Ag Calibration Curve on ICP-MS 7900

Hello everyone, 

I am having trouble to get a good calibration curve just for Ag. 

my standards are 0, 25 ppb, 50 ppb, 75 ppb, 100 ppb and 400ppb. And the matrix is 2% HNO3. 

All the other elements are good I get R=0.9999 but for Ag it is terrible. I have R=0.1123 like this. And I am not sure what to do! 

Thank you for your help 

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