SPECIFIC
PROCEDURES FOR TOXIC MATERIALS
The MSDS's for many of the chemicals used in the laboratory
will state recommended limits or OSHA mandated limits, or both, as
guidelines for exposure. Typical limits are threshold limit values
(TLV), permissible exposure limits (PEL), and action levels. When
such limits are stated, they will be used to assist the chemical hygiene
officer and laboratory supervisor in determining the safety precautions,
control measures, and safety apparel that apply when working with
toxic chemicals. In addition to the general rules that follow, there
is a group of chemicals (a complete list is available in the stockroom)
that mandate specific requirements for handling and use. Acrylamide,
formaldehyde, benzene, and chloroform are on this list and anyone
in the Science Center using these materials must read and comply with
these SOP's.
Procedures for Toxic Materials
- All volatile toxic chemicals should be used in an operating fume
hood, glove box, vacuum line, or similar device, which is equipped
with appropriate traps. If none are available no work should be
performed using that chemical.
Procedures for Flammable Chemicals
- Flammable substances should be handled only in areas free of ignition
sources.
- Flammable substances should never be heated by using an open flame.
Preferred heat sources include steambaths, water baths, oil baths,
and heating mantles.
- Ventilation is one of the most effective ways to prevent the formation
of flammable mixtures. An exhaust hood should be used whenever appreciable
quantities of flammable substances are to stand in open containers,
heated in the opened containers, or handled in any way.
Procedures for Reactive Chemicals
Reactive chemicals must be segregated in storage and should be
handled observing all proper safety precautions. Students who plan
to mix reactive chemicals with other chemicals (even small quantities)
should obtain the prior approval of the lab instructor and wear
appropriate personal protection.
Procedures for Corrosive Chemicals
When working with significant quantities of corrosive chemicals,
use all proper safety precautions. Wear both safety goggles and
faceshields, gloves which have been tested for absence of pin penetration,
and a laboratory apron or laboratory coat.
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