PlasmaQuant MS Series
Sample
Introduction
29
4.5.1
Cleaning the Torch
During normal operation, deposits may form on the torch that may interfere with the
operation of the instrument. Regular cleaning of the torch is required to avoid possible
problems. The cleaning requirements for the torch will vary, depending on the type of
sample matrix run and the frequency of cleaning.
Figure 4-7 - Plasma Torch Compartment
1.
See section 6.5.4, page 70 for instruction the removal and replacement of the
torch.
2.
Soak the torch in 10% HNO
3
overnight to dissolve simple surface deposits.
NOTE
For stubborn deposits and stains, soak the torch overnight in aqua regia (1:3
solution of hydrochloric acid (HCl) and HNO
3
).
WARNING
Nitric (HNO
3
), hydrochloric (HCl) acids and aqua regia are all very corrosive and can
cause severe burns if they come in contact with the skin. Always wear appropriate
protective clothing when handling these acids. If these acids are required, your
customer must perform the cleaning of the torch.
3.
Once the torch is clean, rinse it under de-ionized water.
4.
Dry the torch with argon or nitrogen.
NOTICE
Always verify that the torch is completely dry before replacing it in the instrument.
Moisture remaining in the torch may cause difficulties during plasma ignition.