Improved method of carbon extraction from water sample for radiocarbon measurement

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  • 水試料の放射性炭素濃度測定のための手法改良
  • ミズ シリョウ ノ ホウシャセイ タンソ ノウド ソクテイ ノ タメ ノ シュホウ カイリョウ

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Abstract

We improved the current method of CO2 extraction from DIC in water samples. The improved method is simple and cost-effective, and has no need of carrier gas. In addition, it can be adapted to various water samples with wide range of DIC concentration by using reaction flasks of various sizes. This has the merit of being able to analyze water having low DIC concentration. 　The CO2 extracted from water to headspace of a reaction flask is collected to cryogenic traps on a vacuum line. The gas in flask is introduced to a vacuum line not by bubbling or purging with a carrier gas but by expanding to the line using pressure difference. Water samples injected under the CO2-free condition and atmospheric condition showed the identical 14C concentration, indicating that blank of the new procedure is very low and considered to be negligible. The δ13C values of the extracted CO2 were related with CO2 yield, because of isotopic fractionation. Hence, high CO2 yield must be required, when the measured δ13C values should be used for discussion. On the other hand, 14C concentration of extracted CO2 showed the identical values within error range regardless of CO2 yield. It was concluded that the new procedure can be used as a suitable method for CO2 extraction from DIC in various water samples.

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