Capillary ion chromatography with on-column focusing for ultra-trace analysis of methanesulfonate and inorganic anions in limited volume Antarctic ice core samplesстатья

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[1] Capillary ion chromatography with on-column focusing for ultra-trace analysis of methanesulfonate and inorganic anions in limited volume antarctic ice core samples / R. E. Sanz, S. Poynter, M. Curran et al. // Journal of Chromatography A. — 2015. — Vol. 1409. — P. 182–188. Preservation of ionic species within Antarctic ice yields a unique proxy record of the Earth’s climate his-tory. Studies have been focused until now on two proxies: the ionic components of sea salt aerosol andmethanesulfonic acid. Measurement of the all of the major ionic species in ice core samples is typically car-ried out by ion chromatography. Former methods, whilst providing suitable detection limits, have beenbased upon off-column preconcentration techniques, requiring larger sample volumes, with potentialfor sample contamination and/or carryover. Here, a new capillary ion chromatography based analyti-cal method has been developed for quantitative analysis of limited volume Antarctic ice core samples.The developed analytical protocol applies capillary ion chromatography (with suppressed conductivitydetection) and direct on-column sample injection and focusing, thus eliminating the requirement foroff-column sample preconcentration. This limits the total sample volume needed to 300 uL per analysis,allowing for triplicate sample analysis with <1 mL of sample. This new approach provides a reliable androbust analytical method for the simultaneous determination of organic and inorganic anions, includ-ing fluoride, methanesulfonate, chloride, sulfate and nitrate anions. Application to composite ice-coresamples is demonstrated, with coupling of the capillary ion chromatograph to high resolution massspectrometry used to confirm the presence and purity of the observed methanesulfonate peak. [ DOI ]

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