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| MC-ICP-MS | |
|---|---|
| Name | Multicollector inductively coupled plasma mass spectrometer |
| Invented | 1990s |
| Inventors | Fritz K. H. Krantz? |
| Developers | Thermo Fisher Scientific, Nu Instruments, Agilent Technologies |
| Used for | High-precision isotope ratio measurements |
| Manufacturers | Thermo Fisher Scientific, Nu Instruments, Agilent Technologies |
MC-ICP-MS
Multicollector inductively coupled plasma mass spectrometry is a high-precision isotope ratio technique widely used in geochemistry, cosmochemistry, forensic science, nuclear forensics, environmental science, archaeology, oceanography, and planetary science. Instruments combine an inductively coupled plasma source with a multicollector mass analyzer to permit simultaneous detection of multiple isotopes, enabling studies ranging from radiogenic chronometers in Greenland ice to tracing provenance in Roman artefacts and assessing fallout from Chernobyl and Fukushima incidents. Major adopters include research centers at Massachusetts Institute of Technology, University of Cambridge, Smithsonian Institution, Scripps Institution of Oceanography, and national laboratories such as Lawrence Berkeley National Laboratory and Oak Ridge National Laboratory.
The core components mirror those in many high-end mass spectrometers: a sample introduction system coupled to an inductively coupled plasma torch, an ion optics region feeding a magnetic/electrostatic mass analyzer, and an array of collectors—usually Faraday cups or secondary electron multipliers—arranged to record isotopic beams simultaneously. Ionization in the plasma follows principles established in Eddy currents-driven torches and borrows RF technology developed in the 1960s for analytical plasma sources. Mass separation relies on sector-field magnets and electrostatic analyzers with stability innovations influenced by companies like Thermo Fisher Scientific and instruments used at facilities such as Max Planck Society laboratories. Collectors enable simultaneous counting akin to techniques refined in Ernest Rutherford-era mass spectrometry but adapted for modern trace-level work.
Sample handling protocols draw on trace-metal clean labs at institutions like Scripps Institution of Oceanography and Woods Hole Oceanographic Institution to avoid contamination from laboratory-grade reagents produced by firms such as Sigma-Aldrich. Chemical separation methods employ ion-exchange chromatography inspired by procedures from Alfred Nobel-era separations and refined through practices at Carnegie Institution for Science. Introduction pathways include nebulization with desolvation systems used in PerkinElmer instrumentation, microflow nebulizers developed in collaboration with Agilent Technologies, and laser ablation interfaces pioneered in collaborations involving University of California, Los Angeles and CNRS. Sample matrices from Lunar Reconnaissance Orbiter returned analogs to anthropogenic aerosols collected near Three Mile Island require matrix-matching and column chemistry adapted from radiochemical protocols at Lawrence Livermore National Laboratory.
MC-ICP-MS supports a spectrum of isotope systems: radiogenic chronometers such as U–Pb for zircons from Jack Hills and Pb–Pb for meteorites studied at Smithsonian Institution; stable isotopes including Sr for provenance traced in Viking-era materials; non-traditional stable systems like Fe and Mo used in Paleoceanography reconstructions led by groups at Columbia University and University of Oxford; and actinide work critical to International Atomic Energy Agency mandates for nuclear safeguards. Applications extend to paleoenvironmental records such as seawater reconstructions produced by teams at Scripps Institution of Oceanography and provenance studies on Shakespeare-era artifacts archived at the British Museum.
Data workflows integrate raw signal corrections for mass bias, detector dead time, and baseline using software platforms developed by manufacturers and adopted in laboratories at ETH Zurich and National Institute of Standards and Technology. Calibration strategies employ double-spike techniques improved through research at University of Potsdam and standard bracketing using certified reference materials from International Atomic Energy Agency and National Institute of Standards and Technology. Quality control leverages interlaboratory comparisons such as those coordinated by International Union of Geodesy and Geophysics working groups and proficiency testing run by United Nations Scientific Committee on the Effects of Atomic Radiation.
Key challenges include isobaric interferences from polyatomic species produced in the inductively coupled plasma (e.g., Ar-based polyatomics), molecular formation, and mass bias arising from differential transmission. Matrix effects are notorious when analyzing samples with high salt content from campaigns led by NOAA or complex organometallic ligands studied at MIT. Detector nonlinearity and Faraday cup resistor drift require routine checks following protocols from Oak Ridge National Laboratory and Los Alamos National Laboratory. Radiogenic isotope work faces additional complications from common-Pb correction strategies debated in literature emerging from University of California, Berkeley and Harvard University.
Recent progress includes coupling laser ablation with MC-ICP-MS for high spatial resolution studies pursued by teams at University of Arizona and University of Melbourne, development of collision/reaction cell approaches inspired by European Organization for Nuclear Research concepts to mitigate polyatomic interferences, and integration with microfluidic separation devices tested at California Institute of Technology. Novel detector arrays and high-resolving power mass analyzers are being prototyped in collaborations with Max Planck Society and industry partners such as Nu Instruments. Cross-disciplinary applications expand through projects funded by agencies like National Science Foundation and European Research Council focusing on planetary science sample-return efforts and forensic provenance networks coordinated by INTERPOL.