| 6 | |
| 7 | Absorbance is not an arbitrary unit - another argument not to use something similar to "A U" here, as it might be misleading and be used with the meaning "arbitrary unit". |
| 8 | |
| 9 | Reference: http://goldbook.iupac.org/A00028.html |
| 10 | |
| 11 | IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997). XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic, J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8. doi:10.1351/goldbook. |
| 12 | |
| 13 | Definition of the quantity absorbance, symbol ''A'' |
| 14 | Logarithm of the ratio of incident to transmitted radiant power through a sample (excluding the effects on cell walls). Depending on the base of the logarithm a decadic and Napierian absorbance are used. Symbols (for the quantity): ''A'', ''A_10'', ''A_e''. This quantity is sometimes called extinction, although the term extinction, better called attenuance, is reserved for the quantity which takes into account the effects of luminescence and scattering as well. |