“…Methods of determining SO 2 include iodimetry, gas chromatography, 1,2 ion chromatography, [3][4][5][6] capillary isotachophoresis, 7 conductimetry, [8][9][10] fluorimetry, 11,12 chemiluminescence, 13,14 optical fiber sensors 15,16 and electrochemical methods. [17][18][19][20][21][22][23][24][25] Compared with other methods, electrochemical methods are fast, sensitive and convenient. However, although very useful, there have been some problems.…”