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 Sulfur: 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

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.

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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.

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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.

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To comply with ASTM D4629, EST offers the NEXIS TN and combined instrument configurations like TN/TS with automatic liquids injection through the AS120 Liquids Autosampler configuration. The use of a boat inlet technique is recommended when analyzing high boiling point and viscous samples.