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首页> 外文期刊>Atmospheric environment >Are coarse particles unexpected common reservoirs for some atmospheric anthropogenic trace elements? A case study
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Are coarse particles unexpected common reservoirs for some atmospheric anthropogenic trace elements? A case study

机译：对于某些人为大气微量元素，粗颗粒是否是意外的常见储层？案例研究

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摘要

Without specific experimental equipment, it is very difficult to sample long-term atmospheric deposits on a pure state. That is why the composition of air-transferred solid material accumulated for 40 years in the 2 m-high walls, pierced with numerous holes of an outdoor public shelter, Grenoble city, France, was studied. An appropriate fractionation procedure allowed to obtain several fractions which were i) a sand fraction (8.3%) (fraction A), ii) a large mass of organic matter corresponding mostly to large fragments (>250 urn) of plant origin (66.7%) (fraction B) or to pollen fraction C (0.4%), iii) a slowly depositing organo-clay fraction (20%) (fractions D_1 and D_2) and iv) a solution mixed with non-settable particles (4.3%) (fraction E). The composition of each fraction was determined for 20 elements. The sand fraction showed very high concentrations specifically in Cu, Pb and Fe corresponding respectively to 81.5, 48.2 and 35.2% of the samples content in these elements. In contrast, Cd and Zn were mainly accumulated in the fraction B (67.5 and 62.2%, respectively). The scanning electron microscopy coupled to energy dispersive X-ray analysis (SEM-EDX) study of the fraction A showed the presence of large particles bearing Pb and Fe, particles rich in Cu and typical fly ashes originating mostly from iron industry. Most of these particles had a crystalline shape suggesting that they were formed after emission at a high temperature. The Pb-Fe-Cu deposit seen in fraction A likely originates from the neighbouring road surface contaminated by car traffic for several decades. The ~(26)Pb/~(207)Pb ratio (1.146 ± 0.004) showed that in the coarse sandy fraction A, Pb was represented at 65% by non-gasoline lead and 35% by "gasoline" lead emitted before 1999. The fraction A particles can only be transported on a limited distance by high magnitude events. They constitute a large reservoir for Cu and Pb and may play a major role in the long-term contamination of urban soils.
机译：没有特定的实验设备，很难以纯净状态对长期的大气沉积物进行采样。这就是为什么研究了在法国格勒诺布尔市一个2 m高的墙壁中被空气传播的固体物质的成分积累了40年的现象，这些墙壁被许多公共室外庇护所的孔刺穿了。适当的分馏程序可得到以下几部分：i）砂部分（8.3％）（部分A），ii）大量有机物，大部分对应于植物来源的大碎片（> 250 urn）（66.7％） （部分B）或花粉部分C（0.4％），iii）缓慢沉积的有机粘土部分（20％）（部分D_1和D_2），和iv）与不可固化颗粒（4.3％）混合的溶液（部分E）。确定每个部分的组成为20个元素。砂分显示出非常高的浓度，特别是在Cu，Pb和Fe中，分别相当于这些元素中样品含量的81.5、48.2和35.2％。相比之下，Cd和Zn主要积累在组分B中（分别为67.5％和62.2％）。扫描电子显微镜结合馏分A的能量色散X射线分析（SEM-EDX）研究表明，存在带有Pb和Fe的大颗粒，富含Cu的颗粒和典型的飞灰，这些飞灰主要来自钢铁工业。这些颗粒大多数具有晶体形状，表明它们是在高温下发射后形成的。在馏分A中看到的Pb-Fe-Cu沉积物可能源自几十年来受到汽车交通污染的相邻路面。 〜（26）Pb /〜（207）Pb比率（1.146±0.004）表明，在粗砂质组分A中，Pb占非汽油铅的65％，由1999年前排放的“汽油”铅的35％。分数A粒子只能通过高强度事件在有限的距离内传输。它们构成了铜和铅的大型储集层，并可能在城市土壤的长期污染中发挥重要作用。

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  • 来源
    《Atmospheric environment》 |2013年第8期|217-226|共10页
  • 作者

    Mickael Catinon; Sophie Ayrault; Omar Boudouma; Louise Bordier; Gregory Agnello; Stephane Reynaud; Michel Tissut;

  • 作者单位

    Laboratoire LECA, UMR 5553, Equipe Pollution, Environnement, Ecotoxkologie et Ecoremediation, Univ.J. Fourier, 38041 Grenoble, France;

    Laboratoire des Sciences du Climat et de l'Environnement, UMR 8212, CEA-CNRS-UVSQ/IPSL, 91198 Gif-sur-Yvette, France;

    Service du MEB, UFR928, Universite Pierre et Marie Curie, 75252 Paris VI, France;

    Laboratoire des Sciences du Climat et de l'Environnement, UMR 8212, CEA-CNRS-UVSQ/IPSL, 91198 Gif-sur-Yvette, France;

    Evinrude, Espace St Germain, 38200 Vienne, France;

    Laboratoire LECA, UMR 5553, Equipe Pollution, Environnement, Ecotoxkologie et Ecoremediation, Univ.J. Fourier, 38041 Grenoble, France;

    Laboratoire LECA, UMR 5553, Equipe Pollution, Environnement, Ecotoxkologie et Ecoremediation, Univ.J. Fourier, 38041 Grenoble, France;

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  • 正文语种 eng
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  • 关键词

    Air pollution; Pb isotopes; Urban; Coarse particles; SEM-EDX; ICP-MS;

    机译：空气污染;铅同位素;城市粗颗粒;扫描电镜ICP-MS;

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