This method is for determining total mercury in liquidhydrocarbons using a Nippon Instruments Corporation (NIC) MercuryAnalyzer. The method may be applied to samples containing 0.1 to10,000 ng/mL (m/v-ppb). The results can be converted to mass-ppb.The APPENDIX contains a procedure, Determination of Mercury Speciesin Hydrocarbons, which can be used to differentiate betweenelemental mercury, organic non-ionic mercury and ionic (bothinorganic and organic) mercury species.