Determination of Vanadium in Heavy Oils by Atomic Absorption Spectrometry Using a Graphite Furnace Coated with Tungsten

Abstract

A simple and rapid method was established for the direct determination of vanadium in an oil sample using the tungstencoated graphite-furnace AAS. The interference of the sulfur compound could be suppressed by choosing the ashing temperature. If the sulfur concentration in the sample is diluted to 1.0 wt% or less, the interference can be suppressed. This proposed method should make important contributions to the quality control of petroleum refineries.

Determination of Metal Ions in Crude Oils

“…Finally they used mixture of toluene and acetic acid 4:1 v/v as a solvent for dissolution of the samples. Nakamoto et al (2004) determined V in heavy fuel oils www.intechopen.com using tungsten coated graphite furnace. The effect of sulphur interference on the determination was examined.…”

Analyse de métaux traces dans les produits pétroliers, état de l'art

“…Plus classiquement, le dosage du vanadium dans les produits lourds est entrepris par Nakamoto et al (2004) qui couvre ses tubes en graphite avec une solution de tungstène permettant de rallonger la vie des tubes et d'excéder les 200 injections. Aucune limite de quantification n'est donnée dans cet article et seule une validation de la méthode par un dosage de produit contenant entre 2 et 140 mg/kg est proposée.…”

Evaluation of modifiers for determination of V in parsley by GF AAS

“…The main advantage of this modifier was the pronounced increase on vanadium sensitivity due to the formation of volatile compounds between vanadium and fluoride. Permanent chemical modifiers have also been investigated for the determination of vanadium in different samples (Meeravali & Kumar, 2001;Nakamoto, Ishimaru, Endo, & Matsusaki, 2004;Thomaidis & Piperaki, 1996). Tungsten and Rh were applied as permanent modifiers for the determination of vanadium in heavy oils (Nakamoto et al, 2004) and in oils and water (Thomaidis & Piperaki, 1996), respectively.…”

“…Permanent chemical modifiers have also been investigated for the determination of vanadium in different samples (Meeravali & Kumar, 2001;Nakamoto, Ishimaru, Endo, & Matsusaki, 2004;Thomaidis & Piperaki, 1996). Tungsten and Rh were applied as permanent modifiers for the determination of vanadium in heavy oils (Nakamoto et al, 2004) and in oils and water (Thomaidis & Piperaki, 1996), respectively. The W-coated tube increased the graphite tube lifetime in firings compared with other tested modifiers and precise results were obtained using an oil standard reference material.…”