| Abstract: | The Institute of Brewing Analysis Committee has collaboratively tested four methods for the determination of sulphur dioxide in beer over the range 1 to 40 mg/litre. The p-rosaniline method (r95 = 0.51 + 0.10 m. R95 = 0.63 + 0.26 m) was found to have the best precision and is recommended as an alternative to the Monier Williams method (r95 = 0.43 + 0.15 m, R95 = 1.86 + 0.27 m) where high precision at low sulphur dioxide levels is required. The dithiobisnitrobenzoic acid (DTNB) method and the IOB rapid distillation method showed considerably worse precisions. |
