Radiocarbon Intercomparison on Chemical Experiments, Water series (RICE-W)

2016 Fiscal Year Final Research Report

• Project/Area Number: 26340017
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Environmental dynamic analysis
• Research Institution: National Institute of Advanced Industrial Science and Technology
• Principal Investigator: Takahashi Hiroshi 国立研究開発法人産業技術総合研究所, 活断層・火山研究部門, 主任研究員 (70357367)
• Co-Investigator(Renkei-kenkyūsha): NAKAMURA Toshio 名古屋大学, 名誉教授 (10135387)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 水試料 / 溶存無機炭素 / 放射性炭素 / 相互比較

Outline of Final Research Achievements

We initiated the Radiocarbon Intercomparison on Chemical Experiments, Water series (RICE-W) program to examine sample preparations for water 14C analysis. First, we used RICE-W01-W08 samples to examine the air-shielding of water storage bottles and the effectiveness of toxic substance for biological activity. The secular 14C change showed that PAN or glass bottles are appropriate for storage, PP bottles are inappropriate, and a toxic substance is necessary.
Sterilized samples are unsuitable for RICE-W program because they require special procedures for transport and disposal. We 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 similar to those of natural water. While almost all of the laboratories had nearly identical 14C concentrations, the 14C results prepared by the precipitation method sometimes represented slightly high values.

Free Research Field

同位体地球化学