The solution prepared from the test portion for the analytical procedure. The proportions of test portion and solvent are normally known.
Source:
PAC, 1989, 61, 1657. 'Nomenclature for automated and mechanised analysis (Recommendations 1989)' on page 1660 (https://doi.org/10.1351/pac198961091657)
See also:
PAC, 1990, 62, 1193. 'Nomenclature for sampling in analytical chemistry (Recommendations 1990)' on page 1206 (https://doi.org/10.1351/pac199062061193)