Quantification of ethanol in petrol-ethanol blends: Use of Reichardt's ET(30) dye in introducing a petrol batch independent calibration procedure

► Petrol batch independent ethanol quantification in petrol-ethanol blends was achieved. ► Reichardt's ET(30) dye was found to have characteristic absorbance λmax in petrol-ethanol blends. ► 2nd order polynomial was found to be optimum to explain the transition energy of ET(30) with ethanol concentration. ► Calibration model can be used for the quantification of ethanol in the concentration range of 2% to 30%. ► Statistical parameters show that obtained calibration model is robust.