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.

用于岩性元素的新的地球化学示踪剂是通过使用稳定和放射性的同位素来开发的，并被环境样品，河水和海水采用。使用热电离质谱法和使用MC-ICP-MS的外部标准方法进行双峰值方法。为了到海水样品，双峰值方法是环境样本的供应物，因为在化学分离过程中对质量分馏的纠正。所需的样本量为100ng，以达到Anaylytical误差的0.015％。采用了建议的方法来分析河流和海水。河口和表面海水样品显示出明显的同位素分馏。尽管这些变化取决于去除过程。 ND同位素分级与CE的分馏一致。它表明，氧化还原过程的影响对同位素分馏相对较小。

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