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首页> 外文期刊>Fuel >Direct determination of Cu and Fe in jet fuel by electrothermal atomic absorption spectrometry with injection of sample as detergent emulsions
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Direct determination of Cu and Fe in jet fuel by electrothermal atomic absorption spectrometry with injection of sample as detergent emulsions

机译：电热原子吸收光谱法直接测定喷气燃料中的铜和铁，样品作为洗涤剂乳液注入

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摘要

This paper reports the development of a method for the determination of copper and iron in jet fuels employing the electrothermal atomic absorption spectrometry (ETAAS). In order to allow the direct determination of the analytes, the samples were injected into the graphite furnace as detergent emulsions in order to avoid their volatilization during analysis. The results obtained in this work indicated that a stable emulsion can be formed by mixing 1 mL of a 7% m/v Triton X-100 solution containing 10% v/v HNO_3 with 4 mL of jet fuel. The injection of emulsions provided integrated absorbance signals with suitable sensitivity and precision for 300 min at least. The addition of chemical modifier was not necessary because background values were always very low, allowing the use of pyrolysis temperature around 1000 ℃ for both analytes. Both Triton X-100 and HNO_3 concentrations in the solution used to form the emulsion had remarkable influence on the sensitivity as well as the heating rate employed in the drying step. Under the best conditions established in the present work, limits of detection of 0.50 and 0.46 μg L~(-1) were observed for copper when oil-based and aqueous standards were added to the emulsions for calibration, respectively. For iron, the limits of detection were 0.88 and 0.90 μg L~(-1) for oil-based and aqueous standards, respectively. The method was applied in the determination of Cu and Fe in five samples of jet fuels and a recovery test was performed, producing recovery percentages between 95% and 105%.
机译：本文报道了利用电热原子吸收光谱法（ETAAS）测定喷气燃料中铜和铁的方法的发展。为了直接测定分析物，将样品作为去污剂乳液注入石墨炉中，以避免其在分析过程中挥发。在这项工作中获得的结果表明，可以通过将1 mL含10％v / v HNO_3的7％m / v Triton X-100溶液与4 mL喷气燃料混合来形成稳定的乳液。乳剂的注入至少在300分钟内提供具有适当灵敏度和精度的积分吸收信号。不需要添加化学改性剂，因为背景值总是很低，因此两种分析物都可以使用1000℃左右的热解温度。用于形成乳液的溶液中的Triton X-100和HNO_3浓度均对灵敏度以及干燥步骤中采用的加热速率有显着影响。在本研究确定的最佳条件下，当将油基和水性标准液分别添加到校准液中时，铜的检出限分别为0.50和0.46μgL〜（-1）。对于铁，油基和水性标准液的检出限分别为0.88和0.90μgL〜（-1）。该方法用于测定五种喷气燃料样品中的铜和铁，并进行了回收率测试，回收率在95％至105％之间。

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  • 来源
    《Fuel》 |2011年第3期|p.1215-1220|共6页
  • 作者

    Ricardo J. Cassella; Daniel M. Brum; Claudio F. Lima; Teresa Cristina O. Fonseca;

  • 作者单位

    Departamento de Quimica Analitica, Universidade Federal Fluminense. Outeiro de Saojoao Batista s. Centro, Niter6i/RJ 24020-141, Brazil;

    Departamento de Quimica, Universidade Federal de Vifosa, Av. Peter Henry Rolfs s. Vicosa/MC 36570-000, Brazil;

    Departamento de Quimica, Universidade Federal de Vifosa, Av. Peter Henry Rolfs s. Vicosa/MC 36570-000, Brazil;

    PETROBRAS, CENPE5. PDEDS/QM, Av. Horicio Macedo 950, Una do Funddo, Rio deJaneiro/RJ 21941-915, Brazil;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    jet fuel; electrothermal atomic absorption; spectrometry; copper; iron;

    机译：航空燃料;电热原子吸收;光谱法;铜;铁;

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