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Improved Method for Simultaneous Determination of Saturated and Aromatic Biomarkers, Organosulfur Compounds and Diamondoids in Crude Oils by GC-MS/MS
Organic Geochemistry ( IF 3 ) Pub Date : 2018-02-01 , DOI: 10.1016/j.orggeochem.2017.09.010
Mei Mei , K.K. (Adry) Bissada , Thomas B. Malloy , L. Mike Darnell , Ewa B. Szymcyk

Abstract An improved GC–MS/MS method was developed for simultaneous determination of various types of molecular markers in whole crudes without the need for laborious group-type separation and discrete analyses of the diverse fractions. The ability to simultaneously identify and accurately quantify the numerous saturated and aromatic biomarkers, the organosulfur compounds (OSC) and the diamondoids in a single step was attained through use of expanded multiple reaction monitoring (MRM) transitions in specific time windows. The optimization was achieved through improving GC separation and selective choice of precursor and product ions, collision energies, dwell time, and time windows in the MRM settings. The method was tested using four crude oils of diverse types, densities and maturities: a heavy crude from Sicily (18° API), an intermediate-density crude from the Arabian Gulf (33° API), a light black oil from California (39° API), and a light condensate from Wyoming (53° API). The improvements were validated by checking accuracy and precision using three spiking levels of standard compounds into the oils. Comparison of the results of the single-step GC–MS/MS method with the results from traditional multi-step approaches indicates that the single-step GC–MS/MS approach achieved higher resolution, higher specificity and sensitivity, higher accuracy and precision for calculation of the common biomarker indices. Additionally, the single-step approach precluded the loss of light-end components during sample preparation and minimized co-elution problems in molecular analyses.

中文翻译:

GC-MS/MS 同时测定原油中饱和和芳香族生物标志物、有机硫化合物和类金刚石的改进方法

摘要 开发了一种改进的 GC-MS/MS 方法,用于同时测定全原油中的各种类型的分子标记,而无需费力的组型分离和不同馏分的离散分析。通过在特定时间窗口中使用扩展的多反应监测 (MRM) 跃迁,能够在一个步骤中同时识别和准确量化众多饱和和芳香生物标志物、有机硫化合物 (OSC) 和类金刚石。优化是通过改进 GC 分离和选择性选择母离子和子离子、碰撞能量、停留时间和 MRM 设置中的时间窗口来实现的。该方法使用四种不同类型、密度和成熟度的原油进行测试:来自西西里岛的重质原油 (18° API),来自阿拉伯湾的中密度原油 (33° API)、来自加利福尼亚的轻质黑油 (39° API) 和来自怀俄明州的轻质凝析油 (53° API)。通过在油中使用三种加标水平的标准化合物来检查准确度和精密度,从而验证了这些改进。将单步 GC-MS/MS 方法的结果与传统多步方法的结果进行比较表明,单步 GC-MS/MS 方法实现了更高的分辨率、更高的特异性和灵敏度、更高的准确度和精密度计算常见的生物标志物指数。此外,一步法避免了样品制备过程中轻端组分的损失,并最大限度地减少了分子分析中的共洗脱问题。和来自怀俄明州的轻质冷凝物 (53° API)。通过在油中使用三种加标水平的标准化合物来检查准确度和精密度,从而验证了这些改进。将单步 GC-MS/MS 方法的结果与传统多步方法的结果进行比较表明,单步 GC-MS/MS 方法实现了更高的分辨率、更高的特异性和灵敏度、更高的准确度和精密度计算常见的生物标志物指数。此外,一步法避免了样品制备过程中轻端组分的损失,并最大限度地减少了分子分析中的共洗脱问题。和来自怀俄明州的轻质冷凝物 (53° API)。通过在油中使用三种加标水平的标准化合物来检查准确度和精密度,从而验证了这些改进。将单步 GC-MS/MS 方法的结果与传统多步方法的结果进行比较表明,单步 GC-MS/MS 方法实现了更高的分辨率、更高的特异性和灵敏度、更高的准确度和精密度计算常见的生物标志物指数。此外,一步法避免了样品制备过程中轻端组分的损失,并最大限度地减少了分子分析中的共洗脱问题。将单步 GC-MS/MS 方法的结果与传统多步方法的结果进行比较表明,单步 GC-MS/MS 方法实现了更高的分辨率、更高的特异性和灵敏度、更高的准确度和精密度计算常见的生物标志物指数。此外,一步法避免了样品制备过程中轻端组分的损失,并最大限度地减少了分子分析中的共洗脱问题。将单步 GC-MS/MS 方法的结果与传统多步方法的结果进行比较表明,单步 GC-MS/MS 方法实现了更高的分辨率、更高的特异性和灵敏度、更高的准确度和精密度计算常见的生物标志物指数。此外,一步法避免了样品制备过程中轻端组分的损失,并最大限度地减少了分子分析中的共洗脱问题。
更新日期:2018-02-01
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