Three means of pretreatment: detected directly by electronic nose,processed by the enrichment and desorption unit(EDU) or processed by Na_2CO_3 as desiccant were adopted to detect Coca cola,pepsi cola and future cola by electronic nose.

• 本文利用电子鼻并同时采用三种样品预处理方法:直接用电子鼻进行检测(零处理)；经富集与解吸附单元处理和经Na2CO3粉末干燥处理；对可口可乐、百事可乐和非常可乐三种饮料进行了检测.