Chemical evaluation of the ABA pretreatment of charcoal samples for radiocarbon dating

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  • Atsumi Shin
    Department of Applied Chemistry, Faculty of Science, Tokyo University of Science
  • Yoneda Minoru
    Department of Integrated Biosciences, Graduate School of Frontier Sciences, The University of Tokyo
  • Shibata Yasuyuki
    Environmental Chemistry Division, National Institute for Environmental Studies
  • Hokura Akiko
    Department of Applied Chemistry, Faculty of Science, Tokyo University of Science
  • Nakai Izumi
    Department of Applied Chemistry, Faculty of Science, Tokyo University of Science

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Other Title
  • 放射性炭素年代測定における炭化物試料の酸—塩基—酸前処理法に対する化学的検証
  • 放射性炭素年代測定における炭化物試料の酸-塩基-酸前処理法に対する化学的検証
  • ホウシャセイ タンソ ネンダイ ソクテイ ニ オケル タンカブツ シリョウ ノ サン エンキ サン ゼン ショリ ホウ ニ タイスル カガクテキ ケンショウ

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Acid-Base-Acid (ABA) pretreatment has been used for 14C dating of charcoals in the earth science and archaeological fields. However, the method is not based on an objective and independent criterion such as when alkaline extraction should be finished but on an empirical criterion such as a visual check of the color of the alkaline extracted solution. This study aimed to test the correlation of measured 14C dates with alkaline treatment, using 3D fluorescence spectroscopy for the first time. Late Holocene archaeological charcoal samples were subjected to 14C dating by accelerator mass spectrometry (AMS). The result of 3D fluorescence spectroscopy shows that the extraction of humic substances continued even after the color of the solution became clear. The dating result supported this finding. These results suggest the unsuitableness of visual examination as the criterion for alkaline extraction.

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