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Iron speciation in urban dust

机译：城市尘埃中的铁形态

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摘要

An improved understanding of anthropogenic impacts on ocean fertility requires knowledge of anthropogenic dust mineralogy and associated Fe speciation as a critical step toward developing Fe solubility models constrained by mineralogical composition. This study explored the utility of micro-focused X-ray absorption spectroscopy (μ-XAS) in characterizing the speciation of Fe in urban dust samples. A microfocused beam of 10 x 7 urn made possible the measurement of the Fe Kedge XAS spectra of individual dust particles in the PM5.6 size fraction collected in Newark, New Jersey, USA. Spectral analysis indicated the presence of mixtures of Fe-containing minerals within individual dust particles; we observed significant magnetite content along with other Fe(Ⅲ)-(hydr)oxide minerals which could not be conclusively identified. Our data indicate that detailed quantitative determination of Fe speciation requires extended energy scans to constrain the types and relative abundance of Fe species present. We observe heterogeneity in Fe speciation at the dust particle level, which underscores the importance of analyzing a statistically adequate number of particles within each dust sample. Where possible, μ-XAS measurements should be complemented with additional characterization techniques such as μ-XRD and bulk XAS to obtain a comprehensive picture of the Fe speciation in dust materials. X-ray microprobes should be used to complement bulk methods used to determine particle composition, methods that fail to record particle heterogeneity.
机译：要更好地了解人为对海洋肥力的影响，需要了解人为扬尘矿物学和相关的铁形态，这是开发受矿物成分约束的铁溶解度模型的关键步骤。这项研究探索了微聚焦X射线吸收光谱法（μ-XAS）在表征城市尘埃样品中铁的形态方面的实用性。 10 x 7微米的微聚焦光束使测量美国纽约州纽瓦克市PM5.6粒度级分中单个尘埃颗粒的Fe Kedge XAS光谱成为可能。光谱分析表明在单个尘埃颗粒中存在含铁矿物的混合物。我们观察到大量磁铁矿以及其他无法确定的Fe（Ⅲ）-（hydr）oxide矿物。我们的数据表明，对铁形态的详细定量测定需要扩展能量扫描，以限制当前所存在铁物种的类型和相对丰度。我们在尘埃颗粒水平观察到铁形态的异质性，这突出了分析每个尘埃样品中统计上足够数量的颗粒的重要性。在可能的情况下，应使用其他表征技术（例如，μ-XRD和块状XAS）对μ-XAS测量进行补充，以获得粉尘材料中铁形态的全面图像。 X射线微探针应用于补充用于确定颗粒组成的大量方法，这些方法无法记录颗粒异质性。

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  • 来源
    《Atmospheric environment》 |2011年第26期|p.4528-4532|共5页
  • 作者

    Evert J. Elzinga; Yuan Gao; Jeffrey P. Fitts; RyanTappero;

  • 作者单位

    Rutgers University, Department of Earth & Environmental Sciences, 101 Warren Street, Newark, NJ 07102, USA;

    Rutgers University, Department of Earth & Environmental Sciences, 101 Warren Street, Newark, NJ 07102, USA;

    Environmental Sciences Department, Brookhaven National laboratory, Upton, NY 11973-5000, USA;

    National Synchrotron Light Source, Brookhaven National Laboratory, Upton, NY 11973-5000, USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    urban dust; iron; speciation; micro-focused x-ray absorption; spectroscopy;

    机译：城市尘埃;铁;形态;微聚焦X射线吸收;光谱学;

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