Direct Measurement of Femtomoles of Osmium and the 187 Os/ 186 Os Ratio in Seawater
- 9 October 1998
- journal article
- other
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 282 (5387) , 272-274
- https://doi.org/10.1126/science.282.5387.272
Abstract
Two depth profiles of the osmium concentration and the 187 Os/ 186 Os isotopic ratio in the Indian Ocean showed that the osmium concentration seems to be unaltered by chemical or biological processes occuring in seawater; accordingly, osmium is conservative. These data were obtained from an experimental method that eliminated the problems related to osmium preconcentration. This method led to a new evaluation of the concentration of osmium in seawater; the mean concentration of osmium and the 187 Os/ 186 Os ratio are equal to 10.86 ± 0.07 picograms per kilogram and 8.80 ± 0.07, respectively. The results suggest the existence of an organocomplex that dominates the speciation of osmium in seawater.Keywords
This publication has 19 references indexed in Scilit:
- Variations of the187Os/186Os ratio of seawater over the past 28 million years as inferred from metalliferous carbonatesPublished by Elsevier ,2002
- The record of sea water 187Os/186Os variation through the CenozoicPublished by Elsevier ,2002
- Marine dissolved organic carbon: Are the older values correct?Marine Chemistry, 1997
- Iridium in Natural WatersScience, 1996
- Continental runoff of osmium into the Baltic SeaGeology, 1996
- The analysis of seawater osmiumDeep Sea Research Part II: Topical Studies in Oceanography, 1996
- The osmium isotopic composition of organic-rich marine sedimentsEarth and Planetary Science Letters, 1992
- Osmium-187/Osmium-186 in Manganese Nodules and the Cretaceous-Tertiary BoundaryScience, 1983
- Osmium isotopes as petrogenetic and geological tracersEarth and Planetary Science Letters, 1980
- The Isotopic Constitution of OsmiumPhysical Review B, 1937