采用氧化物方式高精度测量微量样品钕同位素比值

李潮峰; 陈福坤; 王芳

采用氧化物方式高精度测量微量样品钕同位素比值

李潮峰^{1, 2,},
陈福坤¹,
王芳^{1, 2}

1.
中国科学院地质与地球物理所岩石圈重点实验室, 北京 100029
2.
中国科学院研究生院地球科学学院, 北京 100039

基金项目:

科技部国家重点基础研究发展计划 2006CB403505

国家自然科学基金项目 40525007

详细信息

作者简介:
李潮峰(1976-), 男, 工程师, 同位素地球化学专业.E-mail: lichaofeng2006@yahoo.com.cn

中图分类号: P597
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- 文章访问数: 3383
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- 被引次数: 0
出版历程
- 收稿日期: 2007-06-08
- 刊出日期: 2008-03-25

Precise Measurement of Nd Isotopic Ratio of Micro-Samples Using NdO⁺ Method

LI Chao-feng^{1, 2
,},
CHEN Fu-kun¹,
WANG Fang^{1, 2}

1.
Laboratory for Radiogenic Isotope Geochemistry, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
2.
School of Earth Sciences, Graduate school of Chinese Academy of Sciences, Beijing 100039, China

摘要

摘要: 微量样品Nd同位素比值的高精度测定在地球科学和环境科学研究中具有重要的意义, 同时也是同位素测定的难点.对1ng以下的国际标准样品进行了高精度质谱测试.采用新一代高精度热电离质谱计(IsoProbe-T) 分别运用Nd⁺和NdO⁺测试方法, 多次测量常量(≥200ng) 和超微量(0.25ng、0.5ng和1ng) Nd标准物质(Ames、JMC和Jndi-1) 和实验室内部标准LRIG-Nd溶液.质谱计同位素比值测量均采用静态多接收模式.¹⁴³Nd/¹⁴⁴Nd比值测量的内部精度均优于0.003%.与传统的Nd⁺测量方式相比, NdO⁺测量方式具有显著的优势, 即有极高的灵敏度, 是Nd⁺分析灵敏度的100倍左右.
- 微量样品 /
- Nd同位素 /
- 氧化物 /
- 氧校正
Abstract: Precise measurement of Nd isotopic ratio of micro-samples, being one of the most difficult tasks in measurements of isotopic ratios, plays an important role in research fields of earth and environmental sciences.This study reports the results of precise measurements of Nd isotopic ratios on the solutions of international standard material using less 1 ng samples.Applying the Nd⁺ and NdO⁺ measurement methods, solutions of the standard material (Ames, JMC, and Jndi-1) and the laboratory-own reference material (LRIG-Nd), which contain ≥200 ng to 0.25 ng Nd samples, were measured by a new thermal ionization mass spectrometer (IsoProbe-T).Data acquisition during the isotopic measurement was done by using a static mode with a multiple-receiver configuration.Internal and external precisions obtained for all the measurements of ¹⁴³Nd/¹⁴⁴Nd ratio were better than 0.003%.Compared with the Nd⁺ method, Nd isotopic measurement using the NdO⁺ method distinguishably displays an advantage in high sensibility of measurement, being about 100 times higher than that by using the Nd⁺ method.
- micro-sample /
- Nd isotope /
- oxide /
- correction of oxygen interference

HTML全文

图 1 采用Nd⁺和NdO⁺测量方式测定标准物质¹⁴³Nd/¹⁴⁴Nd同位素比值

Fig. 1. ¹⁴³Nd/¹⁴⁴Nd isotopic ratios of standard material with Nd⁺ technique and NdO⁺ technique

下载: 全尺寸图片幻灯片

表 1 不同测量方式所需的质谱计接收器的排列方式

Table 1. Collector arrangement scheme for different measurement techiques

表 2 采用Nd⁺和NdO⁺测量方式测定标准物质¹⁴³Nd/¹⁴⁴Nd同位素比值

Table 2. ¹⁴³Nd/¹⁴⁴Nd isotopic ratios of standard material with Nd⁺ technique and NdO⁺ technique

表 3 报道的氧同位素组成对比

Table 3. Compilation of the oxygen isotope ratios published in the literature

表 4 标准物质Jndi-1测量数据采用不同方法校正¹⁴³Nd/¹⁴⁴Nd比值的对比

Table 4. Comparison with different mass fraction calibration laws for Jndi-1 standard material

表 5 采用NdO⁺测量方式对标准物质测试结果与对比

Table 5. Comparison of recommended value and determination results of standard material with NdO⁺ technique

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