increment (for bulk materials and large units)

https://doi.org/10.1351/goldbook.I03003
An individual portion of material collected by a single operation of a sampling device. Increments may be reduced individually or tested either (a) individually or (b) combined with other increments with the resulting @CT07545@ reduced in size and tested as a single unit. Increments are created by the sampling operation and are usually taken from parts of a lot separated in time or space. Increments of a bulk population correspond to units of a packaged population.
Source:
PAC, 1990, 62, 1193. (Nomenclature for sampling in analytical chemistry (Recommendations 1990)) on page 1205 [Terms] [Paper]