The measurement ROHS of Cr, Hg, Pb, Br and Cd in polyethylene (PE) by XRF rapid screening XRF

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). 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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