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首页> 外文期刊>Energy & fuels >Detection, Identification, and Quantification of Nonpolar High Molecular Weight Contaminants in Jet and Diesel Fuels by Liquid Chromatography
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Detection, Identification, and Quantification of Nonpolar High Molecular Weight Contaminants in Jet and Diesel Fuels by Liquid Chromatography

机译：液相色谱法检测，鉴定和量化喷气燃料和柴油燃料中的非极性高分子量污染物

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摘要

A straightforward analytical methodology has been developed for the identification and characterization of nonpolar high molecular weight contaminants, such as lubricant oils and greases, in jet and diesel fuels. Such contaminants typically contain a distribution of compounds with carbon numbers in the range C-25-C-40, or 350-600 Da, which are sufficiently larger than fuel constituents to be effectively detected via liquid chromatography. The methodology is based on high performance liquid chromatography, utilizing a xylenes-cyclohexane mobile phase gradient to separate these contaminants from fuels by means of dual porous graphite stationary phase columns and evaporative light scattering detection. The limits of detection for n-pentacosane, n-triacontane, n-pentatriacontane, and n-tetracontane were determined to be approximately 0.1 ppm, with an upper limit of 10% by volume. The newly developed methodology improves upon a previously developed methodology by both enhancing the resolution of high molecular weight contaminants from diesel fuels and eliminating the need for a chlorinated solvent while still minimizing gradient artifacts in the baseline. Uninformative variable elimination - partial least squares modeling was used to construct a comprehensive modeling framework trained with data collected from fuels with known contaminants, to characterize detected contaminants in at least a semiquantitative fashion. The overall methodology was successfully tested for use with various grades of jet and diesel fuel samples.
机译：已经开发出一种简单的分析方法，用于鉴定和表征喷气燃料和柴油燃料中的非极性高分子量污染物，例如润滑油和油脂。此类污染物通常包含碳数在C-25-C-40或350-600 Da范围内的化合物分布，其碳原子数大于燃料成分，可通过液相色谱法有效检测。该方法基于高效液相色谱，利用二甲苯-环己烷流动相梯度通过双多孔石墨固定相色谱柱和蒸发光散射检测将这些污染物从燃料中分离出来。确定正戊烷，正三烷，正戊烷和正丁烷的检出限约为0.1 ppm，上限为体积的10％。新开发的方法对先前开发的方法进行了改进，既提高了柴油燃料中高分子量污染物的分辨率，又消除了对氯化溶剂的需求，同时仍使基线中的梯度伪影最小化。无信息的变量消除-使用偏最小二乘建模来构建全面的建模框架，该框架使用从具有已知污染物的燃料中收集的数据进行训练，以至少半定量的方式表征检测到的污染物。总体方法已成功测试，可用于各种等级的喷气和柴油样品。

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  • 来源
    《Energy & fuels》 |2019年第2期|868-876|共9页
  • 作者

    Loegel Thomas N.; Cramer Jeffrey A.; Hammond Mark H.; Leska Iwona A.; Morris Robert E.; Johnson Kevin J.;

  • 作者单位

    Naval Res Lab, Code 6181,4555 Overlook Ave SW, Washington, DC 20375 USA;

    Naval Res Lab, Code 6181,4555 Overlook Ave SW, Washington, DC 20375 USA;

    Naval Res Lab, Code 6181,4555 Overlook Ave SW, Washington, DC 20375 USA;

    Nova Res Inc, 1900 Elkin St,Suite 230, Alexandria, VA 22308 USA;

    Nova Res Inc, 1900 Elkin St,Suite 230, Alexandria, VA 22308 USA;

    Naval Res Lab, Code 6181,4555 Overlook Ave SW, Washington, DC 20375 USA;

  • 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);
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