Chemical composition and impurities Sample Clauses

Chemical composition and impurities. In NANoREG, there was only limited effort dedicated to thoroughly testing the quality of chemical analysis of MNM. Several different methods may be applied depending on the type of materials and impurities to be analyzed (Table 2). In D2.04, a strategy was proposed for identification and quantification of inorganic and organic coatings, which implies a bulk sample analysis of the inorganic elemental composition as well as combustion analysis to identify presence and amount of evaporable and combustible compounds. It is recommended that the elemental analysis is made using a technique that covers as much of the periodic table as possible (or at least the range of expected elements) and does not require extraction or dissolution. In addition, the method should be applicable to analyze both high and low concentrations ranging from ppm- range to 100 wt.%. If this is not possible complementary techniques should be applied. One should be aware that when the analysis requires extraction or dissolution, the quantification depends on the efficiency of extraction and dissolution and final recovery of the elements/compounds to analyze. For elemental analysis, a SOP for screening and quantification of the elemental composition using a standard-less WD-XRF method was applied. Presence and abundance of evaporable and combustible compounds can be assessed by either the water- loss and loss-on-ignition methods, which implies weighing of the mass-loss after heating a powder sample sufficiently to allow evaporation of adsorbed water and combustion of organic compounds associated with the powder, respectively. However, it is recommended to apply differential thermogravimetric analysis (TGA or DTA) combined with gas chromatography (GC) or Fourier Transform InfraRed spectroscopy (FTIR), which allows analysis of molecules released during combustion and temperature-resolved information on the mass- loss. Note in these analysis, the type of material should be considered as phase changes and decomposition of the main substance, such as carbonates and carbon nanotubes, should be understood.
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