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使用AGMP-1M阴离子交换树脂提纯样品中的Fe同位素,利用Nu1700大型多接收等离子体质谱在高分辨率模式下测定铁同位素比值,采用标样-样品交叉法校正仪器的质量歧视效应,对回收率、化学流程本底、酸度效应、浓度效应进行了检验,建立了可靠的高精度铁同位素分析技术。本文测定了常用地质标准样品(BCR-2,BHVO-2,AGV-2,GSR-2,GSR-3)的Fe同位素组成,测定结果与文献报道值在误差范围内一致,其测试精度优于(BCR-2,BHVO-2,AGV-2,GSR-3)0.03‰(2SD)。GSR-2可能受Fe含量较低(TFe_2O_3=4.95%)和均一性的影响,获得的δ~(56)Fe和δ~(57)Fe的测试精度分别为0.05‰和0.07‰(2SD)。
The Fe isotopes were purified using AGMP-1M anion exchange resin. The iron isotope ratios were determined by Nu1700 mass spectrometry in high resolution mode. The mass discrimination effect of the instrument was calibrated by standard cross-sample cross-correlation method. The recoveries , Chemical process background, acidity effect, concentration effect were tested, established a reliable high-precision iron isotope analysis technology. In this paper, the Fe isotopic compositions of common geological samples (BCR-2, BHVO-2, AGV-2, GSR-2 and GSR-3) were measured and the results were consistent with the reported values in the error range. (BCR-2, BHVO-2, AGV-2, GSR-3) 0.03 ‰ (2SD). GSR-2 may be affected by low Fe content (TFe_2O_3 = 4.95%) and homogeneity. The test accuracies of δ ~ (56) Fe and δ ~ (57) Fe are 0.05 ‰ and 0.07 ‰ (2SD), respectively.