*Applications may be reviewed on a rolling-basis and this posting could close before the deadline. Click here for information about the selection process.EPA Office/Lab and Location: A research opportunity is available at the Environmental Protection Agency (EPA), Office of Research and Development (ORD), Center for Environmental Measurement and Modeling (CEMM), Atmospheric and Environmental Systems Modeling Division (AESMD), Atmospheric Chemistry and Aerosols Branch (ACAB) located in Research Triangle Park, North Carolina.Research Project: Per- and polyfluoroalkyl substances (PFAS) are used in a wide variety of industrial applications, including textiles, materials, and chemical manufacturing, due to the beneficial mechanical properties and relative inertness they can provide to consumer and industrial products. Upon being released into the environment, these compounds are subject to slow, or negligible, environmental degradation and are thus considered as an emerging class of pollutants capable of persistent global buildup, thereby increasing human exposure. PFAS, including byproducts of combustion, incineration and/or thermal treatment of PFAS, are believed to number in the thousands, without considering the likely complex array of potential environmental degradates and trans formates. The rate at which these chemicals are produced and released to environments often vastly outpaces the time required for the development of traditional measurement approaches that typically focus on a small subset of chemicals that occurs over multiple years. Advances in high resolution mass spectrometry, including Chemical Ionization Mass Spectrometry (CIMS) & Proton Transfer Mass Spectrometry (PTR-MS), when coupled with data analytics, can provide a means of broadening the window of PFAS identification and quantification. The focus of this research project is to collaborate with a multidisciplinary team of researchers, to understand the atmospheric behavior of per- and poly-fluorinated compounds in the ambient atmosphere. The research participant may investigate potential transformation and removal pathways (including homogeneous transformations, as well as wet & dry deposition, and bi-directional gas exchange) of PFAS, with a focus on those pathways that might be relevant to elevated surface and/or drinking water concentrations of PFAS. Under the guidance of a mentor, the research participant may be involved in the following research activities:Calibration and optimization of Chemical Ionization Mass Spectrometer (CIMS) and/ or Proton Transfer Mass Spectrometer (PTR/MS) for identification and quantification of Per and Polyfluorinated Alkyl Substances (PFAS), including products of incomplete combustionAtmospheric Homogeneous chemistry of PFASAtmospheric heterogeneous chemistry of PFASAtmospheric organic aerosol partitioning and multigenerational agingLearning Objectives: The research participant will have the opportunity to gain experience applying instruments to laboratory and field settings. The research participant may also learn how laboratory and field evaluations influence air quality modeling efforts, how to design sensitivity evaluations, and how to analyze the impacts of method improvements and developments. The research participant will have the opportunity to present their research through a combination of reports and technical presentations. The research conducted may also contribute to a manuscript for submission to a peer-reviewed journal. Mentor(s): The mentor for this opportunity is John Offenberg (firstname.lastname@example.org). If you have questions about the nature of the research please contact the mentor(s).Anticipated Appointment Start Date: ~January 2021. All start dates are flexible and vary depending on numerous factors. Click here for detailed information about start dates.Appointment Length: The appointment will initially be for six months and may be renewed up to three to four additional years upon EPA recommendation and subject to availability of funding.Level of Participation: The appointment is full-time.Participant Stipend: The participant will receive a monthly stipend commensurate with educational level and experience. Click here for detailed information about full-time stipends.EPA Security Clearance: Completion of a successful background investigation by the Office of Personnel Management (OPM) is required for an applicant to be on-boarded at EPA.ORISE Information: This program, administered by ORAU through its contract with the U.S. Department of Energy (DOE) to manage the Oak Ridge Institute for Science and Education (ORISE), was established through an interagency agreement between DOE and EPA. Participants do not become employees of EPA, DOE or the program administrator, and there are no employment-related benefits. Proof of health insurance is required for participation in this program. Health insurance can be obtained through ORISE.Questions: Please see the FAQ section of our website. After reading, if you have additional questions about the application process please email EPArpp@orau.org and include the reference code for this opportunity.