摘要:
报道了三种玄武岩标准样品(BCR-2、BIR-1a和GBW 07105)的铁铜锌同位素数据。实验使用HNO3-HF混合酸消解玄武岩标准样品;AGMP-1阴离子交换树脂分离提纯样品中的铜铁锌,利用多接收等离子体质谱仪(MC-ICPMS)测定铁铜锌同位素比值,分析过程中使用样品-标准-样品交叉法校正仪器的质量分馏。实验得到BCR-2、BIR-1a和GBW 07105标准样品的高精度铁铜锌同位素组成(95%置信水平的不确定度)分别为:δ56FeBCR-2-IRMM014＝0.070‰±0.018‰(2SD),δ65CuBCR-2-SRM976＝0.16‰±0.04‰(2SD),δ66ZnBCR-2-IRMM3702＝-0.072‰±0.020‰(2SD);δ56FeBIR-1a-IRMM014＝0.044‰±0.026‰(2SD),δ65CuBIR-1a-SRM976＝0.027‰±0.019‰(2SD),δ66ZnBIR-1a-IRMM3702＝0.085‰±0.032‰(2SD);δ56FeGBW 07105-IRMM014＝0.126‰±0.039‰(2SD),δ65CuGBW 07105-SRM976＝0.12‰±0.01‰(2SD),δ66ZnGBW 07105-IRMM3702＝0.22‰±0.03‰(2SD)。这些数据在误差(不确定度)范围内与国际上已发表的数据是一致的。三个玄武岩标准样品的铁铜锌同位素组成数据的发表为铁铜锌同位素研究提供了统一的标准,使地质样品的铁铜锌同位素数据的质量监控成为可能。
Abstract:
Fe, Cu and Zn isotopic compositions of 3 basaltic standard reference materials of BCR-2, BIR-1a and GBW 07105 were reported in this paper. The basaltic samples were digested with HNO3-HF mixed acids. Anion exchange resin AGMP-1 was used in the separation of Fe, Cu and Zn from other elements. Fe, Cu and Zn isotopic ratios were determined by Multiple Collector-Inductively Coupled Plasma-Mass Spectrometry (MC-ICPMS), and isotopic mass fractionation was calibrated by Standard-Sample bracketing. The Fe, Cu and Zn isotopic composition of 3 basaltic standard reference materials (at 95% confidence level) were as follows: δ56FeBCR-2-IRMM014=0.070‰±0.018‰ (2SD), δ65Cu BCR-2-SRM976=0.16‰±0.04‰ (2SD), δ66ZnBCR-2-IRMM3702=-0.072‰±0.020‰ (2SD); δ56FeBIR-1a-IRMM014 =0.044‰±0.026‰ (2SD), δ65Cu BIR-1a -SRM976=0.027‰±0.019‰ (2SD), δ66ZnBIR-1a-IRMM3702=0.085‰±0.032‰(2SD); δ56FeGBW 07105-IRMM014=0.126‰±0.039‰(2SD), δ65CuGBW 07105-SRM976=0.12‰±0.01‰ (2SD), δ66ZnGBW 07105-IRMM3702=0.22‰±0.03‰(2SD). These data were in good agreement with published data within uncertainties. The Fe, Cu and Zn isotopic data of basaltic reference materials provide a new standard for relevant research, and a method for evaluation of the quality of the whole process of sample preparation and isotope measurement.
下载: