| Molar Absorptivity |
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| analytical chemistry | |
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When there is more than one absorbing species in a solution, the absorbance is the sum of the absorbances for each individual species. The absorbance at a given wavelength of a mixture of species X, Y, ... is given by :, where ''A'' is the absorbance of the mixture. The composition of a mixture of two or more compounds can be found by using two or more Wavelength s and by knowing ε at each wavelength for each compound. These wavelengths are usually chosen as the wavelengths of maximum absorption (absorbance maxima) for the individual components. For ''N'' components with concentrations (''i=''1,...,''N'') and ''N'' wavelengths , absorbances are obtained: :. This set of equations can be solved for the concentrations , provided that none of the wavelengths is an ''isosbestic point'' for any pair of species. An Isosbestic Point of two species is a wavelength where the two species have equal extinction coefficients. |
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