinol, 99%


Chemical Properties

Formula Weight
Melting point
ca 187° dec.
Soluble in water (partly), and ethanol (slightly). Insoluble in ether, and low-polarity solvents.


4-(2-Pyridylazo)resorcinol is used in studies of zinc release from Escherichia coli aspartate transcarbamoylase. It is used in cloud point extraction of copper, zinc, cadmium, and nickel in water samples. It is used in the chelate titration of aluminum, mercury, lead and nickel. It is employed as reagent in the colorimetric analysis of gold, cobalt, chromium, iron.


Incompatible with oxidizing agents. Store in cool place. Keep container tightly closed in a dry and well-ventilated place. Store away from oxidizing agents.

Literature References

John B. Hunt; Sue H. Neece; Ann Ginsburg. The use of 4-(2-pyridylazo)resorcinol in studies of zinc release from Escherichia coli aspartate transcarbamoylase.Analytical Biochemistry.1985, 146 150-157.

Edson Luiz Silva; Paulo dos Santos Roldan; Maria Fernanda Giné. Simultaneous preconcentration of copper, zinc, cadmium, and nickel in water samples by cloud point extraction using 4-(2-pyridylazo)-resorcinol and their determination by inductively coupled plasma optic emission spectrometry.Journal of Hazardous Materials.2009, 171 (1-3), 1133-1138.

GHS Hazard and Precautionary Statements

Hazard Statements: H315-H319-H335

Causes skin irritation. Causes serious eye irritation. May cause respiratory irritation.

Precautionary Statements: P261-P280-P305+P351+P338-P304+P340-P362-P312-P321-P405-P403+P233-P501a

Avoid breathing dust/fume/gas/mist/vapours/spray. Wear protective gloves/protective clothing/eye protection/face protection. IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. IF INHALED: Remove to fresh air and keep at rest in a position comfortable for breathing. Take off contaminated clothing and wash before reuse. Call a POISON CENTER or doctor/physician if you feel unwell. Specific treatment (see label). Store locked up. Store in a well-ventilated place. Keep container tightly closed. Dispose of contents/container in accordance with local/regional/national/international regulations.

Other References

Harmonized Tariff Code


  • A11921

    L-(+)-Arabinose, 99%
  • A17475

    1-(2-Pyridylazo)-2-naphthol, 98%
  • 42773

    Xylenol Orange tetrasodium salt, 0.1% w/v aq. soln.
  • 81118

    Vanadium(V) trichloride oxide, V+5 28.5% min

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