In fact, the working principle of the Kjeldahl analyzer has many similarities with the all-glass distillation method. Therefore, in order to verify the feasibility of the Kjeldahl apparatus for the rapid determination of sulfur dioxide in wine, the Kjeldahl tester was used for the distillation. The two methods of blank experiment with glass distillation method were compared, and the Kjeldahl apparatus was used to quickly detect the appropriate amount of sulfur dioxide in the wine, titrate the concentration of iodine solution, and distill the time, and then performed the precision experiment. , recovery experiment. Finally, the results of the determination of sulfur dioxide content in the Kjeldahl method and the whole glass distillation method were compared using 8 commercially available wines as experimental materials. Results The blank experimental results of Kjeldahl distillation and total glass distillation were basically the same. Using Kjeldahl apparatus for the determination of sulphur dioxide in wine, the suitable sample volume is 40 mL, the titration iodine solution concentration is 0.1 mol/L or 0.05 mol/L, the distillation time is greatly shortened to 8 min, RSD is 1.36%, and the average The recovery rate was (102.40±3.26)%, and there was no significant difference between the results of the 8 commercial wine samples and the glass distillation method (P>0.05).
The test results show that the determination of sulfur dioxide in wine by Kjeldahl is not only highly efficient, but also has good precision and high accuracy. Therefore, it is feasible to use it in the batch detection of sulfur dioxide in wine.
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