Hello Chemical Forum Members,
I am having an issue with liquid reaching the plasma from the spray chamber. Here are some of the instrument specs:
ICP-OES: Perkin Elmer Optima 7300 DV
Spray Chamber: CPI, Cyclonic, No Baffle, P/N 4060-010790
Plasma: 15 L/min.
Aux.: 0.6 L/min.
Nebulizer: 0.57 L/min.
RF Power: 1500W
Pump: 1.80 mL/min.
Note: We have been using this instrument at these specs for over 5 years. We are analyzing metals in water and soil matrices. The problem below recently started a few months ago.
When using a new CPI spray chamber liquid beads on the cyclonic area of the spray chamber, filling it with a cloudy mist, and it also beads on the end that connects to the injector. I have tried adding aqua regia to the spray chamber for a period of 24 hrs and I have noticed less beading in the cyclonic area but it has not kept liquid droplets from reaching the injector and eventually the plasma.
I have also tried an older used Perkin Elmer cyclonic spray chamber and there is no beading on the cyclonic area but there is a build of liquid on the end that connects to the injector.
I have also replaced every part in the sample introduction and liquid continues to bead on the spray chamber.
Any Ideas? Thank you.