Development of hydrocarbon gas standards for stable isotopic composition (δ13C and δ2H)

First posted January 31, 2022 For additional information, contact: Director, Central Energy Resources Science CenterU.S. Geological SurveyBox 25046, MS-939Denver, CO 80225-0046 A suite of gas standards was developed to serve as international secondary reference materials (RMs) for the determination compound-specific carbon-13/carbon-12 (δ13C) and hydrogen-2/hydrogen-1 (δ2H) values hydrocarbon gases. This report provides background information on project, methods used produce analyze gases, well data analysis recommended stable isotopic values. Additionally, samples older RMs no longer available were analyzed along with new allow traceability historical data. These are intended interlaboratory standardization primary RMs. The gaseous currently (at time publication) purchase from U.S. Survey Program.