Three secondary reference materials for lithium isotope measurements: Li7-N, Li6-N and LiCl-N solutions
Three secondary reference materials for lithium isotope measurements: Li7-N, Li6-N and LiCl-N solutions
复制标题
DOI：
10.1111/j.1751-908x.2007.00833.x
复制
发表时间：
2007-03-01
影响因子：
3.8
通讯作者：
Millot, Romain
中科院分区：
文献类型：
--
作者：
Carignan, Jean;Vigier, Nathalie;Millot, Romain
CRPG （Nancy, France）通过将Li-7或Li-6峰值与L-SVEC或IRMM-016认证的参考物质混合，制备出具有已知Li浓度和同位素组成的溶液，为Li同位素测量准备了二级参考物质。Li7-N和Li6-N溶液样品（1.5 mol I-1 HNO3）相对于L-SVEC的标称δ Li-7同位素组成分别为30.1% 0和-9.7%0，浓度为100 mg I-1。在CRPG上使用QUAD-ICP-MS重复测量这些样品，在2s置信度水平下，δ Li-7为30.4 +/- 1.1% 0 （n = 13）和-8.9 +/- 0.9%0 （n = 9）。测量了另一种LiCl-N溶液，得到的δ值为9.5 +/- 0.6%0 （n = 3）。在BRGM （Orleans, France）用Neptune MC-ICP-MS进行的测定获得了相同的结果（在2s置信水平下，Li7-N为30.2 +/- 0.3%0,n = 89， Li6-N为-8.0 +/- 0.3%0,n = 38， LiCl-N为10.1 +/- 0.2%0,n = 46）。测量成分相对于Li6N溶液标称值的偏差可能是制备过程中的污染或样品称重过程中的误差。这些二级参考物质，以前通过离子交换树脂或直接分析，可用于检查Li同位素测量的精度在近40%的范围内，并将在J. Carignan或N. Vigier， CRPG的要求下提供给科学界。
The CRPG (Nancy, France) has prepared secondary reference materials for Li isotope measurements by mixing Li-7 or Li-6 spikes and either L-SVEC or IRMM-016 certified reference materials to produce solutions having a known Li concentration and isotopic composition. The Li7-N and Li6-N solution samples (1.5 mol I-1 HNO3) have nominal delta Li-7 isotopic compositions of 30.1 %0 and -9.7%0 respectively relative to L-SVEC and concentrations of 100 mg I-1. Repeated measurement of these samples using the QUAD-ICP-MS at the CRPG yielded delta Li-7 of 30.4 +/- 1.1 %0 (n = 13) and -8.9 +/- 0.9%0 (n = 9) at the 2s level of confidence. An additional LiCl-N solution was measured and yielded a delta value of 9.5 +/- 0.6%0 (n = 3). Identical results were obtained at the BRGM (Orleans, France) from determinations performed with a Neptune MC-ICP-MS (30.2 +/- 0.3%0, n = 89 for the Li7-N, -8.0 +/- 0.3%0, n = 38 for the Li6-N and 10.1 +/- 0.2%0, n = 46 for LiCl-N at the 2s level of confidence). The deviation of measured composition relative to the nominal value for the Li6N solution might be explained by either contamination during preparation or an error during sample weighing. These secondary reference materials, previously passed through ion exchange resin or directly analysed, may be used for checking the accuracy of Li isotopic measurements over a range of almost 40%0 and will be available to the scientific community upon request to J. Carignan or N. Vigier, CRPG.