Neutralization Procedures:
General: Do neutralizations in a fume hood behind a safety shield, as fumes and heat may be generated.
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Wear lab coat or apron, gloves and goggles.
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Keep containers cool during process.
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Work slowly and carefully.
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After neutralization is complete, flush to sewer with 20 parts water.
Acid Neutralization: Use either a large Nalgene tub made of polyethylene or polycarbonate. Partially fill tub with cool water and sodium bi-carbonate. Leave water running into the sink or into the Nalgene tub.
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While stirring, add acids slowly to tub. When rapid reaction (bubbling) stops, stir to make sure all of the sodium bi-carbonate has reacted with the acid.
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If no sodium bi-carbonate is left in the tub, slowly add some more and stir until reaciotn stops. Also add sodium bi-carbonate to the area around the container in the hood sink.
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When a pH of at least 5.5 is achieved, dispose of the solution into the sewer, followed by 20 parts water. (Test with pH paper if necessary.)
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Be sure to wipe the area around the sink with a dampened sponge or lab wipe covered with sodium bi-carbonate to neutralize any spills. After ensuring that all spills are neutralized, thoroughly rinse the hood sink and the hood counter to remove any sodium bicarbonate.
Prepared by:
David J. Jones
Date: 9 July, 2001
