李中平
TIMS and MC-ICP-MS
2024-4-19 18:06
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 TIMS (Thermal Ionization Mass Spectrometry) and MC-ICP-MS (Multiple Collector Inductively Coupled Plasma Mass Spectrometry):

ParameterThermal Ionization Mass Spectrometry (TIMS)Multiple Collector Inductively Coupled Plasma Mass Spectrometry (MC-ICP-MS)
PrincipleHeating samples to ionize elements, typically using a filament or resistive filmIonization of elements by a high-temperature plasma generated by an inductively coupled plasma torch
Main ApplicationPrecise radiometric dating (e.g., U-Pb, Rb-Sr, Sm-Nd) and high-precision stable isotope analysisRapid and high-throughput stable isotope ratio analysis, particularly for trace elements
Spatial ResolutionLimited, generally not suitable for micro-samplingCan be coupled with LA (Laser Ablation) for micro-spatial analysis (LA-MC-ICP-MS)
Elemental RangeLimited to specific elements that form volatile oxides or chloridesWider range, applicable to a larger number of elements
SensitivityExceptionally high for certain elements due to longer counting timesGood sensitivity for trace elements, though generally lower than TIMS
Analysis TimeLonger, typically suited for fewer samples with high precision demandsShorter, allowing for high sample throughput and rapid results
Matrix EffectsMore pronounced due to direct sample loadingLess sensitive to matrix effects but still influenced by them
Sample PreparationRequires chemical separation and loading onto filaments or targetsGenerally less complex, can handle solutions and solids directly
Typical PrecisionOutstanding for long-lived radioactive isotopes and select stable isotopesExcellent for many stable isotopes, though depends on instrument configuration
Cost Per AnalysisHigher due to specialized consumables and longer run timesLower for routine analyses, but initial instrument cost can be higher
Sample ConsumptionRelatively high, particularly for isotopic dating methodsLow, suited for small samples or precious materials

Note: This table summarizes general information, and specific details might vary depending on the instrument model, configuration, and the laboratory setup.

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