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Estimating partition coefficients of tracers in oil-water systems

Grigoriadou Anastasia

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Summary

In this study, partition coefficients of three light alcohols (methanol, ethanol, 2-propanol) were experimentally determined in binary systems consisting of an aqueous phase and an oil phase. The oil phase was hexane, heptane, toluene, xylene and carbon tetrachloride. These solvents were used to simulate the behavior of alcohols, polar phases and non-aqueous phase liquids (NAPL) during leakage of organic mixtures or oil. The knowledge of the partition coefficient is important to simulate the leakage of organic pollutants into environment.Also, components such as these alcohols are used in studies to calculate the residual concentration of water or oil in hydrocarbon reservoirs, such as Single Well Tracer Test (SWTT) or Double Well Tracer Test (DWTT). The determination of partition coefficients of alcohols was made by calculating their concentration in the aqueous phase. For the determination of these concentrations, gas chromatography was used (with a flame ionization detector (FID)) with three different sample injection methods. Direct injection, Headspace sampling and Solid Phase Microextraction (SPME). Based on the experimental results, Headspace sampling has been shown to result in lower detectionand quantification limits of the three alcohols in water. The values of the partitioncoefficients for the alcohols in the aqueous-oil phase systems were found inagreement with corresponding bibliographic data.

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