An error which arises when the @A00028@ of some samples changes with time, e.g. as a result of @P04585@, formation of aggregates or adsorption on the cell wall.
Source: PAC, 1988, 60, 1449. (Nomenclature, symbols, units and their usage in spectrochemical analysis - VII. Molecular absorption spectroscopy, ultraviolet and visible (UV/VIS) (Recommendations 1988)) on page 1457 [Terms] [Paper]