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Safety Practices and Hazards
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9
10 Aspirating solutions (especially alkaline/ammoniacal ones) that
Furnace and Zeeman Operation
Gases
The graphite tube atomizer gas supply system is designed for use
with inert gases and air.
Never use pure hydrogen with the graphite tube atomizer since this
could result in leakage and potentially explosive accumulation of
hydrogen. You may, however, use a proprietary, prepackaged mixture
of 95% argon (or nitrogen) and 5% hydrogen. Never attempt to create
your own mixture of hydrogen and an inert gas for use with the GTA
system.
Heat Hazards
A hot furnace atomizer can present heat hazards that can result in
severe burns to personnel. Never put your hands in the sample
compartment while you are operating your furnace.
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As free acetylene is unstable at elevated pressure, it has to be
stored in the cylinder by dissolving it in acetone.
If the gas is withdrawn too quickly, or the cylinder pressure is
allowed to drop below 700 kPa, acetone may be drawn off in
sufficient quantities to affect analytical performance, damage
seals, O-rings and hoses, or even cause a flashback. Observe the
recommendations concerning the use of acetylene.
Where possible, you should not perform digests with perchloric
acid. As this acid is well known for forming unstable salts,
operators using this acid should ensure that the minimum
amount is allowed to reach the spectrometer, and that the
burner, spray chamber and liquid trap are thoroughly cleaned
after each analysis to ensure that unstable salts are not allowed
to build up. Failure to do this can result in unpredictable
flashbacks.
contain high concentrations of Ag and Cu can lead to the
formation of acetylides which can spontaneously decompose and
cause a flashback.
Agilent 240/280 Series AA User's Guide
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