A new spectrophotometric method for determination of trace formaldehyde in beer was developed with detection wavelength at 555 nm.Based on studies of reaction conditions,e.g.reagent concentration,reaction temperature and time,and the optimal experimental conditions were established.A 4 mL volume of egg white reagent and a 1.0 mL volume of FeCl3 solution were added into a 4 mL volume of a beer sample,and the mixture was heated at 70℃ for 10 min.After cooling,the coloring solution was determined.The detection...
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