4 Maintaining the MSD
99
Chemical residue is another potential danger
Only a small portion of your sample is ionized by the ion source. The
majority of any sample passes through the ion source without being ionized.
It is pumped away by the vacuum system. As a result, the exhaust from the
foreline pump will contain traces of the carrier gas and your samples. It will
also contain tiny droplets of foreline pump oil.
An oil trap is supplied with the foreline pump. This trap stops
only pump
oil droplets. It
does not trap any other chemicals. If you are using toxic
solvents or analyzing toxic chemicals, do not use the oil trap. Instead, install
a hose to take the exhaust from the foreline pump outdoors or into a fume
hood vented to the outdoors. Be sure to comply with your local air quality
regulations.
The fluids in the diffusion pump and foreline pump also collect traces of the
samples being analyzed. All used pump fluid should be considered hazard-
ous and handled accordingly. Dispose of used fluid correctly, as specified
by your local regulations.
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