高等学校化学学报 ›› 1999, Vol. 20 ›› Issue (12): 1940.

• 论文 • 上一篇    下一篇

TEA法测定NO2的反应机理研究

李密, 张新祥, 应立明, 赵新生   

  1. 北京大学化学与分子工程学院, 北京 100871
  • 收稿日期:1999-01-25 出版日期:1999-12-24 发布日期:1999-12-24
  • 通讯作者: 赵新生
  • 作者简介:李密,男,25岁,硕士研究生.
  • 基金资助:

    国家杰出青年基金资助课题

Reaction Mechanism of NO2Determination by the TEA Method

LI Mi, ZHANG Xin-Xiang, YING Li-Ming, ZHAO Xin-Sheng   

  1. College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
  • Received:1999-01-25 Online:1999-12-24 Published:1999-12-24

摘要: 应用FABMS、NMR、IR、HPLC和紫外吸收光谱研究了室温下三乙醇胺与较高浓度NO2(2.48%)的反应情况,证明反应产物为三乙醇胺硝酸盐和三乙醇胺亚硝酸盐,提出了可能的反应机理,为TEA法监测空气中NO2的浓度提供了依据.

关键词: 三乙醇胺硝酸盐, 三乙醇胺亚硝酸盐, 反应机理, 分子加合物

Abstract: The reaction of triethanolamine(TEA) with NO2was investigated at room temperature. The reaction products were characterized by FABMS, NMR, FTIR, HPLC and UV spectra. It was found that triethanolamine nitrate and triethanolamine nitrite are the main products of the reaction. (HOC2H4)3NH+was identified based on FABMS, 1HNMR, and 13CNMR spectra. Meanwhile, NO3-and NO2-were also determined by FTIR, HPLC and UVspectra. The quantitative relationship between TEA and NO2that infolved in the reaction was determined by experiments. It was found that when TEAwas reacted with NO2in CHCl3with the exclusion of water, a white precipitate formed immediately on addition of NO2, this precipitate could solve easily in strong polarized solvents such as water. Triethanolamine nitrate was obtained through TEA reacted with HNO3in CHCl3at room temperature, moreover the comparison of its spectra and the ones of the products was made. Apossible reaction mechanism was proposed to explain the experimental results. Because N2O4molecule is electron deficient while TEA contains atoms which have one or more lone pairs of electrons available in s or p orbitals, a molecular addition compound might be the reactive intermediate, which can easily be hydrolyzed to give the final products. This reaction mechanism requires a stoichiometric factor of 0.5 for the conversion of gaseous NO2to nitrite ion, which is in agreement with literature values.

Key words: Triethanolamine nitrate, Triethanolamine nitrite, Reaction mechanism, Molecular addition compound

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