ICP MS 7900 Check Performace is failed

Hi Kathi,

could you paste a screenshot from the performance report, or tell us what exactly is "failing".

Are you using an Internal Standard? If so, which elements in which matrix?

Cheers

Chris

The Software flags the failing parameters in red. You are struggling with the oxide- or doubly charged ratio.

Click on "Select Data Display in History View" and add the "ratio".

Thank you so much! how can I improve the ratio?

A value this height reflects not the doubly charged Ce++ (70/140), but a „real“ signal in the Mass 70. 

Most likely is a contamination from HCl (Cl2), Ge or Zn which all have an isotope on 70.

maybe you are using an internal std, with the online addition kit (t-piece), if so just change the ISTD to water and rinse the system. 
if you are not using this, your tune solution is contaminated.

best of luck

Chris

A value this height reflects not the doubly charged Ce++ (70/140), but a „real“ signal in the Mass 70. 

Most likely is a contamination from HCl (Cl2), Ge or Zn which all have an isotope on 70.

maybe you are using an internal std, with the online addition kit (t-piece), if so just change the ISTD to water and rinse the system. 
if you are not using this, your tune solution is contaminated.

best of luck

Chris

Thanks! I have already replaced the Tune solution. I try rinsing with water. Are you from Germany?

Yes indeed I’m from Germany