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When use HPLC and Ultraviolet Spectroscopy to measure the concentration of caffeine in beverage, the results...

When use HPLC and Ultraviolet Spectroscopy to measure the concentration of caffeine in beverage, the results by HPLC is 17.61 mg/7.5 fl oz while the results by Ultraviolet Spectroscopy is 28.84mg/ fl oz. Why there is a huge difference between these two values?

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id ehemtega and idanh d, maan

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