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

被引：181

作者：

Levasseur, S ^{[1
]}

Birck, JL ^{[1
]}

Allègre, CJ ^{[1
]}

机构：

[1] Univ Paris 07, Inst Phys Globe, Lab Geochim & Cosmochim, CNRS,URA 1758, F-75252 Paris 05, France

来源：

SCIENCE | 1998年 / 282卷 / 5387期

关键词：

D O I：

10.1126/science.282.5387.272

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Two depth profiles of the osmium concentration and the Os-187/Os-186 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 Os-187/Os-186 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.

引用

页码：272 / 274

页数：3

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