Determination of Nickel and Vanadium in Oil By Inductively Coupled Plasma-Atomic Emission Spectrometry With Microemulsion Sample Introduction.

Abstract

The introduction of oils into an inductively coupled plasma spectrometer is carried out after the formation of oil-in-water microemulsions. These organic-aqueous solutions are tolerated by the spectrometer while working at 1 Kw of power and with 20 1.min⁻¹ Ar plasma gas flow. In these conditions the emission intensity of emulsions of nickel and vanadium at 221.64 nm and 292.40 nm, respectively, can be interpolated in aqueous calibration graphs of the elements. The method has been evaluated using three synthetic samples prepared from base oil spiked with Ni and V. Detection limits of Ni and V in oils of 1.25 and 0.94 μg.⁻¹, respectively, are found.

Key Words:

• Nickel
• Vanadium
• Oil
• Microemulsion
• Inductively Coupled Plasma
• Atomic Emission Spectrometry.