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Crude oil samples contain several types of contaminants including metalorganic compounds, sulfur containing compounds and sediments. Energy dispersive X-ray fluorescence spectrometry was used for the direct determination of S, Ca, Fe, Ni and V in crude oils, enabling a fast and reliable method that avoids complex sample preparation. Crude oil samples were homogenized and 20μL of a diluted sample (1/1...
Chlorine determination in crude oil is made in order to guarantee that the oil does not contain levels of this element that might cause damages in the oil processing equipment. In petroleum products, the determination of chlorine is made, for instance, to evaluate if there are proper concentrations of organochloride compounds, which are used as additives. Such determinations are currently performed...
The solids formed in the systems containing copper in different oxidation states, in the presence and absence of hexanoic acid and dodecanethiol, together and separately, at room temperature, were studied. The experiments were performed in a mineral oil matrix, free of sulfur compounds and metals; a diesel oil matrix; and the reagents alone, without any matrix. The deposits formed were analyzed by...
In this study, the reactivity of metal ions that exist in fuel oil with some ligands present either in sea water (inorganic ligands) or in fuel oil (mercaptans and organic acids) were compared based on their formation constants. The values of the formation constants of the metals with the main ligands in water are known. The complexation of the metals Ni(II), V(IV), Fe(II), Cd(II) and Pb(II) with...
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