1.1 This standard is intended to indicate the high temperature method for determining total sulfur in petroleum products, including lubricating oils with additives and additive concentrates. It is applicable to samples whose boiling point is higher than 177 °C, containing an amount of sulfur of not less than 0.06%. Chlorides do not interfere at concentrations less than 1%. Nitrogen can interfere at concentrations greater than 0.1%; The degree of interference may depend on the type of nitrogen compounds as well as the combustion conditions. Alkali or alkaline earth metals do not interfere, nor do zinc, phosphorus, or lead. 1.2 Petroleum coke containing up to 8% sulfur can be analyzed.