in-laboratory processing

in analytical chemistry
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.
PAC, 1990, 62, 1193. (Nomenclature for sampling in analytical chemistry (Recommendations 1990)) on page 1204 [Terms] [Paper]