Measurement and Results - Relative precision in ICP-MS standards
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Achieving a precision of approximately 0.1% relative is difficult, and one primary reason is that the NIST standards that form the basis for determining the final certified values typically have relative uncertainties of approximately 0.2%; additional terms in the error budget such as weighing/dilution errors, instrument/method precision, etc., tend to increase the overall uncertainty (precision) associated with the final certified value. The best approach we can offer is to use those certified Ca and P starting materials in our inventory that have the lowest uncertainties to manufacture the requested standards. We can provide estimates of what the resulting uncertainties may be, but expect them to be in the range of 0.4 – 0.6% relative, perhaps slightly lower. |