Assorbanza

Abbozzo
Questa voce sull'argomento spettroscopia è solo un abbozzo.
Contribuisci a migliorarla secondo le convenzioni di Wikipedia.

L'assorbanza (in passato densità ottica, indicata con D) è l'intensità di radiazione elettromagnetica che viene assorbita da un corpo, in spettroscopia è definita come l'opposto del logaritmo della trasmittanza; può essere riferita sia in termini di logaritmo naturale sia con altre basi del logaritmo che per evitare ambiguità è meglio indicare a pedice del simbolo "A":[1]

dove I0 e I1 sono le intensità della luce incidente e della luce che emerge dal campione attraversato a una data lunghezza d'onda.

L'assorbanza è in relazione lineare con la concentrazione di un campione - per concentrazioni sufficientemente basse - secondo la legge di Lambert-Beer. Attraverso tale relazione, le misure di assorbanza sono alla base dell'analisi chimica quantitativa per spettrofotometria.

Note

  1. ^ The International Union of Pure and Applied Chemistry (IUPAC), IUPAC - absorbance (A00028), su goldbook.iupac.org. URL consultato il 3 settembre 2024.

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