Stable carbon and oxygen isotopic analysis of atmospheric carbon monoxide using continuous-flow isotope ratio MS by isotope ratio monitoring of CO.
Stable carbon and oxygen isotopic analysis of atmospheric carbon monoxide using continuous-flow isotope ratio MS by isotope ratio monitoring of CO.
复制标题
通过 CO 同位素比监测，使用连续流同位素比 MS 对大气一氧化碳进行稳定碳和氧同位素分析。
DOI：
10.1021/ac020290x
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发表时间：
2002
影响因子：
7.4
通讯作者：
T. Gamo
中科院分区：
文献类型：
--
作者：
U. Tsunogai;F. Nakagawa;D. Komatsu;T. Gamo
我们开发了一种快速、简单的大气CO含量和稳定同位素组成（13C和18O）的测量系统，使用连续流同位素比质谱法同时监测质量为28、29和30的CO+离子流。分析系统依次由样品捕获口（液氮温度硅胶和分子筛5A）、气体干燥器、CO净化柱（分子筛5A）、低温聚焦装置和气相色谱毛细管最终净化柱组成。对于含有低至300 pmol CO的样品，在40分钟内对一个样品进行分析，13C的分析精度为0.2‰，18O的分析精度为0.4‰。与该方法相关的分析空白小于1pmol。天然CO中氧的质量无关分馏对delta13C的分析误差估计小于0.3‰。在此基础上，我们报道了土壤CO消耗过程中的动力学同位素效应。
We have developed a rapid and simple measurement system for both content and stable isotopic compositions (13C and 18O) of atmospheric CO, using continuous-flow isotope ratio mass spectrometry by simultaneously monitoring the CO+ ion currents at masses 28, 29, and 30. The analytical system consisted sequentially of a sample trapping port (liquid nitrogen temperature silica gel and molecular sieve 5A), a gas dryer, a CO purification column (molecular sieve 5A), a cryofocusing unit, and a final purification column using a GC capillary. Analytical precision of 0.2 per thousand for 13C and 0.4 per thousand for 18O can be realized for samples that contain as little as 300 pmol of CO within 40 min for one sample analysis. Analytical blanks associated with the method are less than 1 pmol. The extent of analytical error in delta13C due to mass-independent fractionation of oxygen in natural CO is estimated to be less than 0.3 per thousand. Based on this system, we report herein a kinetic isotopic effect during CO consumption in soil.