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Soil contamination often causes irreversible environmental degradation, such as death of plants, small animals and soil micro-organisms, as well as groundwater pollution. Some of the most environmentally degrading pollutants are petroleum-based ubstances, such as used engine oil. These pollutants are often the consequence of negligence, such as leaky lubrication systems in agricultural machinery, improper storage or even deliberate dumping
of used engine oil in the soil. Engine oil has a high viscosity index and therefore adheres strongly to soil particles. Moreover, it takes tens or even hundreds of years to decompose and remains in the soil for a very long time, causing soil depletion. It is important to be able to detect even small amounts of such contaminants in soil. In this work, the possibility of detecting soil contamination by engine oil was tested using three different dielectric probes connected to a vector network analyzer. Sand containing several different levels of 15W40 motor oil contamination was used in the measurements.
