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Unformatted text preview: lating too many articles in the clean-up area. Usually, workspace around a sink is limited; piling up dirty
or cleaned glassware can lead to breakage. Remember that the turbid water in a sink
may hide the sharp, jagged edge of a piece of broken glassware that was intact when
put into the water. If glassware in the sink is broken, drain out the standing water.
Then use a pair of cut-resistant gloves, such as Kevlar or an equivalent, to remove the
pieces of broken glass. To minimize breakage of glassware, sink bottoms should have
rubber or plastic mats that do not block the drains.
Do not use strong cleaning agents such as nitric acid, chromic acid, sulfuric acid, or
other strong oxidizers unless specifically instructed to use them, and then only when
you wear proper protective equipment. Numerous accidents involving strong oxidizing cleaning solutions, such as chromic–sulfuric acid mixtures, have been reported.
Do not use flammable solvents as cleaning agents unless your instructor specifically
requires their use.
Inhaling Harmful Chemicals
Some people think that if they can smell a chemical, it is causing them harm. This
is not necessarily correct. It is certainly correct that if you smell a chemical, you are
inhaling it. However, some harmful chemicals have no odor; some paralyze the sense
of smell; some have an odor but cannot be detected by the human nose at concentrations that are harmful; and some chemicals, even though they might have a
decidedly noxious odor, are not harmful if inhaled. The long and short of it is simply
that the presence of an odor is not a reliable indication of potential harm, and the
absence of an odor is not a reliable indication of the absence of harm.
Many substances that may or may not have an odor are harmful if their vapors,
dust, or mist are inhaled. The label on the container and the Material Safety Data
Sheet for the chemical will carry a warning about inhaling, if appropriate (for a
detailed description, see “Material Safety Data Sheets” on page 12)....
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This document was uploaded on 02/27/2014 for the course PHYS 1B at UCSD.
- Spring '07