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Abstract Details

An Analytical Technique of Trace Elements Using LA-ICP-MS for Tephra Identification

Kagami S, Yokoyama T & Umeda K

Kagami S, Yokoyama T & Umeda K (2020) Goldschmidt Abstracts, 2020 1233

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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.

Submitted by Yuri Amelin on
You mentioned that ICP-AES is an established method for chemical analysis of tephras, but only for bulk samples. Can you use ICP-AES in combination with laser ablation? If not, what prevents it (e.g. insufficient sensitivity)? If yes, how would it compare with LA-ICP-MS for the elements where the concentrations of elements are high enough for both methods?
Thank you, Amelin. In some case, ICP-AES is used with LA system. However, in our laboratory, an ICP-AES and an LA system are in separate room, so we have not tried the LA-ICP-AES analysis. Some previous studies used LA-ICP-AES for major elements, and performed in-situ analyses. However, detection limit by LA-ICP-MS is lower than that by LA-ICP-AES, and then I think the LA-ICP-MS method is suitable for trace elements. Especially, abundances of heavy REEs in some tephra glasses are nearly equal to quantitative limit by LA-ICP-MS. About your question of “How would LA-ICP-AES compare with LA-ICP-MS for the elements where the concentrations of elements are high enough for both methods”, I don’t know which methods we should use. Major elements are interfered by many isobars, so ICP-AES may be suitable for them compared with ICP-MS. On the other hand, easily ionized elements such as alkaline elements are not suitable for LA-ICP-AES analysis. In our laboratory, we analyze major elements by EPMA before trace elements analysis by LA-ICP-MS. If possible, I will try to use both of LA-ICP-AES and LA-ICP-MS by splitting sample gas flow and then we could obtain major and trace element compositions from the same position.

Submitted by Bryant Ware on
Very interesting additional tephra characterization technique than the traditional physical observation approaches. What would be the ultimate goal and outcome of a geochemical tephra catalogue?
Thank you, Bryant. The ultimate goal is to categorize wide-spread tephras by physical observation and our analytical method. We can date a bed including tephras by the tephra catalogue, even if we cannot apply carbon-14 method for dating.

Submitted by Saya Kagami on
Thank you, Bryant. The ultimate goal is to categorize wide-spread tephras by physical observation and our analytical method. We can date a bed including tephras by the tephra catalogue, even if we cannot apply carbon-14 method for dating.


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