Department of Earth Science, University of Siena, Siena, Italy.
Anal Bioanal Chem. 2013 Jan;405(2-3):647-54. doi: 10.1007/s00216-012-5806-0. Epub 2012 Feb 17.
Iodine and bromine species participate in key atmospheric reactions including the formation of cloud condensation nuclei and ozone depletion. We present a novel method coupling a high-performance liquid chromatography with ion chromatography and inductively coupled plasma mass spectrometry, which allows the determination of iodine (I) and bromine (Br) species (IO(3)(-), I(-), Br(-), BrO(3)(-) ) at the picogram-per-gram levels presents in Antarctic ice. Chromatographic separation was achieved using an IONPAC® AS16 Analytical Column with NaOH as eluent. Detection limits for I and Br species were 5 to 9 pg g(-1) with an uncertainty of less than 2.5% for all considered species. Inorganic iodine and bromine species have been determined in Antarctic ice core samples, with concentrations close to the detection limits for iodine species, and approximately 150 pg g(-1) for Br(-). Although iodate (IO(3)(-)) is the most abundant iodine species in the atmosphere, only the much rarer iodide (I(-)) species was present in Antarctic Holocene ice. Bromine was found to be present in Antarctic ice as Br(-).
碘和溴物种参与关键的大气反应，包括云凝结核的形成和臭氧消耗。我们提出了一种新的方法，将高效液相色谱与离子色谱和电感耦合等离子体质谱相结合，允许在南极冰中以皮克/克级的水平测定碘（I）和溴（Br）物种（IO（3）（-）、I（-）、Br（-）、BrO（3）（-））。使用 IONPAC®AS16 分析柱和 NaOH 作为洗脱剂进行色谱分离。所有考虑的物种的检测限为 5 至 9 pg g（-1），不确定性小于 2.5%。已经在南极冰芯样品中测定了无机碘和溴物种，其浓度接近碘物种的检测限，而 Br（-）约为 150 pg g（-1）。尽管碘酸盐（IO（3）（-））是大气中最丰富的碘物种，但仅在南极全新世冰中存在更为罕见的碘化物（I（-））。溴被发现以 Br（-）的形式存在于南极冰中。
