硅酸盐氧同位素标样研制

Preparation of Reference Materials for Oxygen Isotope Determination in Silicates

本文介绍了硅酸盐氧同位素标准物质(SH和H)的研制。均匀性检验证实该标准物质是均匀的。该标准物质采用直接比较测量法标定,即直接与国际标准V-SMOW和SLAP进行比较。 国际标准水样采用CO_2-H_2O平衡法制备CO_2;石英标样采用BrF_5法制备CO_2。将六个定值实验室提供的数据统一处理后,获得SH和H的δ^(18)Ox/v-s_(MOW)值分别为11.11±0.06(‰)和-1.75+0.08(‰)。该标准物质于89年12月被国家技术监督局批准为国家一级标准物质,山阳石英标样(SH)统一编号为GBW04409,浒坑石英标样(H)为GBW04410。

Two quartz reference samples (SH and H) for oxygen isotope determination have been prepared. The homogeneity test proved satisfactory. The values were certified by direct comparison with the international standards V-SMOW and SLAP. For the preparation of CO2 for the samples, CO2-H2O equilibration method were applied for V-SMOW and SLAP, and BrF5 method for the quartz samples. The results provided by six laboratories were submitted to data treatment, and the standard values of δ18O obtained, versus V-SMOW, are 11.11±0.06‰ and -1.75±0.08‰ for the samples SH and H respectively. These two samples were approved as national first-grade certified reference material in 1989 by the State Bureau of Technical Supervision.