In the first group we choose nine chemical compounds as detect index, they are benzene, toluene, m-xylene, o-xylene, ethylbenzene, butadiene, acetone, 2- Methyl ethyl ketone, 1,3,5- terimeth benzene.

• 在教室、复印室、寝室和办公室内对苯、甲苯、邻二甲苯、间二甲苯、乙苯、丁二烯、丙酮、2-丁酮、1-3-5三甲基苯九种物质进行检测。