Operation
Agilent 55B AA Spectrometer User’s Guide 85
Figure 39. Nitrous oxide/Acetylene flames. Left to right – Lean, Stoichiometric, Rich
Performance checks
Check the performance of your nebulizer:
At installation.
Weekly.
When using a new type of solution.
After the nebulizer has been pulled apart and re-assembled.
To check the performance of your nebulizer:
1 Ensure the nebulizer is correctly installed and set up. Set the nebulizer to high
vacuum mode as per ‘High vacuum setting’ on Page 82, or if you are using
organics, set the nebulizer to maximum uptake rate (thimble fully clockwise).
2 Prepare an aqueous solution of copper with a concentration of 5 mg/mL.
3 Set the instrument up to measure the absorbance of copper in an air-
acetylene flame.
4 With the system fully optimized as described in ‘Optimization’ on Page 74,
aspirate distilled water from a 10 mL calibrated cylinder for a carefully timed
period and calculate the uptake rate. This should be between 3 and 6.5
mL/min for a High Vacuum setting.
5 Zero the instrument (press the Alt and Read keys together).
6 Aspirate a solution of 5 mg/mL copper and note the absorbance reading.
Agilent guarantee an absorbance of 0.75 or better using the Mark 7 flame
atomization system under fully optimized conditions.
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