Pre‐treatment Methods for Accurate Determination of Total Nitrogen and Organic Carbon Contents and their Stable Isotopic Compositions: Re‐evaluation from Geological Reference Materials

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  • Wataru Fujisaki
    Faculty of Life and Environmental Sciences University of Tsukuba 1‐1‐1 Tennodai Tsukuba Ibaraki 305‐8572 Japan
  • Yohei Matsui
    Advanced Science‐Technology Research (ASTER) Program Institute for Extra‐cutting‐edge Science and Technology Avant‐garde Research (X‐star) Japan Agency for Marine‐Earth Science and Technology (JAMSTEC) 2‐15, Natsushima‐cho Yokosuka‐city Kanagawa 237‐0061 Japan
  • Hisahiro Ueda
    Super‐cutting‐edge Grand and Advanced Research (SUGAR) Program Institute for Extra‐cutting‐edge Science and Technology Avant‐grade Research (X‐star) Japan Agency for Marine‐Earth Science and Technology (JAMSTEC) 2‐15, Natsushima‐cho Yokosuka‐city Kanagawa 237‐0061 Japan
  • Yusuke Sawaki
    Department of Earth Science and Astronomy The University of Tokyo 3‐8‐1 Komaba Meguro Tokyo 153‐8902 Japan
  • Katsuhiko Suzuki
    Submarine Resources Research Center Research Institute for Marine Resources Utilization (MRU) Japan Agency for Marine‐Earth Science and Technology (JAMSTEC) 2‐15, Natsushima‐cho Yokosuka‐city Kanagawa 237‐0061 Japan
  • Teruyuki Maruoka
    Faculty of Life and Environmental Sciences University of Tsukuba 1‐1‐1 Tennodai Tsukuba Ibaraki 305‐8572 Japan

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<jats:p>This study reports total nitrogen (TN), carbon (TC) and organic carbon (TOC) contents, as well as stable isotopic ratios (δ<jats:sup>15</jats:sup>N<jats:sub>TN</jats:sub>, δ<jats:sup>13</jats:sup>C<jats:sub>TC</jats:sub> and δ<jats:sup>13</jats:sup>C<jats:sub>org</jats:sub>), from marine, stream and lacustrine geological reference materials (JMs‐1, JMs‐2, SBC‐1, SCo‐2, JSd‐3, JSd‐4 and JLk‐1), which can be classified into two types; modern surface, and ancient, sediments. Using this newly obtained data set, we systematically investigated the biases of three pre‐treatment methods for nitrogen and carbon measurements: (1) non‐acidification (untreated method), (2) HCl acidification in various conditions and subsequent rinsing with high‐purity water repeatedly (rinse method) and (3) <jats:italic>in situ</jats:italic> acidification in a gold‐coated silver capsule (capsule method). Our results showed that such acid pre‐treatments can affect both nitrogen and carbon measurements, except for the carbon data of the ancient geological RMs. Therefore, the nitrogen analysis should be conducted using untreated samples while carbon data should be obtained using the capsule method for modern surface sediments and the rinse method (6 mol l<jats:sup>‐1</jats:sup> HCl acidification at 70 °C) for ancient sediments. We believe that using appropriate pre‐treatment methods is crucial to deriving new interpretations of ancient/modern environmental processes and mechanisms in the future.</jats:p>

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