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Chemical SOP - Acid Neutralization
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
Last Update:
2006-09-21
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