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Organic sulfur compounds are natural components of crude oil. The presence of these compounds is undesirable, as they cause corrosion of equipment and contaminate the atmosphere during combustion. Sulfur compounds ruin expensive catalysts and release sulfur oxides into the atmosphere when burned, thereby creating environmental problems. Therefore, modern methods are needed to detect, identify and measure the concentrations of sulfur contents, water, and other elements in petroleum products. This work proposed a method for the quantitative analysis of petroleum and petroleum waste, including refinery sludges, based on the coulometry method The present article describes the methods to determine the total amount of sulfur in the waste oil and the number of hydrocarbons in the viscous oil wastes. Additionally, Karl- Fischer method was adapted to measure the content of water in crude oil. In our work reported here, a titration coulometric reagent administration and potentiometric detection using ion-selective electrodes has been worked out and applied for the determination of sulfur and water concentration in crude oil samples.

New coulometeric method for determination of the chemical compositions of refinery waste