Single-particle characterization of four "Asian Dust" samples collected in Korea, using low-Z particle electron probe X-ray microanalysis.
Single-particle characterization of four "Asian Dust" samples collected in Korea, using low-Z particle electron probe X-ray microanalysis.
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DOI：
10.1021/es049772b
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发表时间：
2005-03
影响因子：
11.4
通讯作者：
C. Ro;H. Hwang;Hyekyeong Kim;Y. Chun;R. Van Grieken
中科院分区：
文献类型：
--
作者：
C. Ro;H. Hwang;Hyekyeong Kim;Y. Chun;R. Van Grieken
介绍了一种单粒子分析技术，即低Z粒子电子探针X射线微区分析技术（low-Z粒子电子探针分析），采用一个X射线探测器和使定量测定甚至低Z元素，如C，N和O，被应用到表征“亚洲尘埃”样品，收集在春川，韩国，在四个亚洲沙尘暴事件期间，2000年3月7日，2000年4月7日，2001年3月22日和2001年5月17日在这项研究中，它表明，使用低Z粒子电子探针的单粒子分析提供了样品中的各种类型的化学物种的详细信息。最常见的颗粒，无论是粗粒级还是细粒级，都是铝硅酸盐。四个亚洲尘埃样本中这些颗粒的相对丰度根据其尺寸而有所不同。2000年3月7日采集的样本在运输过程中没有发生任何化学变化，因为样本中不含大气反应产生的化学物质颗粒。2000年4月7日采集的样本含有真正的海盐颗粒和反应过的海盐颗粒。真正的海盐是以NaCl和MgCl 2的混合物的形式存在的，它们在通过黄海时被夹带。反应后的海盐颗粒在细粒级中非常多。2001年3月22日采集的样品显示出CaCO 3和海盐颗粒的化学变化。对于该样品，遇到了大量反应的CaCO 3和海盐颗粒，例如含有硝酸盐和/或硫酸盐的颗粒，这意味着CaCO 3和海盐颗粒在其长距离运输期间与硫或氮氧化物物质反应。2001年5月17日采集的样本在运输过程中经历了最广泛的化学变化。除了观察到广泛反应的CaCO 3和海盐颗粒，反应的K2 CO 3颗粒也广泛遇到在这个样品中，这意味着K2 CO 3物种应被视为一个额外的重要的化学物种在亚洲尘埃颗粒的化学改性的研究在远程传输。
A single-particle analytical technique, named low-Z particle electron probe X-ray microanalysis (low-Z particle EPMA), employing an ultrathin window X-ray detector and enabling the quantitative determination of even low-Z elements such as C, N, and O, is applied to characterize "Asian Dust" samples, collected in ChunCheon, Korea, during four Asian Dust storm events on March 7, 2000, April 7, 2000, March 22, 2001, and May 17, 2001. In this study, it is demonstrated that single-particle analysis using the low-Z particle EPMA provides detailed information on various types of chemical species in the samples. The most abundantly encountered particles, both in coarse and fine fractions, are aluminosilicates. The relative abundances of those particles on the basis of their size are different between the four Asian Dust samples. The sample collected on March 7, 2000 did not experience any chemical modification during its transport because the sample does not contain particles of chemical species that result from atmospheric reactions. The sample collected on April 7, 2000 contains both genuine and reacted sea-salt particles. The genuine sea-salts are in the form of a mixture of NaCl and MgCl2 entrained during their passage over the Yellow Sea. The reacted sea-salts particles are encountered very much in fine fraction. The sample collected on March 22, 2001 shows somewhat significant chemical modification both for CaCO3 and sea-salts particles. For this sample, a significant number of reacted CaCO3 and sea-salt particles, such as those containing nitrate and/or sulfate, are encountered, implying that CaCO3 and sea-salts particles have reacted with sulfur or nitrogen oxide species during their long-range transport. The sample collected on May 17, 2001 experienced the most extensive chemical modification during its transport. In addition to the observation of the extensively reacted CaCO3 and sea-salt particles, reacted K2CO3 particles are also extensively encountered in this sample, which implies that K2CO3 species should be regarded as an additional important chemical species in the study of the chemical modification of Asian Dust particles during long-range transport.