3. Results and discussion
3.1. Method optimization
As presented in Fig. 3, addition of carbonate buffer solution to thesampleleadstoadecreaseinsulfitefindingsovertime.Whereas at the beginning, about 70mg/L SO2 was detected, the findings decreased to less than 10mg/L SO2 within 10h. This effect was stronger with the more concentrated and more alkaline carbonate buffer (pH 10.6).