The Application of In-situ CFF and TIMS to the Study of Ocean Particle Dynamics

原位CFF和TIMS在海洋颗粒动力学研究中的应用

• 批准号: 9203150
• 负责人: Richard Edwards
• 金额: $ 27.94万
• 依托单位: University of Minnesota-Twin Cities
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-02-15 至 1997-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9203150&HistoricalAwards=false
• 关键词: Application; situ; CFF; TIMS; Study

The focus of this research is to quantify transformation rates between dissolved, colloidal, small particle, and large particle size classes in the surface and deep waters of the Atlantic basin. The approach is to use highly sensitive thermal ionization mass spectrometry and radiochemical procedures to determine 234Th, 228Th, and 230Th in the various size classes. The colloidal phase, traditionally collected along with the filtrate, will be sampled in-situ using a cross-flow filtration technique. Field sampling methods will involve the collection of large particles using filters (33um) and the direct separation and collection of colloidal (5,000 NMW-0.2 um) and dissolved (5,000 NMW) fractions using in-situ cross-flow filtration. These data will allow for a separation of the processes of sorption onto particle surfaces from the aggregation/disaggregation of colloids and suspended particles. In particular, the mass contribution of colloidal Th and the potentially important role colloids play as reactive intermediates in oceanic particle cycling and metal scavenging will be assessed.

这项研究的重点是量化大西洋盆地表层和深水中溶解、胶体、小颗粒和大颗粒尺寸类别之间的转化率。 该方法是使用高灵敏度热电离质谱和放射化学程序来测定各种尺寸类别的 234Th、228Th 和 230Th。 传统上与滤液一起收集的胶体相将使用错流过滤技术进行原位取样。 现场采样方法将涉及使用过滤器 (33um) 收集大颗粒，以及使用原位错流过滤直接分离和收集胶体 (5,000 NMW-0.2 um) 和溶解 (5,000 NMW) 部分。 这些数据将允许将颗粒表面的吸附过程与胶体和悬浮颗粒的聚集/解聚分开。 特别是，将评估胶体钍的质量贡献以及胶体作为海洋颗粒循环和金属清除中的反应中间体所发挥的潜在重要作用。