Determination of ammonia in beers by pervaporation flow injection analysis and spectrophotometric detection
作者： Lijuan Wang , Terence J Cardwell , Robert W Cattrall , Maria D Luque de Castro , Spas D Kolev
DOI: 10.1016/S0039-9140(03)00235-2
关键词:
摘要: A pervaporation flow injection (PFI) method is described for the determination of ammonia in beers. After injecting sample into a NaOH donor solution, and other volatiles are transferred unit from stream to an acceptor containing sodium salicylate nitroprusside, which subsequently mixes with alkaline dichloroisocyanurate allow classical Berthelot reaction take place. The blue-coloured complex formed monitored spectrophotometrically at 655 nm. linear calibration curve range 0.1-40 mg l(-1) was obtained. has detection limit 0.05 capable sampling frequency 11 h(-1) 4 ammonia. It applied successfully synthetic samples unfiltered lager advantages present over ion-selective electrode PFI system based on mixed indicator discussed.
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