The benz(a)pyrene discharged by vehicles was collected by air samplers with glass fiber filters,then analyzed by HPLC after supersonic extraction and clarification by centrifuge.

• 用超细玻璃纤维滤膜采集杭州市某道路上机动车排放的苯并（a）芘，经超声萃取，高速离心后直接进HPLC分析。