Limit of Aluminum
Uses fluorescence spectroscopy after extraction with a chelating agent.
Step-by-Step Instructions
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Dissolve 20.0 g of Sodium Chloride in 100 mL of water and add pH 6.0 acetate buffer.
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Extract the solution three times with a 0.5% solution of 8-hydroxyquinoline in chloroform.
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Combine the extracts and measure the fluorescence (Excitation: 392 nm, Emission: 518 nm).
Acceptance Criteria
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Fluorescence does not exceed that of the standard (NMT 0.2 ppm).
Tips and Cautions
|
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. |