Matthew S. Varonka Lynn M. Crosby Karl B. Haase Keith A. Loftin Michelle L. Hladik Denise M. Akob Calin Tatu Adam C. Mumford Jeanne B. Jaeschke Anne L. Bates Tiffani Schell Isabelle M. Cozzarelli William H. Orem 2019 Water and sediment extracts samples were analyzed for extractable hydrocarbons by gas chromatography/mass spectrometry (GC/MS) using an Agilent (Agilent Technologies, Palo Alto, CA, USA) 7890 series GC and 5975 electron ionization (EI) mass selective detector (MSD) operated in scan mode. Agilent ChemStation software was used for data acquisition and analysis (version E.02.00.493 on GC/MS computer and version F.01.03.2357 on laptop for data workup). A 30 m x 250 m x 0.25 m HP-5MS column (95% dimethyl 5% diphenyl polydimethylsiloxane) was used for GC/MS under the following conditions: 1.0 L splitless injection, constant flow of 0.7 mL/min, solvent delay of 7.5 min, injector temperature of 280C, interface at 300C, temperature program of 50-150C at 7C/min, 150-230C at 6C/min, and 230-300C at 3C/min with mass scanned from 35-500 Da. application/pdf 10.1016/j.apgeochem.2017.02.016 en Elsevier Organic geochemistry and toxicology of a stream impacted by unconventional oil and gas wastewater disposal operations article