Characterization of atmospheric aerosols using Synchroton radiation total reflection X-ray fluorescence and Fe K-edge total reflection X-ray fluorescence-X-ray absorption near-edge structure
Characterization of atmospheric aerosols using Synchroton radiation total reflection X-ray fluorescence and Fe K-edge total reflection X-ray fluorescence-X-ray absorption near-edge structure
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DOI：
10.1016/j.sab.2008.10.016
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发表时间：
2008-12-01
影响因子：
3.3
通讯作者：
Pepponi, G.
中科院分区：
文献类型：
--
作者：
Fittschen, U. E. A.;Meirer, F.;Pepponi, G.
在这项研究中，提出了一种新的程序，使用同步加速器全反射x射线荧光（SR-TXRF）来表征大气气溶胶中的元素量，小到粒径为0.015微米。该程序对反弹效果和空白值进行了彻底的评估。此外，全反射x射线荧光- x射线吸收近边结构（SR-TXRF-XANES）在收集1小时的气溶胶中形成的FeII/III的量降至34 pg。这些气溶胶是在汉堡市用低压伯纳撞击器收集的，它们分别在60分钟和20分钟的时间内被硅树脂覆盖的硅载体上。分别以10.0 ~ 8.0 μ m、8.0 ~ 2.0 μ m、2.0 ~ 0.13 μ m、0.13 ~ 0.015 μ m（空气动力学粒径）和15 ~ 30 nm、30 ~ 60 nm、60 ~ 130 nm、130 ~ 250 nm、250500 nm、0.5 ~ 1 μ m、1 ~ 2 μ m、2 ~ 4 μ m、4 ~ 8 μ m、8 ~ 16 μ m为4个和10个粒径段收集颗粒。在取样前，利用全反射x射线荧光研究了硅酮和凡士林包覆硅载体的“反弹”效应。根据实验结果，选择了有机硅涂层载体进行分析。此外，研究了来自采样装置和校准程序的空白水平。空白的铁含量相当于气溶胶样品中铁的1-10%。内部标准产生的空白水平被发现可以忽略不计。对气溶胶进行同步辐射全反射x射线荧光分析的结果表明，20分钟的采样时间仍然足够进行大多数元素的元素测定。为了测定气溶胶中铁的氧化态，从异丙醇悬浮液中制备了不同的铁盐作为参考。气溶胶样品的铁k边同步辐射全反射x射线荧光- x射线吸收近边结构分析结果表明，各粒径组分中主要存在铁（III）。(C) 2008 Elsevier B.V.版权所有
In this study a new procedure using Synchrotron total reflection X-ray fluorescence (SR-TXRF) to characterize elemental amounts in atmospheric aerosols down to particle sizes of 0.015 um is presented. The procedure was thoroughly evaluated regarding bounce off effects and blank values. Additionally the potential of total reflection X-ray fluorescence-X-ray absorption near edge structure (SR-TXRF-XANES) for speciation of FeII/III down to amounts of 34 pg in aerosols which were collected for 1 h is shown. The aerosols were collected in the city of Hamburg with a low pressure Berner impactor on Si carriers covered with silicone over time periods of 60 and 20 min each. The particles were collected in four and ten size fractions of 10.0-8.0 mu m, 8.0-2.0 mu m, 2.0-0.13 mu m 0.13-0.015 mu m (aerodynamic particle size) and 15-30 nm, 30-60 nm, 60-130 nm, 130-250 nm, 250500 nm. 0.5-1 mu m, 1-2 mu m, 2-4 mu m, 4-8 mu m, 8-16 mu m. Prior to the sampling "bounce off" effects on Silicone and Vaseline coated Si carriers were studied with total reflection X-ray fluorescence. According to the results silicone coated carriers were chosen for the analysis. Additionally, blank levels originating from the sampling device and the calibration procedure were studied. Blank levels of Fe corresponded to 1-10% of Fe in the aerosol samples. Blank levels stemming from the internal standard were found to be negligible.The results from the Synchroton radiation total reflection X-ray fluorescence analysis of the aerosols showed that 20 min of sampling time gave still enough sample material for elemental determination of most elements. For the determination of the oxidation state of Fe in the aerosols different Fe salts were prepared as a reference from suspensions in isopropanol. The results from the Fe K-edge Synchroton radiation total reflection X-ray fluorescence-X-ray absorption near-edge structure analysis of the aerosol samples showed that mainly Fe(III) was present in all particle size fractions. (C) 2008 Elsevier B.V. All rights reserved.