The Application of Thermal Ionization Mass Spectrometry to the Study of Thorium Scavenging in the Oceans

热电离质谱法在海洋清除钍研究中的应用

• 批准号: 8915760
• 负责人: Ken Buesseler
• 金额: $ 15.82万
• 依托单位: Woods Hole Oceanographic Institution
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-03-01 至 1992-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8915760&HistoricalAwards=false
• 关键词: Application; Thermal; Ionization; Mass; Spectrometry

This proposal is aimed at examining the partitioning of Th between the dissolved phase and various naturally occurring colloidal and suspended particulate surfaces. This information will be used to examine in more detail the mechanisms of scavenging. In particular, such measurements would allow for a separation of the processes of sorption onto particle surface from the aggregation and disaggregation of colloids and suspended particles. %%% Increased analytical sensitivity is needed for the proposed Th- 230 and Th-232 determinations, as traditional radiochemical analyses of these isotopes require thousands of liters of seawater. It is proposed to develop techniques which utilize thermal ionization mass spectrometry (TIMS) for these analyses. Sub-liter (for Th-232) and 1-10 liter (for Th-230) natural seawater samples could thereby be used for this study. A number of samples under differing particle regimes will be examined, ranging from vertical profiles in the open ocean, to coastal waters collected during periods of intense biological activity (spring and summer) and periods of physical resuspension (fall and winter).

这项建议的目的是审查划分的Th 溶解相和各种天然存在的 胶体和悬浮颗粒表面。 这些信息 将被用来更详细地检查的机制， 拾荒 特别是，这种测量将允许 颗粒表面吸附过程的分离 从胶体的聚集和解聚， 悬浮颗粒 %%% 对于拟议的Th-，需要提高分析灵敏度 230和Th-232测定，如传统的放射化学 这些同位素的分析需要数千升的 海水 建议开发技术， 热电离质谱（TIMS）用于这些分析。 亚升（Th-232）和1-10升（Th-230）天然 因此，海水样本可用作这项研究。 一 不同颗粒状态下的样品数量将是 从开阔洋的垂直剖面，到 沿海沃茨收集期间，密集的生物 活动（春季和夏季）和体育活动期间 再悬浮（秋季和冬季）。