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See Chinese contents: GB 5009.139-2014 GB 5009.139-2014: National food safety standard -- Determination of caffeine in beverages
This Standard specifies the method for determination of caffeine content in cola beverages, coffee, tea and solid and liquid beverage products - High performance liquid chromatography. This Standard applies to the determination of caffeine content in cola beverages, coffee, tea and their solid and liquid beverage products.
