Optical Emission Spectrometry - Inductively Coupled Plasma

optical emission spectrometry

When argon gas is passed through a micro wave RF coil and excitation is initiated with a high voltage spark the argon ionizes and produces a plasma state which is at a temperature of 6000°C to 10,000°C. On addition of aqueous or organic solutions or suspension of metals or non metals to the argon plasma, excitation of the elements will occur resulting in emission of specific wave lengths of electromagnetic radiation. The intensity of radiation is proportional to the concentration of the element in the solution. Each element emits at multiple wavelengths. These wavelengths are separated by a diffraction grating and sent to photo multiplier tubes. With appropriate amplifiers, A to D converters, computers and software a powerful analytical instrument is then at the disposal of experienced analytical chemists. The main advantage of ICP Optical Emission Spectrometry is the linear dynamic concentration of the analysis from ppb levels to high ppm levels and the ability to analyze for multiple elements simultaneously.

Applications of ICP Optical Emission Spectrometry in the plastics and polymer industries:

  1. RoHS and WEEE testing of plastics for acceptable levels of cadmium, mercury, chromium, lead, brominated biphenyls and brominated diphenyl ether.
  2. BS EN71 testing for antimony, arsenic, barium, cadmium, chromium, lead, mercury and selenium.
  3. US Consumer Product Safety Commission Testing
  4. Toxics in Packaging legislation.
  5. Determination of catalyst levels in plastics.
  6. ASTM F 963 testing.
  7. Title 16 CFR 1303.
  8. Identification of plastic manufacturers from their markers.
  9. Green procurement.
  10. Contamination issues in plastics.

For more information, contact Polyhedron Lab today!