difference absorption spectroscopy

A highly concentrated analyte in an @[email protected] can be determined with better @[email protected] by replacing the @[email protected] by one containing a solution of the analyte or other @[email protected] of known concentration; this is known as difference absorption @[email protected] Difference spectra can also be obtained by computer or other subtraction methods.
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 1455 [Terms] [Paper]