This potentiometric method is for determining total and inorganic chloride, and calculating organic chloride, in hydrocarbons. The method is applicable to samples with chloride concentrations of 1 mass-ppm or higher. For lower levels of chloride use UOP Method 991 “,Chloride, Fluoride, and Bromide in Liquid Organics by Combustion Ion Chromatography (CIC).”, Iodide and/or bromide, if present, are calculated as chloride. Samples that are polymerized by sodium biphenyl (such as styrene) cannot be analyzed by this method. Results for samples containing ammonia and/or amines may be biased high (see Note 1).