票河 ABSTRACT. The simultaneous removal of 兵花nitrogen oxides (NOx) and sulfur dioxide (SO村拿2) by absorption is considered to b資章e one of the most promising te我土chnologies for flue ga為木s treatment, and sulfite is th雜著e main component of th作風e absorption solution. To understa算西nd the chemical behaviors of the NO2 absorption in sulfite solution, 計慢the absorption time dependences o村不f concentrations of nitrog如地en and sulfur composi錯吧tions in both gas phase and li電長quid phases were investigated by flue 新場gas analyzer, Ion chroma媽員tography (IC), Gas chromatography (G呢農C), and Fourier transform i計低nfrared spectrometry (FTIR) methods usi錯黑ng a bubbling reactor.報草 The mass equilibrium of the N and S村志 compositions were also studi山了ed. The results indicate 不黃that sulfite concentration 熱開plays a vital role in綠問 NO2 absorption. The main abs市做orption products are NO3− and NO2−, and NO2− can be converted into N厭唱O3− in the presence of oxygen. Besid子頻es, about 4% to 9% by-products of S師車 compositions are formed, and 4商器% to 11% by-products 多外of N compositions such開自 as NO, N2, N2O5, N2O, and HNO3 in the gas phase were校快 detected in the emissio西你ns from the bubbling reactor. On 長弟the basis of N and S compo從器sitions, a possible pathway of NO2 absorption in s短謝ulfite solution was proposed.