RoHS/WEEE Element Cadmium

Cadmium (Cd)

Cadmium (Cd) can be absorbed easily by organisms and ecosystems, will accumulate over time, and is considered toxic and carcinogenic. The 2002/95/EC Directive limits the maximum level of Cd at 100ppm.

Options for Testing and Measuring
XRF analyzers can be used as a quick, non destructive test method to ensure Cd free components.

• The NITON XLt field portable XRF can be used anywhere in your facility to quickly screen Cd levels
• The ARL QUANT'X is a robust laboratory XRF analyzer appropriate for any high throughput laboratory.
• The Thermo Scientific Micro XR is a sophisticated small spot XRF instrument which can be used to pinpoint sample measurement.

For low level measurement, more sensitive techniques are required, specifically AAS or ICP-OES. Either method yields precise results at the required RoHS limit levels; both require some sample preparation by digesting the sample prior to analysis to ensure homogeneity.

• Either the M or S series AAS instruments can be used to detect levels down to low ppm or ppb levels.
• The iCAP 6000 series ICP can be used for multiple element measurement, including Cd, with accuracy down to 1ppb.

Where is it used
Cadmium is used primarily in Cd-Ni batteries, but can also be electroplating applications as well as in pigment that can be added for coloring and/or stabilizers in plastics which are heat resistant. Other uses include solder and electroplating, as well as industrial lubricants.