Page 34 - Solutions for Plastic Evaluation

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Product Evaluation
Analysis of Hazardous Elements
EDX

Evaluation of Plastic Materials Analysis of Hazardous Elements in Plastic Using an EDX Spectrometer
Due to its ability to quickly, easily, and non-destructively analyze solids, powders, and liquids, X-ray fluorescence spectrometers have been
widely used for screening the five elements (Cd, Pb, Hg, Cr, and Br) regulated under the RoHS and ELV directives. This example measures
hazardous elements in the insulating jacket material of a LAN cable. Specifically, it shows results from analyzing Pb and Cd.

Evaluation of Raw Materials

Quantitation Results
LAN Cable Using an EDX System
Pb: 7600 ppm
Cd: 52 ppm
Product Evaluation EDX-720 Spectra for Pb (Left) and Cd (Right) Analytical Conditions

Instrument: EDX-720
A calibration curve was created and quantitative analysis performed using standard samples
prepared by adding the five RoHS elements (Cd, Pb, Hg, Cr, and Br) to PE and PVC plastic. Tube voltage: 50 kV
Tube current: Automatic
Measurement time: 100 sec
Product Information EDX series models are equipped standard with a primary filter that is optimal for hazardous
Features of the EDX Series
Optimal filter used
elements, which allows measuring the five RoHS elements easily and with high sensitivity.
In addition, a background internal standard correction function is included to correct for
the thickness, shape, and size of samples. Background internal standard correction corrects
quantitation values based on the ratio between continuous X-rays from the X-ray tube or
characteristic X-rays from the target and scattered rays.

Automatic Calibration Curve Selection Function
When analyzing X-ray fluorescence, different sample types (PE versus PVC, for example) cause the X-ray fluorescence intensity to vary. The
automatic calibration curve selection function allows using the software to determine the presence of Cl, automatically select the optimal
calibration curve for PE or PVC, and then quantitate the content.

Measured Intensity (cps/uA)

Standard Value (ppm)

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