Hello all,
I believe I am missing a mechanism here with my Varian AAS flame assayer which is refusing to aspirate samples.
Things I did:
1. swapped out my plastic capillary tube.
2. Pulled apart the nebulizer and confirmed that I could push a thin wire all the way through
to the glass bead
3. Made sure to adjust the flow rate valve (the adjuster next to the capillary input) to make sure it wasn't closing off flow into the burner
Other:
1. Flame works fine
2. The water trap had been neglected to be cleaned for several months through the pandemic.
3. No parts were replaced inside the nebulizer
Given there are no obvious blockages into and through the nebulizer and adjustment of the flowrate valve to make sure the glass bead isn't inhibiting the flow has me at an impasse on what the problem may be. Any guidance is heavily appreciated.
Thank you!
Hi! Check a different set of nebulizer and capillary tube on your spectrometer, and if the nebulizer still does not suck, check both sets on a different spectrometer.
ZJ
How old is your aspiration system? After 15 years of intense usage, we had to change the nebulizer port of our oldest instrument. Although we didn't have problems of no aspiration, the signal would never stabilize before the exchange.
Anyway, you should try standards that would have high absorbance, check your emission lamps and check the wavelength calibration of your monochromator - if the latter is not ok, you would see no absorbance at all.
First check the block etc, and then check the position and tidiness (2 screws are in the side)
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