This method is for determining total mercury in liquid hydrocarbons using a Nippon Instruments Corporation (NIC) Mercury Analyzer. The method may be applied to samples containing 0.1 to 10,000 ng/mL (m/v-ppb). The results can be converted to mass-ppb. The APPENDIX contains a procedure, Determination of Mercury Species in Hydrocarbons, which can be used to differentiate between elemental mercury, organic non-ionic mercury and ionic (both inorganic and organic) mercury species.