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5
Figure 36. Impact bead adjustment screw
TIP
You can find the optimum bead position for most applications by aspirating a
5 mg/L solution of copper.
The system is now optimized. You can now take readings, measure your
calibration standards, or perform a reslope as described in the following sections.
Nebulizer setup
This section assumes you have correctly assembled the nebulizer and installed
the nebulizer/spray chamber assembly in the sample compartment.
The nebulizer is fully adjustable, allowing you to change the position of the internal
capillary to vary the uptake rate from 0 to 8 mL/min, compensating for the fueling
effect of organic solvents.
The setting of the thimble determines how close the impact bead is to the outlet of
the capillary tube. This enables the optimal nebulizer setting based on the
characteristics of your samples.
Agilent 55B AA Spectrometer User's Guide
general, once optimized for maximum sensitivity, this position can be used for
all analyses.
Adjust the impact bead position by gradually turning the impact bead
adjustment screw first clockwise, then counter-clockwise to find the
maximum absorbance.
Operation
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