Between 1973 and 1994, 15 samples of CI chondrites were analyzed by neutron activation analysis at the Max-Planck-Institute for Chemistry, Department of Cosmochemistry in Mainz, Germany. The analyses comprise nine Orgueil samples and three samples of Ivuna, two of Alais and one of Tonk. Samples came from various sources and had masses between 5 and 600 mg. Most data are published here for the first time. The results for the nine Orgueil samples demonstrate the essentially homogeneous chemical composition of Orgueil at a level of a few milligrams. The analytical results of Ivuna, Alais, and Tonk agree, with only few exceptions, with the results of Orgueil analyses. All samples agree within ±3% in their contents of Sc, Ir, Cr, Fe, Co, Zn, and Se. The elements Sc and Ir represent the refractory component; Cr, Fe, and Co the main component; and Zn and Se the volatile component. Thus, in all CI chondrites there are essentially the same fractions of the fundamental cosmochemical components. The essentially identical chemical composition of all samples shows that their water contents are constant at about 20 ± 5 wt%. There is excellent agreement between the data listed here with data reported in the relevant literature. There is no doubt that the CI composition is a well-defined entity, which is thought to represent the non-gaseous compositions of the solar nebula and the photosphere of the Sun. In addition, we conclude that the recently proposed new CI chondritic chlorine and Br values are too low, when compared to earlier measurements.

中文翻译：

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CI球粒陨石的组成及其氯和溴含量：仪器中子活化分析结果

1973 年至 1994 年间，德国美因茨宇宙化学系马普化学研究所通过中子活化分析对 15 个 CI 球粒陨石样品进行了分析。分析包括九个 Orgueil 样品和三个 Ivuna 样品、两个 Alais 样品和一个 Tonk 样品。样品来自各种来源，质量在 5 到 600 毫克之间。大多数数据都是第一次在这里发布。九个 Orgueil 样品的结果表明，Orgueil 的化学成分基本均一，只有几毫克。除了少数例外，Ivuna、Alais 和 Tonk 的分析结果与 Orgueil 分析的结果一致。所有样品的 Sc、Ir、Cr、Fe、Co、Zn 和 Se 含量均在 ±3% 范围内。Sc和Ir元素代表耐火成分；Cr、Fe、Co主要成分；Zn和Se是挥发性成分。因此，在所有 CI 球粒陨石中，基本宇宙化学成分的分数基本相同。所有样品的化学成分基本相同，表明它们的水含量恒定在约 20 ± 5 wt%。此处列出的数据与相关文献中报告的数据非常一致。毫无疑问，CI成分是一个定义明确的实体，它被认为代表了太阳星云和太阳光球层的非气态成分。此外，我们得出结论，与早期测量相比，最近提出的新 CI 球粒状氯和 Br 值太低。所有样品的化学成分基本相同，表明它们的水含量恒定在约 20 ± 5 wt%。此处列出的数据与相关文献中报告的数据非常一致。毫无疑问，CI成分是一个定义明确的实体，它被认为代表了太阳星云和太阳光球层的非气态成分。此外，我们得出结论，与早期测量相比，最近提出的新 CI 球粒状氯和 Br 值太低。所有样品的化学成分基本相同，表明它们的水含量恒定在约 20 ± 5 wt%。此处列出的数据与相关文献中报告的数据非常一致。毫无疑问，CI成分是一个定义明确的实体，它被认为代表了太阳星云和太阳光球层的非气态成分。此外，我们得出结论，与早期测量相比，最近提出的新 CI 球粒状氯和 Br 值太低。它被认为代表了太阳星云和太阳光球层的非气态成分。此外，我们得出结论，与早期测量相比，最近提出的新 CI 球粒状氯和 Br 值太低。它被认为代表了太阳星云和太阳光球层的非气态成分。此外，我们得出结论，与早期测量相比，最近提出的新 CI 球粒状氯和 Br 值太低。