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Report No.
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Gas-strip methods of dissolved inorganic carbon in groundwater for radiocarbon analysis

Kato, Toshihiro; Iwatsuki, Teruki; Nishio, Tomohiro*

Groundwater age is an important information to infer the groundwater flow. The radiocarbon ($$^{14}$$C) dating of the groundwater is primary method for the evaluation of groundwater flow. The carbon in the groundwater generally exist as a dissolved inorganic carbon (DIC). Though DIC in groundwater samples is usually collected by chemical precipitation method, the method requires lots of preparation to sample the carbon. Furthermore there are problems with the reproducibility on precipitation and measurement value. This study newly examined the application of gas-strip method to collect DIC in groundwater sample by using JAEA-made gas-strip system. The performance of the CO$$_{2}$$ gas-stripping from groundwater and the influence of sulfide are investigated. Based on these results, the operation procedures of gas-strip system and preparation method for the groundwater samples were summarized in this report.

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