I too have an iCAP-Q. Just for grins, what is your CCT RF Amplitude Offset (Virtual CCT Mass to Dac Offset) set to?
Associate Consultant Chemist, Global Quality Labs (GQL)
Eli Lilly and Company
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From: PLASMACHEM-L: Analytical Chem.(ICP's, DCP's, MIP's). <[log in to unmask]> On Behalf Of Prasad Lavisetty
Sent: Tuesday, June 26, 2018 9:10 PM
To: [log in to unmask]
Subject: [EXTERNAL] High Background at 4.5 and 220 mass
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.