Question on ICP-MS analysis on Zn

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Matt W
Matt W's picture
Question on ICP-MS analysis on Zn

Hi everyone,          I had an issue on Zn analysis that I really don't understand (we use ELAN 6100), my calibration curve between 10 ppb and 50 ppb is ok (R2 = 0.999), however, my blank intensity (9,000 cps) is much lower than the intercept of that calibration curve (37,000 cps). I used Zn64, 66, and 68 to determine Zn concentration in case of possible interference on Zn64, however, this conclusion applies on all of them.        I know my calibration standard is not comtaminated by other elements such as As, Fe, Cd, Mn, Pb and so on from my previous analysis, so, I'm wondering does anyone has an idea on it? Thank you very much!