RoHS Rapid Screening by FP

AppNote 1265: the measurement of Cr, Hg, Pb, Br and Cd in polyethylene (PE) by XRF rapid screening using the Fundamental Parameters method (FP) is discussed.

Background

The Restriction on Hazardous Substances (RoHS) initiative has been in effect for several years and regulates the maximum allowable levels of Cr, Hg, Pb, Br, Cd and Cl in consumer goods, particularly in plastics and polymers. XRF is used in the RoHS and similar protocols as a tool for rapid screening to quickly determine the presence of hazardous materials, mainly the elements Cr, Hg, Pb, Br and Cd. (Cl is also included in the regulated elements; see also Rigaku Application Note #1169). In the rapid screening protocols, tight accuracy is not required by the XRF screening tool. A typical screening scheme is given here for rapid screening by XRF given maximum allowable limits of 1000 ppm each for Cr, Hg, Pb and Br and 100 ppm for Cd. When a result falls within the Inconclusive range, the sample is then measured by ICP to confirm the elemental concentrations.

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