Perfluorooctanoic acid( PFOA) is widely used in industrial production because of its strong chemical stabilities and good hydrophobic and oleophobic properties. It was considered to be a widespread persistent organic pollutant in environment in recent years. The oxidative stress and membrane damage of Escherichia coli exposed to PFOA were measured by flow cytometry( FCM) and the toxic mechanism of PFOA was also preliminarily explored. The results showed that,under the stress of PFOA,the intracellular reacti...