@article{oai:shizuoka.repo.nii.ac.jp:00000461,
 author = {土屋, 理恵 and 和田, 秀樹},
 journal = {静岡大学地球科学研究報告},
 month = {Jul},
 note = {application/pdf, We have established a method for total inorganic carbon(〓CO_2) extraction from seawater using a vacuum system for radiocarbon content analysis using an Accelerator Mass Spectrometry (AMS). In this method, phosphoric acid is added to the seawater sample and 〓CO_2 is extracted with ultrasonic washer. After this operation, the extracted gas is purified cryogenically to CO_2 using Horibe traps set with n-pentane (-130℃) and liquid nitrogen (-196℃) to remove H_2O. The collected CO_2 is reacted with H_2 and converted to graphite. The yield of CO_2 extracted from seawater is about 99.8%. The radiocarbon isotopic accuracy of this method is espected to be better than ±0.04‰ in Δ ^<l4>C. Stable carbon isotopic composition (δ^<l3>C) of residual 〓CO_2 in the sample is almost identical with that of initial extraction.},
 pages = {113--118},
 title = {加速器質量分析計による^<14>C測定のための海水溶存無機炭素真空抽出法},
 volume = {29},
 year = {2002}
}