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首页> 外文期刊>Atmospheric environment >Ambient measurements of metal-containing PM_(2.5) in an urban environment using laser-induced breakdown spectroscopy
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Ambient measurements of metal-containing PM_(2.5) in an urban environment using laser-induced breakdown spectroscopy

机译：使用激光诱导击穿光谱法测量城市环境中含金属PM_（2.5）的环境

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Laser-induced breakdown spectroscopy (LIBS) was used to measure the distribution of seven species in individual ambient aerosol particles during an 8-day period from 26 August to 2 September 2002 at the Pittsburgh Aerosol Supersite. Particle hit rates were on the order of 10~(-4)-10~(-5) for Al, Ca, Cr, Cu, Mg, Mn, and Na. Weekly average concentrations between 29 and 720 ng m~(-3) are reported along with conservative threshold detection limits for individual particles between 15 and 184 fg, depending on the element. Hourly concentrations are reported for Ca, Mg, and Na; Mg concentrations are found to be somewhat correlated with both Ca and Na, while Ca and Na appear uncorrelated. A representative example of measured Mg particle masses illustrates that the detection threshold poses a limitation in this data set, which could be rectified in future implementations. Finally, the presence of multi-element particles in the data set suggest the use of high-sensitivity, wide-range echelle spectrometers for particle source apportionment and determination of associations between elements.
机译：在2002年8月26日至9月2日的8天时间内，使用激光诱导击穿光谱法（LIBS）在匹兹堡气溶胶超级站点测量了7种物质在单个环境气溶胶颗粒中的分布。 Al，Ca，Cr，Cu，Mg，Mn和Na的颗粒命中率约为10〜（-4）-10〜（-5）。根据元素的不同，每周平均浓度在29至720 ng m〜（-3）之间，并对单个粒子的保守阈值检测限在15至184 fg之间。每小时的钙，镁和钠浓度报告；发现镁的浓度与钙和钠都有些相关，而钙和钠似乎不相关。所测量的Mg颗粒质量的一个代表性示例说明，检测阈值对该数据集造成了限制，可以在将来的实现中纠正此限制。最后，数据集中存在多元素粒子提示使用高灵敏度，宽范围埃谢勒光谱仪进行粒子源分配和确定元素之间的缔合。

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