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. 2023 May 18:1–16. Online ahead of print. doi: 10.1007/s10967-023-08928-y

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© Akadémiai Kiadó, Budapest, Hungary 2023, Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.

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Fig. 5 — Undissolved solids formed during the sample digestion of (a) Alloy-1 and (b) Alloy-2. These photographs were taken after adding HNO₃ but before adding any HF. The solids were at first gray in color, but eventually turned white after several hours of refluxing (see Fig. 10 and [30])