The preparation of a final sample received in the laboratory consists of a series of operations, generally sieving, grinding and homogenization, carried out in such a way as to obtain that: - on the one hand, the smallest weight set by the analysis methods is representative of the final sample, - on the other hand, the fineness of the sample cannot have been modified by the preparation to the point of significantly altering the various solubilities in the different reagents used for extraction.

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