For certain analyses, fluorescence is the method of choice due to its superior sensitivity compared to UV/Visible absorption spectrophotometry. Fluorescence has the potential to be more sensitive- provide that the material under investigation has high quantum efficiency at the wavelengths being used. Fluorescence is a relative technique- this means that a quantitative measurement requires a comparative measurement against a material of known concentration. Validation of the performance of this technique is more challenging compared to other, more absolute, techniques such as absorption spectroscopy.
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