Lower Resolution Infrared (IR) Spectroscopy Can Provide Higher Performance for Quantitative Biodiesel Measurements

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Resolution is often used as a yardstick of instrument performance in Infrared Spectroscopy.  This is especially true when the measurements are energy limited as they are in the mid-infrared.  For example, in both the European and ASTM standards - EN14078 and ASTM D7371 - for the determination of biodiesel in diesel fuel, a 4 cm-1 resolution is specified which is a relatively high resolution.  Resolution is important to qualitatively examine specific components and attributes of a sample, but quantitative analysis does not always benefit from higher resolution.  This has been pointed out in the past by Hart and Griffiths, a lower resolution instrument will actually perform better for quantitative measurements where absorbance peaks are well defined and not overlapping.  This White Paper demonstrates that lower resolution infrared spectroscopy can provide better performance biodiesel in diesel measurements.


 

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