Determinations of osmium isotope ratios in iron meteorites and iridosmines by ICP-MS
Determinations of osmium isotope ratios in iron meteorites and iridosmines by ICP-MS
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ICP-MS 测定铁陨石和虹彩胺中的锇同位素比
DOI：
10.2343/geochemj.20.233
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发表时间：
1986
影响因子：
0.8
通讯作者：
H. Shimizu
中科院分区：
文献类型：
--
作者：
A. Masuda;T. Hirata;H. Shimizu
用电感耦合等离子体质谱仪（ICP-MS）测定了三种锇试剂、四种土状锇铱合金（铱锇矿）和两种铁辉石中的锇同位素，其1870 S/1920 S的锡永约为1%。我们的同位素比值与以前的比较。除了1870 S丰度的变化符合自然预期外，~（184）Os似乎有轻微的系统偏差，并对~（184）Os进行了讨论。日本北海道三个铱锇矿样品的锇同位素比值非常相似。北海道的环烯醚胺的值比Allegre和Luck（1980）获得的直“O”生长线高3-4%。最后，我们给出了锇的同位素“标准”丰度（%）：1840年代，0.019; 1860年代，1.589; 187年代，1.519; 1880年代，13.24; 1890年代，16.37; 190年代，26.30; 192年代，40.96。这些给出了Os的原子量= 190.24。
Osmium isotopes in three Os reagents, four terrestiral Os-Ir alloys (iridosmine) and two iron mete orites have been measured on an inductively coupled plasma mass spectrometer (ICP-MS), with the preci sion of around 1 % for 1870S/1920S. Comparisons are made of our isotopic ratios with the previous ones. Apart from the variation of 1870S abundance as naturally expected, there seems to be a slight systematic deviation for "'Os. Also some discussions are given to 184Os. The Os isotopic ratios for three iridosmine samples from Hokkaido, Japan, have been found quite similar to each other. The values for the Hokkaido iridosmines are 3-4% higher relative to the straight "'Os growth line obtained by Allegre and Luck (1980) . Finally, the isotopic "standard" abundances (%) for Os are presented by us: 1840s, 0.019; 1860s, 1.589; 187Os, 1.519; 1880s, 13.24; 1890s, 16.37; 190Os, 26.30; 192 Os, 40.96. These give us the Os atomic weight = 190.24.