Aluminon

Aluminon
Other Names: Ammonium aurintricarboxylate; Mordant Red 3; Aluminon reagent
CAS Number: 569-58-4
Chemical Formula: C₂₂H₂₃N₃O₉
Molar Mass: 473.43 g/mol
Appearance: Red to dark red crystalline powder

Description:
Aluminon is the triammonium salt of aurintricarboxylic acid, used primarily as a complexometric reagent for detecting aluminum ions (Al³⁺). It forms a red-colored complex with aluminum, making it useful in qualitative and semi-quantitative analysis. Aluminon is also used in histology and colorimetric assays, particularly in educational and research settings.

Chemical and Physical Properties

• Density: Not well defined (powder)

• Melting Point: Decomposes >300°C

• Solubility in Water: Soluble, forms a red solution

• Solubility in Organic Solvents: Slightly soluble in alcohol

• Odor: Odorless

• Color Change with pH: Varies from red to yellow depending on acidity/basicity

Applications

• Analytical Chemistry: Used to detect trace amounts of aluminum by forming a colored complex.

• Histology: Applied as a staining reagent for identifying aluminum in tissue samples.

• Educational Demonstrations: Commonly used in teaching laboratories for metal ion detection.

• Research: Occasionally used in biological and environmental assays for metal ion analysis.

Safety

Signal Word: Warning

Handling and Storage

• Handling Precautions: Avoid formation of dust. Use in well-ventilated areas. Avoid contact with eyes, skin, and clothing.

• Storage Conditions: Store in a cool, dry place in tightly sealed containers. Keep away from strong oxidizing agents and moisture.