An attempt was made to determine the charging characteristics of oxide particles suspended in a liquid Hg at room temperature. The pure liquid Hg and the liquid Hg containing oxide particles were respectively chosen as a reference electrode and a sample electrode for the potential measurement. Experimental results show that oxides carry the positive charge by providing electrons to the liquid Hg regardless of the nature of oxides i.e. n-type ZnO, Al₂O₃ or p-type NiO. It is also interesting to note that the potential was slightly increased with increasing the purity of Al₂O₃ and also was increased with increasing amount of Al₂O₃ added to the liquid Hg. The highest potential obtained was 4.5 μN for 5g of Al₂O₃.