@article{oai:nagoya.repo.nii.ac.jp:00026273,
 author = {高橋, 浩 and 南, 雅代 and 荒巻, 能史 and Takahashi, Hiroshi A. and Minami, Masayo and Aramaki, Takafumi},
 journal = {名古屋大学年代測定研究},
 month = {Mar},
 note = {We initiated the Radiocarbon Intercomparison on Chemical Experiments, Water series (RICE-W) program in 2013 to examine whether or not carbon isotopic fractionation and carbon contamination occur in sample preparations for water 14C analysis. First, we used RICE-W01−W08 samples (seawater, hot-spring water, groundwater, and NaHCO3 solutions) to examine the air-shielding effect of several types of water storage bottles and the effectiveness of an added toxic substance in suppressing biological activity (e.g., HgCl2 solution). The secular change in 14C for ~900 days showed that (1) polyacrylonitrile or glass bottles are appropriate for sample storage, (2) polypropylene bottles are inappropriate for water 14C analysis, and (3) the addition of a toxic substance to suppress biological activity is necessary. Sterilized samples, however, are unsuitable for this program because they require special procedures for transport, disposal, and experiment. We therefore prepared new water standards, RICE-W09−W14, using chemical reagents with no toxic substances. The chemical compositions of the standards were arranged with wide-ranging 14C concentrations similar to those of natural water. While the second stage of the RICE-W program indicated that almost all of the laboratories had nearly identical 14C concentrations, the 14C results prepared by the precipitation method sometimes represented slightly high values. The precipitation method is likely to require a highly precise experimental technique to obtain the actual 14C concentration., 水試料の放射性炭素濃度測定の分析機関相互の比較検証（RICE-W）を実施した結果を報告する．事前の検証のうち，相互比較の品質保証に重要な保管容器についての結果と微生物活動の影響による14C濃度変化についての報告とプロジェクトにおける対応を示した．実施した相互比較では，一部，現代炭素の混入が示される結果があったが，おおよそ良い一致を示している．また，相互比較を実施する上での品質は担保されていると考えている．},
 pages = {98--101},
 title = {水試料の放射性炭素濃度の相互比較と前処理手法の検討 ： RICE-Wプロジェクト},
 volume = {1},
 year = {2017}
}