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钕同位素比值(~(143)Nd/~(144)Nd)是Sm-Nd同位素方法的关键量值,由于被测样品的~(143)Nd/~(144)Nd比值变化范围很小,所以对~(143)Nd/~(144)Nd比值测试的精准度要求很高(精度优于0.005%)。为了获得高精度和高准确度的测试数据,分析过程中所用Nd同位素标准物质起着重要作用。以往的Nd同位素标准物质都是氧化钕,经过近三十年有的已消耗殆尽。本文阐述了钕同位素比值~(143)Nd/~(144)Nd标准溶液的研制,经检验标准溶液的均匀性和稳定性良好,由11家实验室协同定值,采用MC-TIMS和MC-ICP-MS方法测定~(143)Nd/~(144)Nd,确定了Nd同位素标准溶液的特性值~(143)Nd/~(144)Nd=0.512438,不确定度为5×10-6。此标准溶液于2015年5月获得国家标准样品证书(批号为GSB 04-3258—2015),可被用于地质、资源、海洋、环境、考古等多种样品~(143)Nd/~(144)Nd比值测定时的仪器校准和分析过程的质量监控。
The neodymium isotope ratio (~ (143) Nd / ~ (144) Nd) is the key value for the Sm-Nd isotope method. Since the range of ~ (143) Nd / ~ The accuracy of the ~ (143) Nd / ~ (144) Nd ratio test is very high (accuracy better than 0.005%). In order to obtain high accuracy and high accuracy of the test data, the Nd isotope reference material used in the analysis plays an important role. Previous Nd isotope standards are neodymium oxide, after nearly three decades have been depleted. In this paper, the development of neodymium isotope ratio ~ (143) Nd / ~ (144) Nd standard solution was described. The uniformity and stability of the standard solution were tested. The synergetic values of 11 standard laboratories were determined by MC-TIMS and MC- ICP-MS method was used to determine the value of ~ (143) Nd / ~ (144) Nd = 0.512438 and the uncertainty of 5 × 10-6 for Nd isotope standard solution. The standard solution obtained the national standard sample certificate (batch number GSB 04-3258-2015) in May 2015 and can be used in various samples such as geology, resources, marine, environment and archeology ~ (143) Nd / ~ (144 ) Quality control of instrument calibration and analysis during Nd ratio determination.