Development of new geochemical tracer using stable and radiogenic cerium isotopes

使用稳定的放射性铈同位素开发新型地球化学示踪剂

• 批准号: 23710017
• 负责人: HIROFUMI Tazoe
• 金额: $ 2.91万
• 依托单位: Hirosaki University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Young Scientists (B)
• 财政年份: 2011
• 资助国家: 日本
• 起止时间: 2011 至 2013
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-23710017/
• 关键词: セリウム安定同位体; 酸化還元過程; 鉄; 陸源物質; 放射壊変起源同位体; 希土類元素; 供給源; セリウム; ネオジム; 安定同位体分別; 北太平洋亜寒帯; レアアース; 環境動態; 安定同位体; トレーサー

New geochemical tracer for lithogenic elements was development by using stable and radiogenic cerium isotopes, and adopted to environmental sample, river and seawater. Double spike method using thermal ionization mass spectrometry and external standard method using MC-ICP-MS were examined. In order to seawater sample, double spike method was suitalbe for environmental sample, because of correction to mass dependent fractionation during chemical separation. Requied sample size was 100ng to achieve 0.015% of anaylytical error. Proposed method was adopted for analysis of river and seawater. Estuary and surface seawater samples showed distinct isotopic fractionation. These variations were though to be depends on the removal process. Nd isotopic fractionation was consistent with those of Ce. It suggested that influence of the redox process was relatively small to the isotopic fractionations.

利用稳定的放射性铈同位素开发了新型成岩元素地球化学示踪剂，并应用于环境样品、河流和海水。对使用热电离质谱的双加标法和使用 MC-ICP-MS 的外标法进行了检查。对于海水样品，双加标法适用于环境样品，因为它对化学分离过程中质量相关的分馏进行了修正。为实现 0.015% 的分析误差，所需的样本量为 100 ng。采用所提出的方法对河流和海水进行分析。河口和表层海水样本显示出明显的同位素分馏。这些变化被认为取决于去除过程。 Nd 同位素分馏与 Ce 的同位素分馏一致。这表明氧化还原过程对同位素分馏的影响相对较小。

项目成果

RADIOACTIVE POLLUTION FROM FUKUSHIMA DAIICHI NUCLEAR POWER PLANT IN THE TERRESTRIAL ENVIRONMENT

• DOI: 10.1093/rpd/ncs222
• 发表时间: 2012-01-01
• 期刊: RADIATION PROTECTION DOSIMETRY
• 影响因子: 1
• 作者: Tazoe, H.;Hosoda, M.;Yamada, M.
• 通讯作者: Yamada, M.

Surface Nd isotopic distribution in the South Pacific Ocean and the Pacific sector of the Southern Ocean

南太平洋和南大洋太平洋区表面 Nd 同位素分布

• 发表时间: 2011
• 作者: Hirofumi Tazoe;Hiromi Sato;Hisao Nagai;Hajime Obata and Toshitaka Gamo
• 通讯作者: Hajime Obata and Toshitaka Gamo

Distribution of neodymium isotopic composition in surface waters of the western South Pacific

南太平洋西部表层水中的钕同位素组成分布

• 发表时间: 2012
• 作者: Hajime Obata;Hirofumi Tazoe;Hiromi Sato;Hisao Nagai;Toshitaka Gamo
• 通讯作者: Toshitaka Gamo