Mechanical size reduction of solids inevitably results in wear of the grinding tools, the so-called abrasion. This means that during grinding, for example with grinding tools made of steel, a certain amount of steel components as well as heavy metals, chromium, etc., can be introduced into the sample. Generally, abrasion is in the ppm or ppb range.
Nevertheless, the grinding process should be carried out as contamination-free as possible. For example, in the case of subsequent analysis for heavy metals, it is advisable to select breaking jaws made of a material that has as few or no heavy metals as possible. Abrasion resistance also plays a role, which varies depending on the material.
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