Single Particle Characterization and Total Elemental Concentration Measurements in Polar Ice Using Continuous Flow Analysis-Inductively Coupled Plasma Time-of-Flight Mass Spectrometry
Single Particle Characterization and Total Elemental Concentration Measurements in Polar Ice Using Continuous Flow Analysis-Inductively Coupled Plasma Time-of-Flight Mass Spectrometry
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DOI：
10.1021/acs.est.9b03886
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发表时间：
2019-11-19
影响因子：
11.4
通讯作者：
Fischer, Hubertus
中科院分区：
文献类型：
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作者：
Erhardt, Tobias;Jensen, Camilla M.;Fischer, Hubertus
连续流分析（CFA）已被广泛用于测量冰芯样品中的气溶胶衍生杂质，从而获得过去气溶胶沉积的高分辨率数据集。在这里，我们提出的第一个结果耦合电感耦合等离子体飞行时间质谱仪（TOFMS）到传统的CFA系统。这种设置能够在整个质量范围内精确测量共配准的元素浓度，而不会随着分析物数量的增加而降低灵敏度。由此产生的总元素浓度记录具有类似或更好的分辨率比建立的分光光度法。TOFMS测量快速瞬态信号并仍覆盖整个质量范围的独特能力进一步使得能够检测进入等离子体的单个不溶性颗粒的电离。由此产生的颗粒的质谱可用于研究保存在冰中的矿物尘埃颗粒的相对元素组成。对含铁颗粒的分析表明，格陵兰冰中的大部分颗粒铁与Mg和Al有关，可能是伊利石等粘土矿物的一部分。
Continuous flow analysis (CFA) has become widely used for the measurement of aerosol-derived impurities in ice-core samples, resulting in high-resolution data sets of past aerosol deposition. Here, we present first results from coupling an inductively coupled plasma time-of-flight mass spectrometer (TOFMS) to a traditional CFA system. This setup enables the measurement of exactly coregistered elemental concentrations over the full mass range without degradation of sensitivity with an increasing number of analytes. The resulting total elemental concentration records have similar or better resolution than the established spectrophotometric methods. The unique capability of a TOFMS to measure fast transient signals and to still cover the full mass range furthermore enables the detection of the ionization of individual insoluble particles entering the plasma. The resulting mass spectra of the particles can be used to investigate the relative elemental composition of the mineral dust particles preserved in ice. The presented analysis of iron-bearing particles indicates that most of the particulate iron in Greenland ice is associated with Mg and Al and is likely part of clay minerals such as illite.