We have Thermo IcapQ ICPMS, recently we are facing problems with high background at mass 4.5 and 220. The performance at both standard and KED modes are failing in background (both mass 4.5 and 220). I cleaned the cones, nebulizer and spray chamber. I didn't touch the torch and lens. Still the performance is not meeting criteria. Can anybody suggest to solve this problem.
Any suggestions greatly appreciated.
Scientist, Teva pharmaceuticals, Inc.