検索対象:     
報告書番号:
※ 半角英数字
 年 ~ 
 年

Comparison of $$^{14}$$C collected by precipitation and gas-strip methods for dating groundwater

地下水の$$^{14}$$C年代測定に関わる試料前処理方法(沈殿法・ガス化法)

中田 弘太郎*; 長谷川 琢磨*; 岩月 輝希 ; 加藤 利弘

Nakata, Kotaro*; Hasegawa, Takuma*; Iwatsuki, Teruki; Kato, Toshihiro

地下水の$$^{14}$$C年代測定に必要な溶存無機炭酸(DIC)の回収法(沈殿法とガス化法)の違いが、$$^{14}$$C測定値に与える影響について検証を行った。その結果、ガス化法で回収されたDICの$$^{14}$$C値は理論的に想定される値と同等の値を示した。一方で、沈殿法で回収されたDICの$$^{14}$$C値は、理論値より高い値を示し、回収処理中に現代炭素による汚染が生じることが確認された。汚染の程度は、使用した試薬の量などから算出することができた。地下水の$$^{14}$$C年代測定については、調査目的に応じてDIC回収方法を選択する必要があると考えられた。

Dissolved inorganic carbon (DIC) for $$^{14}$$C analysis of groundwater is usually extracted by a gas-strip or precipitation method. In this study, the certainty of the two methods for $$^{14}$$C dating were confirmed. DIC and $$^{14}$$C concentrations obtained by the gas-strip method were close to the theoretically predicted $$^{14}$$C value. Conversely, the $$^{14}$$C value obtained by the precipitation method always showed higher values than the predicted values. The difference in $$^{14}$$C value between gas-strip and precipitation methods was assumed to arise owing to contamination of modern carbon used in the precipitation method. The applicability of the precipitation method for groundwater should be considered carefully according to the DIC, $$^{14}$$C concentration of groundwater and purpose of the study being conducted.

Access

:

- Accesses

InCites™

:

パーセンタイル:14.14

分野:Geochemistry & Geophysics

Altmetrics

:

[CLARIVATE ANALYTICS], [WEB OF SCIENCE], [HIGHLY CITED PAPER & CUP LOGO] and [HOT PAPER & FIRE LOGO] are trademarks of Clarivate Analytics, and/or its affiliated company or companies, and used herein by permission and/or license.