Limit of Aluminum

Uses fluorescence spectroscopy after extraction with a chelating agent.

Dissolve 20.0 g of Sodium Chloride in 100 mL of water and add pH 6.0 acetate buffer.
Extract the solution three times with a 0.5% solution of 8-hydroxyquinoline in chloroform.
Combine the extracts and measure the fluorescence (Excitation: 392 nm, Emission: 518 nm).

Category	Guidance
Chloroform Safety	The Aluminum test uses chloroform, which is toxic and a suspected carcinogen. Use a fume hood and wear appropriate PPE.
Contamination	Use high-purity reagents and acid-washed glassware to avoid trace metal contamination.