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Elemental Analysis of Individual Nanograins in Meteorites by ICP-TOF-MS
Nakazato M, Yamashita S & Hirata T
Nakazato M, Yamashita S & Hirata T (2020) Goldschmidt Abstracts, 2020 1886
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06n: Room 2, View in program
Listed below are questions that have been submitted by the community that the author will try and cover in their presentation. To submit a question, ensure you are signed in to the website. Authors or session conveners approve questions before they are displayed here.
What isotopes can be analysed on these samples using ICPTOFMS and what kind of precision (roughly) do you think can be achieved?
Thank you for the question! We can measure any isotopes with m/z between 18 to 256 from single grain by ICP-TOF-MS. The precision depends on the Poisson counting statistics, and about 10% of uncertainties may remain for the measurement of 100 nm grains by ICP-TOF-MS. (additional info. to the Q&A session) Interference of polyatomic ions are reduced by applying collision/reaction gas. Mass resolution achieved by Time-of-Flight mass separation is about 3000, and further pseudo-high resolution is also available.
How do you achieve high throughput of >100 grains per minute while collecting the ablated material in water? Do you have some kind of automated system for handling liquid samples?
Thank you for the question! We prepare samples by LAL technique before measurements by ICP-TOF-MS. As the result of the sample preparation, we obtain a liquid dispersion of nano-sized grains collected from meteorites (roughly 10,000 grains/mL). For the measurements, we can introduce the liquid dispersion through the liquid nebulization system. This enables the high throughput of grains constantly. At this moment, each procedure is not automated, unfortunately. (additional info. to the Q&A session) About 0.03 mL/min of the sample dispersion is introduced into ICP, and about 40% of grains within it are detectable. Therefore, if the sample contained 10,000 grains/mL, detection of 120 grains/min are theoretically expected.
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