Frequent Questions

How do you interpret the mass calibration criteria for Inductively Coupled Plasma-Mass Spectrometry (ICP-MS) as described in SW-846 Method 6020A?

I’d like to know how to interpret the mass calibration criteria for ICP‐MS as described in Method 6020A:

If the mass calibration differs more than 0.1 amu from the true value, then the mass calibration must be adjusted to the correct value.

Does this mean ± 0.05 amu or ± 0.1 amu from the true value?

 

The method does not specify direction, but "differs more than 0.1 amu from the true value" means outside of 0.1 amu above or below the true value or ± 0.1 amu from the true value.

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