The generation of oxygen from electrolysis in gel electromembrane extraction (G-EME) causes a negative error when applied to the analysis of easily oxidized species such as nitrite. Nitrite in G-EME is oxidized by oxygen to nitrate, leading to the negative error and the impossibility of simultaneous analysis. In this work, the application of oxygen scavengers to the acceptor phase of the G-EME system was attempted to minimize the oxidation effect. Several oxygen scavengers were selected and examined according to their compatibility with ion chromatography. The mixture of sulfite and bisulfite showed the highest efficiency in preventing the oxidation of nitrite to nitrate. After optimizing all the parameters, This method was applied to the simultaneous determination of nitrite and nitrate in sausage samples.
- Thidarat Samkumpim
- Waleed Alahmad
- Hadi Tabani
- Pakorn Varanusupakul
- Charoenkwan Kraiya