ASTM D4629:

Standard Test Method for Trace Nitrogen in Liquid Hydrocarbons by Syringe/Inlet Oxidative Combustion and Chemiluminescence Detection

Some process catalysts used in petroleum and chemical refining may be poisoned when even trace amounts of nitrogenous materials are contained in the feedstocks. This test method can be used to determine bound nitrogen in process feeds and may also be used to control nitrogen compounds in finished products.

Working range Total Nitrogen: 0.3 – 100 mg/kg
Boiling range: 25 – 400 °C
Viscosities of samples: 0.2 – 20 cSt (mm2/s) at room temperature
Sample types: Naphthas, Distillates, Oils

To comply with ASTM D4629, TSHR offers TN 6000 and TN 7000 series models and combined instrument configurations like TN/TS 6000 and TN/TS 7000 models with semi-automatic syringe or fully automatic liquids injection through HR 7000 models Liquids Autosampler configurations. The use of boat inlet technique at the TSHR 6000 models is recommended when analyzing high boiling point and viscous samples.