ASTM D4629

ASTM D4629 is the ASTM standard for measuring trace nitrogen in liquid hydrocarbons by syringe/inlet oxidative combustion and chemiluminescence detection. It provides a focused analytical approach for determining very low nitrogen levels in liquid hydrocarbon samples, helping support quality control and material evaluation where nitrogen content may affect performance or downstream processing. As an ASTM standard, it gives laboratories and buyers a common technical reference for consistent testing and reporting.

ASTM D4629 standard overview

The official title of ASTM D4629 identifies a test method centered on trace nitrogen analysis in liquid hydrocarbons. It uses oxidative combustion with chemiluminescence detection, which is widely associated with sensitive elemental measurement. In product and laboratory settings, this standard helps define a repeatable way to assess nitrogen content using syringe/inlet introduction of the sample. That makes it useful for organizations that need a recognized method for analytical consistency, procurement checks, or compliance-related testing.

Where is ASTM D4629 used?

ASTM D4629 is commonly used in laboratories that test liquid hydrocarbons and related petroleum-derived materials where trace nitrogen levels are of interest. It is a practical reference for analytical workflows involving sample injection, combustion-based detection, and low-level elemental measurement. The standard may support routine quality control, incoming material verification, product release testing, and comparative evaluation of hydrocarbon samples. It is especially relevant when a defined test method is needed for consistent nitrogen determination.

Practical importance of ASTM D4629

ASTM D4629 matters because trace nitrogen results can influence how liquid hydrocarbons are evaluated, compared, and accepted. A standardized method helps reduce variability between laboratories and improves confidence in test data used for procurement, specification checks, and internal quality programs. For buyers and test labs, ASTM D4629 offers a recognized basis for consistent measurement, which can support better decision-making, lower risk of disagreement, and clearer technical communication across the supply chain.

• Trace nitrogen determination in liquid hydrocarbons
• Syringe/inlet oxidative combustion method
• Chemiluminescence detection-based analysis
• Laboratory consistency and reporting
• Quality control and specification support