Acta Chimica Sinica ›› 2002, Vol. 60 ›› Issue (5): 876-881. Previous Articles     Next Articles

Original Articles

微波辐射辅助快速检测微量亚硝胺的研究

徐杨;朱建华;沈彬;薛军   

  1. 南京大学化学系,南京(210093)
  • 发布日期:2002-05-15

Investigation on fast Determination of Trace N-Nitrosamines Assisted by Microwave Radiation

Xu Yang;Zhu Jianhua;Shen Bin;Xue Jun   

  1. Department of Chemistry, Nanjing University,Nanjing(210093)
  • Published:2002-05-15

The spectrophotometric determination of trace N-nitrosamines in solution was investigated in order to enhance its recovery and sensitivity. Based on the investigation on the recovery below 10% in this method, the reason was found relating to formation of spectrophotometric invisible NO_x (x < 2) species such as NO. Consequently an oxidation tube was added in the instrument to convert these NO_x species into the detectable NO_2, therefore the recovery for N-nitrosamine with concentration of 2 * 10~(-5) ~ 2 * 10~(-8) mol/L could be increased to 80% ~ 98%, close to that of thermal energy analyzer (76% ~ 96%). On the other hand, resulting from the discovery that many N-nitrosamines could be evaporated under microwave radiation, a new method combining microwave radiation with the improved spectrophotometric method was thus reported for determining both N-nitrosamines and nitrogen oxides in tobacco and tobacco products. Within 3 minutes both N-nitrosamines and nitrogen oxides in tobacco or tobacco products could be collected for detection.

Key words: MICROWAVE RADIATION, SPECTROPHOTOMETRY, NITROSAMINE, NITROGEN OXIDE, tobacco

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