ABSTR短空ACT. The simultaneous購媽 removal of nitrogen oxides (NOx) and sulfur dioxide (SO2) by absorption is considered to be one頻議 of the most promising tec討熱hnologies for flue gas treatment, a通可nd sulfite is the main c們門omponent of the absorption劇離 solution. To understand 水頻the chemical behaviors of the NO2 absorption in sulfite solut商鄉ion, the absorption time dependences吧農 of concentrations of ni麗算trogen and sulfur composit厭地ions in both gas phase and l術也iquid phases were investigated b上街y flue gas analyzer, Ion chromatograph南從y (IC), Gas chromatogra離匠phy (GC), and Fourie高妹r transform infrared spectrometry (FTIR木能) methods using a bubbli腦科ng reactor. The mass 民老equilibrium of the N and鐵司 S compositions were also studied. T信西he results indicate that sulfite concen他員tration plays a vital role in NO月北2 absorption. The main absorption 答見products are NO3− and NO2−, and NO2− can be converted in長讀to NO3− in the presence of ox多路ygen. Besides, about 4% to 9雨術% by-products of S com他火positions are formed, an玩理d 4% to 11% by-products of 化路N compositions such as NO, N2, N2O5, N2O, and HNO3 in the gas phase were d音答etected in the emissions from the bubb雪音ling reactor. On the bas區生is of N and S compositions, a poss也船ible pathway of NO2 absorption in sulfit商議e solution was proposed通綠.