Strong selective adsorption of N-nitrosamines on zeolites
摘要
With the functional group of -N-N=O, N-ni-trosamines are well known to constitute a serious health risk[1]. These toxicant chemicals not only give rise to poisoning sometimes[2], but also play an important role in causing cancer in almost all organs of experimental animals and are therefore likely to be related to human beings, since they have the similar metabolism and meta-balin to those animals[3]. Gaseous nitrogen oxides like NO2, N2O3 and N2O4 are reportedly to react with-secondary amines and form N-nitrosamines in environment[4], and some foods, such as beer and salted fish, contain a high concentration of N-nitrosamines and their precursors. However, tobacco and cigarette smoke are believed to be the largest N-nitrosamines pollution for human beings besides the industrial working place. N-nitrosamines are considered important contributors to the total burden of carcinogens resulting from tobacco, especially tobacco smoke, because they can be deposited directly into the blood following inhalation t