This European Standard specifies a method for the determination of nickel and vanadium by atomic absorption spectrometry in liquid petroleum products with nickel and vanadium contents greater than 5 mg/ kg. NOTE: For the purposes of this European Standard, the term " % (m/ m)" is used to represent the mass fraction. WARNING: The use of this European Standard can involve hazardous materials, operations and equipment. This Standard does not purport to address all of the safety problems associated with its use.