Based on our experience with an original vintage
high resolution ICP-MS, two key things to consider are:
1.) Humidity. On humid days, we observed moisture
building up on the water cooled interface. This
affected the acceleration sourch and torch
and caused arc ing that would extinguish the torch.
2.) Magnetic fields. The acceleration of ions through
the ICP-MS was affected by magnetic fields in the
laboratory. Earlier instruments used a 4.5 KeV
accelerating voltage. I am told that new systems
use high accelerating voltages (~ 8 KeV). With
the higher voltage, local magnetic fields may not be
such a problem. If it is possible, check your laboratory
for magnetic fields prior to installation of the ICP-MS.
It is a good idea to check the field at various times
of the day. Magnetic field intensity may change
depending on what other equipment is in use.
Addtionally, with respect to plumbing and cooling systems, the
best arrangement is to have three water chillers:
one for the sample introduction system only, one
for the interface and another one for the rest of the
instrument. The set up allows you to vary the
temperature of the spray chamber independently
from the rest of the instrument.
Good luck with things!!!
Steven A. Koch
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