Calibrated sulfur isotope abundance ratios of three IAEA sulfur isotope reference materials and V-CDT with a reassessment of the atomic weight of sulfur
Calibrated sulfur isotope abundance ratios of three IAEA sulfur isotope reference materials and V-CDT with a reassessment of the atomic weight of sulfur
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DOI：
10.1016/s0016-7037(01)00611-1
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发表时间：
2001-08-01
影响因子：
5
通讯作者：
Krouse, R
中科院分区：
文献类型：
--
作者：
Ding, T;Valkiers, S;Krouse, R
获得了国际原子能机构(维也纳)分发的硫同位素标准物质的硫同位素丰度比的校准值。为了校准测量，用S-32、S-33和S-34富含的高纯Ag2S材料，用重量法制备了一套合成同位素混合物。将所有材料转化为SF5+气体，然后使用配备有分子流进样系统的特殊气源质谱仪(IRMM的Avogadro II量比较器)测量它们在SF5+物种上的硫同位素比率。S-32/S-34丰度比值分别为22.650 4(20)、22.142 4(20)和23.393 3(17)。V-CDT的~(32)S/~(34)S丰度比为22.643 6(20)，与丁等人的定标比值非常接近。(1999年)。通过这种方式，VCDT标度的零点牢牢地固定在国际单位制SI上。S-32/S-33丰度比分别为126.942(47)、125.473(55)、129.072(32)和126.948(47)。通过这种方式，V-CDT标度的线性度在该范围内得到改善。国际原子能机构-S-1和V-CDT的硫摩尔质量分别为32.063 877(56)和32.063 911(56)，这是迄今报道的硫摩尔质量(原子量)的最小合成不确定度。版权所有(C)2001爱思唯尔科学有限公司。
Calibrated values have been obtained for sulfur isotope abundance ratios of sulfur isotope reference materials distributed by the IAEA (Vienna). For the calibration of the measurements, a set of synthetic isotope mixtures were prepared gravimetrically from high purity Ag2S materials enriched in S-32,S-33, and S-34. All materials were converted into SF,, gas and subsequently, their sulfur isotope ratios were measured on the SF5+ species using a special gas source mass spectrometer equipped with a molecular flow inlet system (IRMM's Avogadro II amount comparator). Values for the S-32/S-34 abundance ratios are 22.650 4(20), 22.142 4(20), and 23.393 3(17) for IAEA-S-1, IAEA-S-2, and IAEA-S-3, respectively. The calculated 32S/34S abundance ratio for V-CDT is 22.643 6(20), which is very close to the calibrated ratio obtained by Ding et al. (1999). In this way, the zero point of the VCDT scale is anchored firmly to the international system of units SI. The S-32/S-33 abundance ratios are 126.942(47), 125.473(55), 129.072(32), and 126.948(47) for IAEA-S-1, IAEA-S-2, IAEA-S-3, and V-CDT, respectively. In this way, the linearity of the V-CDT scale is improved over this range. The values of the sulfur molar mass for IAEA-S-1 and V-CDT were calculated to be 32.063 877(56) and 32.063 911(56), respectively, the values with the smallest combined uncertainty ever reported for the sulfur molar masses (atomic weights). Copyright (C) 2001 Elsevier Science Ltd.