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Petroleum fuels are generally non-polar. The presence of ethanol in the petrol–ethanol fuel blends increases the polarity of the fuel blend. It was observed that absorption spectral shift of the Reichardt's E T (30) dye is sensitive to the petrol–ethanol blend polarity. It was also found that E T (30) dye has a characteristic λ max of absorption in petrol–ethanol blends irrespective...
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