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What does liberation size mean when a particulate sample is ground?

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Viking 1 on Mars — sample preparation Viking 1's sample scoop, poised to extract material from the surface of Mars.

In the context of analytical chemistry, when a particulate sample is ground, the liberation size refers to the specific particle diameter at which the analyte can be considered a pointlike component of the entire laboratory sample.1

This process is necessary when an analyte is associated with one or more constituents of a material. By grinding the sample to reduce its average particle size to this threshold, the analyte becomes effectively distributed throughout the material, ensuring that subsequent test portions are representative. The liberation size is not a universal value; it varies depending on the specific analyte and the nature of the material being processed.1

Achieving this state is a critical step in sample preparation, as it allows for accurate determination of the analyte within the test sample.1