HIGHLIGHTS
- who: Patxi Pu00e9rez-Ramallo from the rubber septaSamples where then flush/filled with helium at , mL/min for , min. Following reaction with, % phosphoric acid, gases evolved from the samples were analysed to stable carbon and oxygen isotopic composition using a Thermo Gas Bench , connected to a Thermo Delta V Advantage Mass Spectrometer at the Department of Archaeology, Max Planck Institute for the Science of Human History. Stable oxygen (u03b4 O) and carbon isotope (u03b4 C) values were calibrated against international standards (IAEA NBS, IAEA, IAEA CO8) registered by the International Atomic Energy Agency: IAEA NBS, : u03b4 C . . .
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