(GRGC) The Estuarine Behavior of Osmium

现在海洋中锇的187Os/186Os高特征是大陆地壳风化的结果。地壳o向海洋的供应主要是通过水流输送实现的。不稳定氧的主要形式似乎是流颗粒上的吸附相。在河口环境中，氧的释放和迁移是复杂的，因为氧化和还原过程发生在河口带状上，并随沉积物的深度而发生，这些过程起着隔离和释放氧的作用。在纽黑文港的一项研究中发现了具有187o / 186o特征的非地壳值约为1的人为动员o，并记录了从该地点向东约15公里的运输。将研究扩展到长岛湾和哈德逊河，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通量的测量。初步结果表明这种研究的可行性，其细节将在下面的页面中更详细地描述。

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.