(GRGC) The Estuarine Behavior of Osmium

(GRGC) 锇的河口行为

• 批准号: 9417321
• 负责人: Karl Turekian
• 金额: $ 14.1万
• 依托单位: Yale University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-02-15 至 1999-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9417321&HistoricalAwards=false
• 关键词: GRGC; Estuarine; Behavior; Osmium

9417321 Turekian The present-day high 187Os/186Os signature of osmium in the oceans is the consequence of weathering of continental crust. The supply of crustal Os to the oceans is primarily effected through stream transport. The main form of labile Os appears to be an adsorbed phase on stream particles. Release and mobility of Os in the estuarine environment is complex because of the processes of oxidation and reduction occurring in the estuary zonally and with depth in the sediment which act to sequester and release Os. Anthropogenically mobilized Os, with a characteristically non- crustal value of 187Os/186Os of about 1, has been identified in a study of New Haven Harbor and transport from this site eastward about 15km has been documented. The extension of the study to Long Island Sound and the Hudson River using the comparable anthropogenic Osimprint, probably from hospital waste from New York City, will provide a measure of the mobility of Os in estuaries and the flux to the open ocean. Preliminary results indicate the feasibility of such a study, the details of which are described in greater detail in the following pages.

小行星9417321 现今海洋中锇的高187 Os/186 Os特征是大陆地壳风化的结果。 地壳锇向海洋的供应主要是通过水流输送来实现的。 不稳定的Os的主要形式似乎是流颗粒上的吸附相。 河口环境中Os的释放和迁移是复杂的，这是由于氧化和还原过程发生在河口地带性和沉积物中随深度的增加而发生的，这些过程起着螯合和释放Os的作用。 在纽黑文港的一项研究中发现了人为活动的锇，其特征是非地壳的187 Os/186 Os值约为1，并记录了从该地点向东迁移约15 km。 研究的扩展到长岛海峡和哈德逊河使用的比较， 人为的Osimprint，可能来自纽约市的医院废物，将提供一个测量的流动性的Os在河口和通量的开放海洋。 初步结果表明，这一研究是可行的，下文将更详细地介绍这一研究的细节。