DS EN 15944:2010 Liquid Petroleum Products - Determination Of Nickel And Vanadium Content - Inductively Coupled Plasma Optical Emission Spectrometry Method (Icp Oes) Defines an inductively coupled plasma optical emission spectrometry (ICP OES) method for the determination of nickel content in the range 4 mg/kg to 55 mg/kg and of vanadium content in the range 4 mg/