Getting Started
28 Agilent Graphite Tube Atomizer GTA 120 User’s Guide
TIP
Although more expensive, argon will generally give better analytical sensitivity
and longer tube life than nitrogen during the ‘Read’ stage. However it is possible
to use nitrogen during the drying/ashing stages and argon during the
ashing/atomization stage. This will reduce gas use costs.
If you are not using an alternate gas, you should cover the inlet to protect against
dust, moisture etc. If you use air, make sure that your furnace method is in
accordance with the limitations on the use of air.
NOTE
If air ashing is employed, the flow should be high enough to remove ashing
products and generally assist the ashing process. Do not use air at graphite tube
temperatures above 250 °C, as this will cause excessive deterioration of the
graphite furnace tube.
All gases must be clean, dry and of high purity.
WARNING
Fire and Explosion Hazard
To avoid a fire or explosion which could result in death or serious personal
injury, burns or property damage, NEVER use pure hydrogen (or any gas with
a hydrogen content greater than 5%) in the GTA. You may use a proprietary,
pre-packaged mixture of 95% argon and 5% hydrogen as an alternate gas.
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