ICP-MS 7900 Tune UHMI with ISIS3 (Signal and RSD)


I would like to verify what concentration should my tune solution be if I am running HMI-4 on our ICP-MS 7900. The instrument is configured with 1.02 mm tubing for carrier and 0.25 mm orange, blue for carrier. I tuned with a 16ppb solution, but the RSD are higher, and signal counts are lower for mass 59,89,205 then running without aerosol dilution. 

I would greatly appreciate it my question could be answer.

Thank You, 

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