This method is for determining the concentrations of the metalsaluminum (Al), calcium (Ca), cobalt (Co), chromium (Cr), copper(Cu), iron (Fe), lead (Pb), lithium (Li), magnesium (Mg), manganese(Mn), molybdenum (Mo), nickel (Ni), palladium (Pd), phosphorus (P),platinum (Pt), potassium (K), sodium (Na), strontium (Sr), tin(Sn), titanium (Ti), vanadium (V), and zinc (Zn) in organicmatrices such as crude petroleum, asphalts, vacuum tower bottoms,vacuum gas oils, atmospheric gas oils, diesel and jet fuels andtheir blending components, and polymers, by Inductively CoupledPlasma � Optical Emission Spectrometry (ICP-OES). Most of theelements can be determined within the concentration range of 0.02to 200 mg/kg when a 50-g sample is ashed. Higher or lowerconcentrations can be determined by changing sample weight,dilution volume, and/or modifying the instrument operatingparameters. Determination of additional elements is possible ifthey are not volatilized during the ashing step. SeeNote.

Alternatively, some of the elements listed above may be analyzedby Atomic Absorption Spectroscopy (AAS). See UOP Method 391, "TraceMetals in Petroleum Products or Organics by AAS," for specificmetals and their range of quantitation.