Determination of Vanadium, Nickel, and Iron in Crude Oil by High-Performance Liquid Chromatography

Published: Journal of Chromatographic Science, Volume 37, Number 9, October 1999, pp. 371-374

Determination of Vanadium, Nickel, and Iron in Crude Oil by High-Performance Liquid Chromatography
Fariba Tadayon, Ali Massoumi, and Mozaffar Eslami

A reversed-phase high-performance liquid chromatography method for the separation and simultaneous determination of vanadium, nickel, and iron is described. The chelates of the metal ions with 4-(2-pyridylazo)resorcinol are separated on a octadecyl-siloxane column with methanol and 0.01M (NH4)2HPO4–NH4H2PO4 (35:65, v/v) buffer (pH 6.5) as the mobile phase at a flow rate of 1.0 mL/min. The chelates are detected at 510 nm. The detection limits of vanadium, nickel, and iron are 0.9, 0.4, and 0.7 ng, respectively.

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