Measurement of dissolved neon by isotope dilution using a quadrupole mass spectrometer
Measurement of dissolved neon by isotope dilution using a quadrupole mass spectrometer
复制标题
使用四极杆质谱仪通过同位素稀释测量溶解的氖
DOI：
10.1016/j.marchem.2004.05.001
复制
发表时间：
2004
期刊：
影响因子：
3
通讯作者：
S. Emerson
中科院分区：
文献类型：
--
作者：
R. Hamme;S. Emerson
本文介绍了一种测定水中溶解氖浓度的分析方法。通过同位素稀释校准测量，在水收集之前将22 Ne加标物直接添加到抽空的样品瓶中。使用玻璃烧瓶进行水取样，用CO2冲洗系统中的空气，大大降低了污染的机会。通过与顶空平衡从水样中提取溶解气体，并进行低温处理以去除干扰。22 Ne/20 Ne的比例，然后在四极质谱仪上测量操作在静态模式。通过对空气中22 Ne/20 Ne比率的频繁分析，解释了系统的质量分馏。我们根据一式两份现场样品的标准差常规获得±0.13%的精密度。该方法的准确度（以可能使所有数据偏斜的可能系统偏移的形式）被评估为± 0.18%，不包括空气中Ne浓度估计值的可能±0.2%误差。
We describe an analytical method with improved precision for measuring the concentration of neon dissolved in water. Measurements were calibrated by isotope dilution, with addition of a22Ne spike directly to the evacuated sample flask prior to water collection. The use of glass flasks for water sampling, with flushing of air from the system by CO2, greatly reduced the chance of contamination. Dissolved gases were extracted from the water sample by equilibration with a headspace and cryogenically processed to remove interferences. The22Ne/20Ne ratio was then measured on a quadrupole mass spectrometer operated in static mode. Mass fractionation by the system was accounted for by frequent analyses of the22Ne/20Ne ratio in air. We routinely obtained precisions of ±0.13% based on the standard deviation of duplicate field samples. Accuracy of the method, in the form of possible systematic offsets that could skew all the data, was assessed to be ±0.18%, excluding a possible ±0.2% error in the estimate of the Ne concentration of air.