Agilent 7500a ICP-MS
(Inductively Coupled Plasma - Mass Spectrometer)
Our ICP-MS is located in a class 100 clean room for trace element analysis of water, soil, sediment, rocks/minerals, tissues, etc.
Typical detection limits are in the ppt range for most metals and low ppb range for non-metals such as P and S.
Liquid samples (typically aquous samples stabilized in nitric acid) are taken up automatically from pre programmed autosampler positions. A nebulizer is used to aspirate samples into a fine mist, and a peltier chilled double pass spray chamber is used to remove large drops and reduce the water vapor content of the aerosol. The aerosol is then injected into the argon plasma at ~8000K (14,000 ºF) where it is decomposed and ionized. Positively charged ions are then injected in the mass spectrometer, focused, and sorted by their mass to charge ratio (m/z) before being counted by an electron multiplier (pulse counting detector).
1, 2, 4. Nebulizer, Spray Chamber, Peristaltic Pump, and Torch Box
4, 5. Torch Box and Interface (Sampler Cone)
4, 5. Torch Box and Interface (Skimmer Cone)
Inductively Coupled Plasma - ICP (Temp ~8000K)
6-9. Lenses, quadrupole assembly, and detector (L-R) within the vacuum chamber
6. Close up of Einzel and Omega lense assembly. The quadrupole is as the bottom of this image, and the interface region is at the very top.