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In order to make representative sampling, a huge number of samples are needed or extremely big samples compared with the size of the population (as an example: Cr-content of the bike). Only then the composition of waste can be defined. If it is not possible to make continuous measurements, it is better to do bigger sampling testing only on what is a matter of interest. Finally, it is important to take into account by whom, how often and where the samples are taken, which is also necessary in the sampling of waste, in order to be certified by all regulations.

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