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首页> 外文期刊>Environmental Science & Technology >The Impact of Particle Size, Relative Humidity, and Sulfur Dioxide on Iron Solubility in Simulated Atmospheric Marine Aerosols
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The Impact of Particle Size, Relative Humidity, and Sulfur Dioxide on Iron Solubility in Simulated Atmospheric Marine Aerosols

机译：粒径，相对湿度和二氧化硫对模拟大气海洋气溶胶中铁溶解度的影响

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摘要

Iron is a limiting nutrient in about half of the world's oceans, and its most significant source is atmospheric deposition. To understand the pathways of iron solubilization during atmospheric transport, we exposed size segregated simulated marine aerosols to 5 ppm sulfur dioxide at arid (23 ± 1% relative humidity, RH) and marine (98 ± 1% RH) conditions. Relative iron solubility increased as the particle size decreased for goethite and hematite, while for magnetite, the relative solubility was similar for all of the fine size fractions (2.5-0.25 μm) investigated but higher than the coarse size fraction (10-2.5 μm). Goethite and hematite showed increased solubility at arid RH, but no difference (p ＞ 0.05) was observed between the two humidity levels for magnetite. There was no correlation between iron solubility and exposure to SO_2 in any mineral for any size fraction. X-ray absorption near edge structure (XANES) measurements showed no change in iron speciation [Fe(Ⅱ) and Fe(Ⅲ)] in any minerals following SO_2 exposure. SEM-EDS measurements of SO_2-exposed goethite revealed small amounts of sulfur uptake on the samples; however, the incorporated sulfur did not affect iron solubility. Our results show that although sulfur is incorporated into particles via gas-phase processes, changes in iron solubility also depend on other species in the aerosol.
机译：铁是世界上约一半海洋中的一种限制性营养素，其最重要的来源是大气沉积。为了了解铁在大气中的溶解途径，我们在干旱（23±1％相对湿度，RH）和海洋（98±1％RH）条件下，将尺寸隔离的模拟海洋气溶胶暴露于5 ppm二氧化硫。针铁矿和赤铁矿的相对铁溶解度随粒径的减小而增加，而磁铁矿的相对溶解度在所研究的所有细粒度级分（2.5-0.25μm）均相似，但高于粗粒度级分（10-2.5μm） 。针铁矿和赤铁矿在干旱的相对湿度下显示出增加的溶解度，但是磁铁矿的两个湿度水平之间没有观察到差异（p＞ 0.05）。在任何大小分数的任何矿物中，铁的溶解度与SO_2的暴露量之间均无相关性。 X射线吸收近边缘结构（XANES）的测量结果表明，SO_2暴露后任何矿物中的铁形态[Fe（Ⅱ）和Fe（Ⅲ）]都没有变化。 SEM-EDS对暴露于SO_2的针铁矿的测量表明样品中有少量的硫吸收。但是，掺入的硫​​不会影响铁的溶解度。我们的结果表明，尽管硫通过气相过程掺入颗粒中，但铁溶解度的变化也取决于气溶胶中的其他物质。

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  • 来源
    《Environmental Science & Technology》 |2015年第12期|7179-7187|共9页
  • 作者

    Benton T. Cartledge; Aurelie R. Marcotte; Pierre Herckes; Ariel D. Anbar; Brian J. Majestic;

  • 作者单位

    Department of Chemistry and Biochemistry, University of Denver, Denver, Colorado 80208-9020, United States;

    Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287-1604, United States;

    Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287-1604, United States;

    Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287-1604, United States,School of Earth and Space Exploration, Arizona State University, Tempe, Arizona 85287-1404, United States;

    Department of Chemistry and Biochemistry, University of Denver, Denver, Colorado 80208-9020, United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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