苯、甲苯具有沸点低,易挥发等特点,在生产和使用过程中,常以蒸气形式经人体呼吸道吸入,进入肺脏中,大部分不经代谢转化,以原形从呼吸道排出体外。因此,通过采集呼出气可估测接触者的实际接触水平和自呼吸道吸收及排出情况;另一方面利用呼出气可作为生物监测的样品,其优点是易收集,可连续采样,受试者无痛苦,目前已受到人们的日益关注,并初步利用其方法对某些挥发性物质进行卫生学评价。但在我国关于苯、甲苯的呼 Benzene and toluene have the characteristics of low boiling point and easy volatilization. In the process of production and use, they are usually inhaled through the human respiratory tract in the form of vapor and enter the lungs. Most of them are not metabolized and are excreted from the respiratory tract in the prototype. Therefore, the actual contact level of the contacts and the absorption and discharge from the respiratory tract can be estimated by collecting exhaled breath; on the other hand, exhaled breath can be used as a sample for biological monitoring, which has advantages of easy collection, continuous sampling, no subjects The pain has now attracted the attention of the people and initially used its method to make hygienic evaluation of certain volatile substances. But in our country on benzene, toluene call