The necessity of developing a small-sized mobile refractometer for express control of the state of hydrocarbon media and a new method for determining their composition and concentration of components in case the medium is a mixture of two hydrocarbon media is substantiated. This method will allow for comprehensive control of hydrocarbon media at the sampling site and making an informed decision on their intended use without additional studies in a stationary laboratory. This will save time and resources when solving many problems related to the use of fuel (for example, for mobile objects, etc.). The new method is characterized by the speed of measurements and does not require special sample preparation. The error in measuring the refractive index is ± 0.0002, which is sufficient for reliable express control. The studies of hydrocarbon media and their mixtures confirmed the adequacy of the development and the reliability of determining the composition of the hydrocarbon mixture and the concentration of components.
$^1$The Bonch-Bruevich Saint Petersburg State University of Telecommunications
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