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Fusion is a technique used to prepare inorganic samples, with a view to analyze them by x-ray fluorescence (XRF), inductively coupled plasma (ICP), atomic absorption (AA) or any traditional wet chemistry method. A fusion can produce either a small, homogenous glass disk (or "bead") for XRF, or an acid solution for other analytical methods. The process of fusion as a sample preparation method exhibits many advantages over other methods, as it does not produce mineralogical, grain size or orientation effects and the result is perfectly homogenous. Fusion is also capable of preparing samples that are very refractory, and otherwise hard to digest.
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