Title: absorbance matching
Long Title: IUPAC Gold Book - absorbance matching
DOI: 10.1351/goldbook.A00029
Status: current

Definition
A procedure where the concentration of a known analyte may be determined by diluting the sample with solvent until the absorbance matches the absorbance of the analyte in the reference cell. This method is particularly useful if the Beer-Lambert law does not hold.

Related Terms
- Beer-Lambert law: https://goldbook.iupac.org//terms/view/B00626
- absorbance: https://goldbook.iupac.org//terms/view/A00028

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 1456 (https://doi.org/10.1351/pac198860091449)

Other Outputs
- html: https://goldbook.iupac.org/terms/view/A00029/html
- json: https://goldbook.iupac.org/terms/view/A00029/json
- xml: https://goldbook.iupac.org/terms/view/A00029/xml

Citation: Citation: 'absorbance matching' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. 10.1351/goldbook.A00029
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Disclaimer: The International Union of Pure and Applied Chemistry (IUPAC) is continuously reviewing and, where needed, updating terms in the Compendium of Chemical Terminology (the IUPAC Gold Book). Users of these terms are encouraged to include the version of a term with its use and to check regularly for updates to term definitions that you are using.
Accessed: 2026-06-29T13:37:52+00:00