Direct measurement of femtomoles of osmium and the 187Os/186Os ratio in seawater

Science

Volumn 282, Issue 5387, 1998, Pages 272-274

  Levasseur, Sylvain ^a   Birck, Jean Louis ^a   Allègre, Claude J ^a  

^a CNRS   (France)

Author keywords

[No Author keywords available]

Indexed keywords

OSMIUM; SEA WATER;

ISOTOPIC RATIO; OSMIUM; SEAWATER; WATER CHEMISTRY;

ARTICLE; CHEMICAL ANALYSIS; ENVIRONMENTAL MONITORING; PRIORITY JOURNAL; SEA; WATER ANALYSIS;

INDIAN OCEAN;

STAPHYLOCOCCUS PHAGE 187;

EID: 0032500726     PISSN: 00368075     EISSN: None     Source Type: Journal    
DOI: 10.1126/science.282.5387.272     Document Type: Article

References (30)

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5. 2 to the seawater samples.
6. 2) were made instead of one as in the original procedure. No modifications to the method were made beyond that step.
7. 188Os = 0.120343. [J. M. Luck and K. K. Turekian, Science 222, 613 (1983)]. We measured eight 0.5-pg standards, which had a mean value of 0.1748 ± 0.0010 and were undistinguishable within error from the measurements made on faraday cups on the larger standards in (4).
8. 188Os = 0.120343. [J. M. Luck and K. K. Turekian, Science 222, 613 (1983)]. We measured eight 0.5-pg standards, which had a mean value of 0.1748 ± 0.0010 and were undistinguishable within error from the measurements made on faraday cups on the larger standards in (4).
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28. A few results were obtained by M. Sharma and G. J. Wasserburg [Geochim. Cosmochim. Acta 61, 5411 (1997)] with the same technique that was used to estimate the Os concentration in seawater. The data used here are our unpublished results from samples of several other major rivers, whose concentrations range from 5 to 25 pg/kg.
29. The residence time estimate is made with the assumption that the Os river input to the ocean is only 80% of the total input (2).
30. We thank the team of the EDUL mission, especially C. Mével, who agreed to sample seawater for us on an already scheduled mission, and A. Dappoigny, who performed the sampling. We also thank K. W. Burton for helpful discussions. This is Institut de Physique du Globe de Paris contribution 1565.