ASTM D4629:

ASTM D4629 is the 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. ASTM D4629 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 Total Nitrogen analyzers NEXIS, NEXIS VP and 6000/7000 series models and combined instrument configurations like TN/TS models with semi-automatic syringe or fully automatic liquids injection through AS120 and HR 7000 models Liquids Autosampler configurations. The use of boat inlet technique at the TSHR NEXIS and 6000 models is recommended when analyzing high boiling point and viscous samples.

Nitrogen compounds can have detrimental effects on many environmental and industrial processes and are undesirable in finished products. This support the need and importance to monitor low level nitrogen concentration of various type of automotive fuels and related products. This Application Note shows the of the NEXIS VP model Total Nitrogen Analyzer for a set of gasoline and diesel fuel samples based on a 21-days trial to determine the precision of the nitrogen data in compliance to ASTM D4629 and DIN 51444 methods.

Learn More >>

ASTM D4629 covers the determination of Total Nitrogen in concentrations ranging from about 0.3 to 100 mg/kg in liquid petroleum products having a boiling point range of 50˚C to 400˚C and viscosities between 0.2 and 10 mm²/s at ambient temperature. The ASTM D4629 standard is the preferred method in many countries to detect
and quantify total bounded nitrogen containing compounds in the various type of automotive fuels such as blended gasolines, diesel and synthetic oils.

Nitrogen compounds can have detrimental effects on many environmental and industrial processes and are undesirable in finished products. This supports the need and importance to monitor trace level nitrogen concentration of various type of automotive fuels and related products. This application note shows the total bounded nitrogen analysis performance of a set of liquid hydrocarbon samples, by the EST NEXIS Total Nitrogen analyzer.

>> Learn More

Vacuum Gas Oils (VGOs) are the heavy oils left after petroleum distillation. VGOs have a viscous matrix and high boiling points. The EST Analytical TN 7000 has an injection port designed to maintain the injection port temperature at 500°C, while the autosampler tray can be fitted with a heater. These features aid in making the TN 7000 ideal for the examination of Total Nitrogen in VGO samples.

Learn More >>