Detection of Perfluoroalkyl and polyfluoroalkyl substances (PFAS)

主题:    Detection of Perfluoroalkyl and polyfluoroalkyl  substances (PFAS)

主讲人:   Jinxia Liu

地点:   松江校区环境学院3150

会议室时间:   2017-10-23 10:00:00

组织单位:   环境科学与工程学院

主讲人简介：Dr. Liu focuses her work on environmental fate, behaviors, and  bioavailability of emergingorganic contaminants, particularly polyfluoroalkyl  and perfluoroalkylsubstances (PFAS). She is also developing novel materials and  treatmentprocesses to remove PFASs from contaminated water and soil. Her  researchprovides industry, policy- and decision-makers with information to make  sounddecisions on themanufacture, assessment, andmanagement of organic  chemicals.

内容摘要：Inthe aftermath of the 2013  Lac-Mégantic(Quebec,Canada)derailmentaccident, the emergency response entailed  the deployment of aqueous filmforming foams (AFFFs) that contained proprietary  fluorosurfactants. The presentstudy examines the environmental occurrence of  over 100 legacy andnewly-identified polyfluoroalkyl andperfluoroalkyl substances  (PFASs) in the benthic fish white sucker (Catostomuscommersonii), sediments from  LakeMégantic and Chaudière River, and soilsfrom the site of accident and  biopiles.Overall, the levels of PFAS in sedimentsand fish remained low, only  slightly higher than those before the accident.Soil samples showed a much  greater numberof PFAS compounds and also at levels significantly greater than  non-impacted soilbut remain lower than Canada provisionalvalues.

We attributed a fewfactors to the overall low PFAS levels found in the region  despite the largevolume of AFFFs released. The cleanup effort implementedto  remove petroleum hydrocarbons from wastewater appeared to have removed a  significantportionof AFFFs and PFASs from the waste stream. The AFFFs used  during the accident belong to the new generation of firefightingagents, free of  perfluorooctane sulfonate (PFOS) perfluorooctanoic acid (PFOA),and are less  bioaccumulative than the older formulations. Aside from verifyingthe  effectiveness of PFOS ban in Quebec, the knowledge generated from the  studyprovides insight into the fate and behaviors or PFAS in engineered water  andsoil treatment processes that are designed to remove petroleum  hydrocarboncontaminants.