Collaborative Research: Intercalibrating Analytical Methods for Osmium Isotopes and Concentrations in Seawater

合作研究：海水中锇同位素和浓度的相互校准分析方法

• 批准号: 0751649
• 负责人: Mukul Sharma
• 金额: $ 4.56万
• 依托单位: Dartmouth College
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-07-01 至 2010-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0751649&HistoricalAwards=false
• 关键词: Collaborative; Research; Intercalibrating; Analytical; Methods

Osmium is one of the rarest elements present in the oceans existing in multiple oxidation states. To date, different analytical protocols have been used to analyze seawater samples from the three ocean basins for osmium resulting in different results for each. Scientists from Woods Hole Oceanographic Institute, Dartmouth University, and the University of Hawaii propose to analyze samples collected during the two GEOTRACES intercalibration cruises to determine whether divergent results obtained for the three ocean basins is the result of inherent differences in the system or due to the different analytical protocols. The PIs would intercalibrate an osmium standard and tracer solutions, prepare "osmium free' water and assess blanks, and evaluate the effect of sampling and storage on the osmium isotopic content. As regards broader impacts, accurate and precise osmium concentrations and isotopic ratios would provide the sciences community with a potential new tracer in marine chemistry and paleoceanography.

Os是海洋中存在的最稀有的元素之一，以多种氧化态存在。到目前为止，已经使用不同的分析方案来分析三个大洋盆地的海水样本，导致每个海盆的结果不同。来自伍兹霍尔海洋研究所、达特茅斯大学和夏威夷大学的科学家提议分析在两次GEOTRACES相互校准巡航期间收集的样本，以确定三个大洋盆地获得的不同结果是系统固有差异的结果，还是由于不同的分析方案造成的。在更广泛的影响方面，准确和精确的Os浓度和同位素比率将为科学界提供一种在海洋化学和古海洋学方面潜在的新示踪剂。