Ethanol is now a common bio fuel additive for gasoline. The additional oxygen in ethanol provides for a cleaner burning fuel. The data presented demonstrates measurement of the ethanol content of fuel using near-infrared (NIR) spectroscopy. Guided Wave’s near-infrared dual beam photometer and near-infrared full scanning dual beam spectrometer make use of fiber optic technology to allow remote process monitoring for a large variety of applications. The determination of ethanol in fuels can be accurately and repeatably verified using both analyzers.
Feasibility Study: Measuring Ethanol Content of Gasoline using NIR Process Spectroscopy
A series of samples were prepared by adding known amounts of ethanol to a fuel sample covering the range of 0.1% to 22% added ethanol. Data for these standard samples was collected using a 10mm cuvette cell with both Guided Wave analyzers. The dual beam photometer was equipped with filters at 1140nm, 1300nm, 1410nm and 1445nm. The full near-infrared spectra of the standards are shown in Figure 1, along with an indication of filter locations (wavelengths selected) used in the dual beam photometer. Similar data for the photometer is shown in Figure 2.