Each analytical method reports its results with an error value, typically 2-sigma (95% confidence); have the errors associated with each measurement been considered when evaluating the results?
• Labs typically perform ICP analysis as stated in ASTM F963-08 or EN71-3. This analysis method determines the leachable (soluble) fraction of Pb, which does not correlate to an XRF analyzer’s total Pb analysis data. • The lab is using an incorrect test method (contact us for a copy of Appropriate Test Methods; also available to our customers at https://thermofiles/thermofisher.com/pea) • There may be issues with substrate dilution. (It can be difficult to remove a single layer of paint without including some of the substrate. This effectively dilutes the sample.) For more information on this subject, please read our whitepaper entitled “Screening Consumer Products for Toxic Substances – X-ray Fluorescence and Reducing Compliance Risk” • The results may not be reported in the same units. (ppm is not the same as μg/cm2) • Your Niton XL3t XRF analyzer may be in an incorrect analytical mode.
Related Questions
- Each analytical method reports its results with an error value, typically 2-sigma (95% confidence); have the errors associated with each measurement been considered when evaluating the results?
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