Why did we get so high darbly charged ratio (305.13% and 68.337%) for ICP-MS 7800?

Hi dear Di Xu,

As you understand you have elevated counts for mass 70, so the whole faction of double charged 70/140 is eleveted to the values reported. For this are two possible expanations:

1. When printing out the tune report you are adding an ISTD that contains Ge (germanium). Ge has an isotope of 70 and increasing the counts of this mass.

2. You are using ISIS3 and your Carrier/Rinse solution contains also HCl. When reaching the plasma this forms Cl2, which results to 35 x 2 = 70 elevated counts.

Hope I helped,

BR

Efstathios

Hi dear Di Xu,

As you understand you have elevated counts for mass 70, so the whole faction of double charged 70/140 is eleveted to the values reported. For this are two possible expanations:

1. When printing out the tune report you are adding an ISTD that contains Ge (germanium). Ge has an isotope of 70 and increasing the counts of this mass.

2. You are using ISIS3 and your Carrier/Rinse solution contains also HCl. When reaching the plasma this forms Cl2, which results to 35 x 2 = 70 elevated counts.

Hope I helped,

BR

Efstathios

Hi Efstathiois, 

Thank you for answering my questions. 

Your answer definitely helps us solve the problem. We ran the tune again without ISTD, everything is fine now. 

Best Regards, 

Di Xu

You are welcom Di Xu