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