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Total reflection X-ray fluorescence spectroscopy (TXRF) might complement IR and Raman spectroscopy. Spectroscopy, together with infrared (IR), Raman, 2D-fluorescence, and complete reflection X-ray fluorescence combined with multivariate information analysis, are often thought of. When more intensive fingerprinting or investigative work is required, several strategies could also be helpful, together with chromatography or inductively coupled plasma mass spectrometry (ICP-MS). High- or extremely-high-performance liquid chromatography is commonly us