Simultaneous determination of Cr, Fe, Ni and V in crude oil by emulsion sampling graphite furnace atomic absorption spectrometry

Anal. Methods, 2011, 3, 1280-1283

Simultaneous determination of Cr, Fe, Ni and V in crude oil by emulsion sampling graphite furnace atomic absorption spectrometry

Maciel Santos Luz and Pedro Vitoriano Oliveira

Abstract

Authors present a simple and reliable method for the simultaneous determination of Cr, Fe, Ni and V in crude oil, using emulsion sampling graphite furnace atomic absorption spectrometry.  Sample masses around 50 mg were weighed in polypropylene tubes and emulsified in a mixture of 0.5% hexane + 6% (m v⁻¹) Triton X-100^®.

Aliquots of 20 μL of reference solution and sample emulsion were co-injected into the graphite tube with 10 μL of 1.0 g L⁻¹ Mg(NO₃)₂ as chemical modifier.  Fuel oil Standard Reference Material (SRMTriton X-100^® 1634c – NIST) analysis was used to test the method’s reliability.  The concentrations found presented no statistical differences compared to the certified values at 95% confidence level.

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