This method is for determining nitrogen in liquid hydrocarbons at concentrations ranging from 50 to 300 ng/g (mass-ppb). This method is applicable to highly volatile samples, such as pentane, through the use of a cooled sampling system. Higher concentrations can be determined by ASTM Method D4629, quot;Trace Nitrogen in Liquid Petroleum Hydrocarbons by Syringe/Inlet Oxidative Combustion and Chemiluminescence Detection,quot; D6069, quot;Trace Nitrogen in Aromatic Hydrocarbons by Oxidative Combustion and Reduced Pressure Chemiluminescence Detection,quot; and D7184,quot;Ultra Low Nitrogen in Aromatic Hydrocarbons by Oxidative Combustion and Reduced Pressure Chemiluminescence Detection,quot; using the cooled sampling system described herein for highly volatile matrices. Halogens and sulfur interfere at concentrations greater than approximately 1%.
ASTM UOP981-10 history
2014ASTM UOP981-14 Trace Nitrogen in Liquid Hydrocarbons by Oxidative Combustion with Chemiluminescence Detection
2011ASTM UOP981-11 Trace Nitrogen in Liquid Hydrocarbons by Oxidative Combustion with Chemiluminescence Detection
2010ASTM UOP981-10 Trace Nitrogen in Liquid Hydrocarbons by Oxidative Combustion with Chemiluminescence Detection