Counts going down ICP-MS 8900 during 2 hours test

Hi everyone.

We've been experiencing some trouble with our equipment, as detailed in:  Low sensitiviy and change in cps through time ICP-MS 8900 

We already polished and cleaned lenses, cleaned introduction system, and the sampling and skimer look alright. We also opened the vacuum chamber and closed it (without any further modifications).

Now remains a different but pre-existan problem The last 2 reports had decent sensitivity but CPS go down all the time. This are the results of a test indicated by Agilent:

Solution is 1 ppb tuning, and is being pumped all the time without an autosampler, like this:

Any ideas, suggestions? Is it a normal behaviour? I don't think so.


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