in-laboratory processing

in analytical chemistry
https://doi.org/10.1351/goldbook.I03045
The selection, removal and preparation of the test (or analytical) portions from the @L03433@. The processing may include a reduction in the size of the unit(s) (division) and particle size (reduction), as well as mixing to achieve homogeneity.
Source:
PAC, 1990, 62, 1193. (Nomenclature for sampling in analytical chemistry (Recommendations 1990)) on page 1204 [Terms] [Paper]