Precise Isotopic Measurements of Nitrogen at the Sub-Nanomole Level
Precise Isotopic Measurements of Nitrogen at the Sub-Nanomole Level
复制标题
亚纳摩尔水平的氮同位素精确测量
DOI：
--
复制
发表时间：
1998
期刊：
影响因子：
--
通讯作者：
Y. Sano
中科院分区：
文献类型：
--
作者：
N. Takahata;Y. Nishio;N. Yoshida;Y. Sano
利用改进的惰性气体质谱仪，我们研制出了一套在亚纳摩尔水平上测量氮同位素的系统，可以在一个样品上测量^40 Ar/^36 Ar、N_2/^40 Ar、^4 He/^40 Ar和C/N比值以及δ ^15 N值。此外，还可以收集二氧化碳进行δ ^13 C测量。本文介绍了有关分析系统的实验细节，包括氮气净化过程及其性能。对于实际样品，δ ^15 N值和^28 N2/^40 Ar比值的分析误差估计约为0.3%和3%。使用六个玄武岩玻璃，该仪器进行准确的氮同位素测量的能力进行了评估。氮含量、氮同位素和氮/氩比的观测值与文献中的数据一致。一些基础实验和玄武岩玻璃的观察结果表明，新系统可用于地球化学和环境样品中氮同位素的测定。
A system for the isotopic measurement of nitrogen at the sub-nanomole level has been developed using a modified noble gas mass spectrometer, allowing ^40Ar/^36Ar, N_2/^40Ar, ^4He/^40Ar and C/N ratios as well as the δ^15N value to be measured on one sample. Moreover, carbon dioxide can be collected for a δ^13C measurement. The experimental details concerning the analytical system are presented here, including the nitrogen purification procedure and its performance. The analytical errors concerning the δ^15N values and ^28N2/^40Ar ratios were estimated to be about 0.3% and 3% for actual samples. Using six basalt glasses, the ability of the instrument to make accurate nitrogen isotope measurements has been evaluated. The observed values of the nitrogen content, nitrogen isotopes and nitrogen/argon ratios are compatible with the data in the literature. The results of some basic experiments and the observation of basalt glasses demonstrate that the new system can be applied to measuring nitrogen isotopes in geochemical and environmental samples.