Quantitative real-time monitoring of multi-elements in airborne particulates by direct introduction into an inductively coupled plasma mass spectrometer☆
Quantitative real-time monitoring of multi-elements in airborne particulates by direct introduction into an inductively coupled plasma mass spectrometer☆
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DOI：
10.1016/j.sab.2012.06.001
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发表时间：
2012-10
期刊：
影响因子：
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通讯作者：
Yoshinari Suzuki;H. Sato;K. Hiyoshi;N. Furuta
中科院分区：
文献类型：
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作者：
Yoshinari Suzuki;H. Sato;K. Hiyoshi;N. Furuta
研制了一种实时测定大气颗粒物中微量元素的校准系统。将空气中的颗粒物直接引入电感耦合等离子体质谱仪，采用外定标法测定了15种微量元素的浓度。外部标准溶液通过超声雾化器（USN）与脱溶系统耦合雾化，并将产生的气溶胶引入等离子体。通过两种方法计算USN引入样品的效率：(1)通过USN引入Cr标准溶液与通过标准气体发生器引入Cr(CO)6标准气体进行比较；(2)将USN产生的气溶胶捕获在过滤器上并进行分析。两种方法得到的Cr引入效率相同，其他元素的引入效率与Cr的引入效率相等。结果表明，该方法对15种元素（Ti、V、Cr、Mn、Co、Ni、Cu、Zn、As、Mo、Sn、Sb、Ba、Tl和Pb）的引入效率均有较好的校正效果。对于低熔点氧化物元素（V, Co, As, Mo, Sb， Tl和Pb），实时数据和过滤收集数据吻合良好。相比之下，对于高熔点氧化物元素（Ti, Cr, Mn, Ni, Cu, Zn， Sn和Ba），实时数据比过滤器收集的数据要小。这说明在电感耦合等离子体的初始辐射区，这8种元素的氧化物并没有完全熔化、汽化、原子化和电离。而对元素回收率进行校正后，可实现定量实时监测，元素回收率可由实时数据/滤波采集数据的比值计算得到。
A new calibration system for real-time determination of trace elements in airborne particulates was developed. Airborne particulates were directly introduced into an inductively coupled plasma mass spectrometer, and the concentrations of 15 trace elements were determined by means of an external calibration method. External standard solutions were nebulized by an ultrasonic nebulizer (USN) coupled with a desolvation system, and the resulting aerosol was introduced into the plasma. The efficiency of sample introduction via the USN was calculated by two methods: (1) the introduction of a Cr standard solution via the USN was compared with introduction of a Cr(CO)6standard gas via a standard gas generator and (2) the aerosol generated by the USN was trapped on filters and then analyzed. The Cr introduction efficiencies obtained by the two methods were the same, and the introduction efficiencies of the other elements were equal to the introduction efficiency of Cr. Our results indicated that our calibration method for introduction efficiency worked well for the 15 elements (Ti, V, Cr, Mn, Co, Ni, Cu, Zn, As, Mo, Sn, Sb, Ba, Tl and Pb). The real-time data and the filter-collection data agreed well for elements with low-melting oxides (V, Co, As, Mo, Sb, Tl, and Pb). In contrast, the real-time data were smaller than the filter-collection data for elements with high-melting oxides (Ti, Cr, Mn, Ni, Cu, Zn, Sn, and Ba). This result implies that the oxides of these 8 elements were not completely fused, vaporized, atomized, and ionized in the initial radiation zone of the inductively coupled plasma. However, quantitative real-time monitoring can be realized after correction for the element recoveries which can be calculated from the ratio of real-time data/filter-collection data.