(GRGC) The Estuarine Behavior of Osmium

9417321图里基现今海洋中高的187Os/186Os的签名是陆壳风化的结果。地壳O向海洋的供应主要是通过水系输送实现的。不稳定Os的主要形态似乎是流颗粒上的吸附相。在河口环境中，Os的释放和迁移是复杂的，这是因为在河口发生的氧化和还原过程是带状的，并随着沉积物的深度发生，从而起到隔离和释放Os的作用。在纽黑文港的一项研究中发现了人类活动的Os，其特征非地壳值为187Os/186Os约为1，并记录了从该地点向东约15公里的迁移。将这项研究扩展到长岛海湾和哈德逊河，使用类似的人为Osimprint，可能来自纽约市的医院废物，将提供河口O的流动性和流向开阔海洋的衡量标准。初步结果表明，这项研究是可行的，其细节将在以下几页更详细地描述。

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.