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Absorption coefficient of light in a medium is related to the concentration in that medium of the light-absorption agent. Hence, related concepts of the concentration-specific absorption coefficients: mass-specific absorption coefficient (used especially in the optics of turbid media, for example, Stramska M et al 2008) and molar absorption coefficient.
The mass-specific absorption coefficient [mass-1 length2] is defined as follows:
| am = a / Cmv | (1) |
where a is the absorption coefficient defined by Eq 1 in Absorption coefficient, and Cmv [mass length-3] is the mass-per-volume concentration of the light absorbing agent. In aquatic sciences, the mass-specific absorption coefficient is frequently denoted by a* (or ap* when related to particle concentration) and expressed in g m2.
The molar absorption coefficient, usually expressed in liter moles-1 cm-1 in the spectroscopic literature, is defined as follows:
| aM = a / CM | (2) |
where a is the absorption coefficient defined by Eq 1 in Absorption coefficient, and CM [moles liter-1] is the molar concentration of the light absorbing agent.
Given that the volume per unit mass of a medium is temperature dependent, the concentration-specific absorption coefficients also depend on temperature.
| CITATION: Jonasz M. 2009. Absorption coefficient: concentration-specific (www.tpdsci.com/Tpc/AbsCfSpc.php). In: Top. Part. Disp. Sci. (www.tpdsci.com). |
HISTORY: Published: -2009 Modified: 28-Jan-2009 Peer-reviewed: PENDING |
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