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首页> 外文期刊>Spectrochimica Acta, Part B. Atomic Spectroscopy >A FEASIBILITY STUDY OF THE USE OF ELECTROSTATIC DEPOSITION AND LASER-INDUCED FLUORESCENCE IN A GRAPHITE FURNACE FOR SIZE-SEGREGATED ANALYSIS OF LEAD AND GOLD IN ULTRAFINE 0.02-0.2 MU-M PARTICLES
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A FEASIBILITY STUDY OF THE USE OF ELECTROSTATIC DEPOSITION AND LASER-INDUCED FLUORESCENCE IN A GRAPHITE FURNACE FOR SIZE-SEGREGATED ANALYSIS OF LEAD AND GOLD IN ULTRAFINE 0.02-0.2 MU-M PARTICLES

机译:在石墨炉中使用静电沉积和激光诱导的荧光对0.02-0.2 MU-M超细颗粒中的铅和金进行大小分类分析的可行性研究

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摘要

The analytical feasibility has been studied of determining lead in size-segregated ultrafine aerosols by laser-induced fluorescence (LIF) after the transport and deposition, under the influence of an electric field, of the isomobility aerosol in a graphite furnace. After calibration with isomobility aerosols, the direct, size-segregated analysis of the lead content in a test aerosol in the 0.018-0.104 mu m diameter range was performed. Further, a brief study is presented of the dependence of the particle collection efficiency on the particle diameter. Total (polydisperse) lead concentrations in atmospheric ultrafine aerosols at the Ispra site were measured to be between 2.38 and 35.8 ng m(-3). The mass fraction, f(m), of lead in the unknown atmospheric particulate was calculated to be, on average, 4.81 x 10(-3). Results are also reported of initial studies of the analysis of gold in size-segregated aerosols and of problems associated with monodisperse calibration. Finally, with an achievable limit of detection, defined as the mass yielding a signal-to-noise ratio of 3, of 5 fe for lead and 3 fg for gold, estimates of the times required for the size-segregated analysis of their background levels in the above size range and in various atmospheric aerosols are presented. These range from several minutes for the case of lead in an urban aerosol to many days for gold in average background aerosols. (C) 1997 Elsevier Science B.V. [References: 65]
机译:已经研究了分析可行性,该方法是在电场的作用下,在石墨炉中通过等离子气溶胶的运输和沉积后,通过激光诱导荧光(LIF)测定尺寸分离的超细气溶胶中的铅。用等离子气溶胶校准后,对直径为0.018-0.104μm的测试气溶胶中的铅含量进行直接的,按大小分类的分析。此外,对颗粒收集效率对粒径的依赖性进行了简要研究。 Ispra站点的大气超细气溶胶中的总(多分散)铅浓度经测量为2.38至35.8 ng m(-3)。计算出的未知大气颗粒中铅的质量分数f(m)平均为4.81 x 10(-3)。还报告了对尺寸分离的气溶胶中金的分析以及与单分散校准有关的问题的初步研究结果。最后,通过可实现的检测极限(定义为产生3的信噪比,铅为5 fe,金为3 fg的质量),估算对其背景水平进行大小分离分析所需的时间提出了在上述尺寸范围内和各种大气中的气溶胶。对于城市气溶胶中的铅,这些时间范围从几分钟到平均背景气溶胶中的金,范围从几天不等。 (C)1997 Elsevier Science B.V. [参考:65]

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