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首页> 外文期刊>Journal of chromatography, A: Including electrophoresis and other separation methods >Capillary ion chromatography with on-column focusing for ultra-trace analysis of methanesulfonate and inorganic anions in limited volume Antarctic ice core samples
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Capillary ion chromatography with on-column focusing for ultra-trace analysis of methanesulfonate and inorganic anions in limited volume Antarctic ice core samples

机译：柱上聚焦的毛细管离子色谱法可对痕量南极冰芯样品中的甲磺酸根和无机阴离子进行超痕量分析

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摘要

Preservation of ionic species within Antarctic ice yields a unique proxy record of the Earth's climate history. Studies have been focused until now on two proxies: the ionic components of sea salt aerosol and methanesulfonic acid. Measurement of the all of the major ionic species in ice core samples is typically carried out by ion chromatography. Former methods, whilst providing suitable detection limits, have been based upon off-column preconcentration techniques, requiring larger sample volumes, with potential for sample contamination and/or carryover. Here, a new capillary ion chromatography based analytical method has been developed for quantitative analysis of limited volume Antarctic ice core samples. The developed analytical protocol applies capillary ion chromatography (with suppressed conductivity detection) and direct on-column sample injection and focusing, thus eliminating the requirement for off-column sample preconcentration. This limits the total sample volume needed to 300 mu L per analysis, allowing for triplicate sample analysis with <1 mL of sample. This new approach provides a reliable and robust analytical method for the simultaneous determination of organic and inorganic anions, including fluoride, methanesulfonate, chloride, sulfate and nitrate anions. Application to composite ice-core samples is demonstrated, with coupling of the capillary ion chromatograph to high resolution mass spectrometry used to confirm the presence and purity of the observed methanesulfonate peak. (C) 2015 Elsevier B.V. All rights reserved.
机译：在南极冰层中保存离子物种，是地球气候历史的独特记录。迄今为止，研究一直集中在两个代理上：海盐气溶胶和甲磺酸的离子组分。冰芯样品中所有主要离子种类的测量通常通过离子色谱法进行。以前的方法虽然提供了合适的检测限，但已经基于柱外预浓缩技术，需要更大的样品量，并且有可能污染样品和/或携带残留物。在这里，已经开发出一种基于毛细管离子色谱的新分析方法，用于定量分析有限体积的南极冰芯样品。开发的分析方案应用毛细管离子色谱法（抑制电导检测）并直接在柱上进样和聚焦，从而消除了对柱外样品预浓缩的要求。这将每次分析所需的总样品量限制为300μL，从而允许使用<1 mL样品进行三次重复样品分析。这种新方法为同时测定有机和无机阴离子（包括氟离子，甲磺酸根，氯离子，硫酸根和硝酸根阴离子）提供了可靠而强大的分析方法。证明了其在复合冰芯样品中的应用，并将毛细管离子色谱仪与高分辨率质谱仪相结合，用于确认观察到的甲磺酸根峰的存在和纯度。 （C）2015 Elsevier B.V.保留所有权利。

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