ASTM D5622-24 PDF

Full title and description

Standard Test Methods for Determination of Total Oxygen in Gasoline and Methanol Fuels by Reductive Pyrolysis — Test methods that describe procedures for quantitatively determining total oxygen content in gasoline and methanol fuels using a reductive pyrolysis approach; intended for use in fuel quality control, regulatory compliance and laboratory analysis.

Abstract

This standard (D5622-24) specifies test methods for the quantitative determination of total oxygen in gasoline and methanol fuels by reductive pyrolysis. It provides precision data over practical concentration ranges (approximately 1.0–5.0 % oxygen by mass for gasoline and 40–50 % oxygen by mass for methanol fuels), describes suitable instrumental approaches (multiple detector types may be used after pyrolysis in a carbon-rich environment), and notes that the method complements compound-specific methods such as Test Method D4815. The standard is written using SI units and includes safety and laboratory-practice notes.

General information

• Status: Active.
• Publication date: D5622-24 — published/updated in 2024 (current ASTM listing shows May 2024 as the 2024 edition).
• Publisher: ASTM International.
• ICS / categories: 75.160.20 (Liquid fuels / petroleum products).
• Edition / version: D5622-24 (2024 edition; current active edition).
• Number of pages: 5 pages.

Scope

These test methods cover the quantitative determination of total oxygen in gasoline and methanol fuels by reductive pyrolysis. The procedure involves pyrolyzing the fuel in a carbon-rich environment and detecting the oxygen-derived species (instrument-specific detection and quantitation approaches are allowed). Precision statements and applicable concentration ranges are provided for typical gasoline and methanol blends; the standard clarifies units and safety responsibilities for users. The method is intended to complement compound-specific analyses (for example, methods that measure individual oxygenates by GC) rather than to replace them.

Key topics and requirements

• Reductive pyrolysis-based analytical procedure for total oxygen determination.
• Quantitative reporting in mass percent (SI units) and stated precision ranges (≈1.0–5.0 % for gasoline; ≈40–50 % for methanol fuels in the provided precision data).
• Guidance that several instrument types/detectors may be used provided the sample is pyrolyzed in a carbon-rich environment and response is properly calibrated.
• Notes on method applicability and limitations (interferences, need for matrix considerations or dilution at high oxygen levels, and safety precautions).
• Relationship to compound-specific oxygenate test methods (used as a complement to methods such as D4815 for individual oxygenates).

Typical use and users

Used by petroleum and fuel testing laboratories, refineries, fuel blenders, regulatory and environmental agencies, and R&D groups to determine total oxygen content for quality control, specification compliance, fuel formulation and regulatory reporting. Laboratories that already use chromatographic or combustion-based oxygen/heteroatom analysis will find the method applicable as a complementary or confirmatory procedure.

Related standards

Standards commonly referenced alongside D5622 include: - ASTM D4815 (test method for many individual ethers and C1–C4 alcohols in gasoline by GC — complementary compound-specific oxygenate analysis). - ASTM D4814 (automotive spark-ignition engine fuel specification — relates to fuel composition and regulatory requirements where oxygenate content is relevant). - ASTM D6259 (practice for determination of a pooled limit of quantitation — referenced for LOQ/PLOQ assessments used in interlaboratory precision statements).

Keywords

total oxygen; reductive pyrolysis; gasoline; methanol; oxygenates; ethanol; MTBE; fuel analysis; PLOQ; precision; ASTM D5622-24.

FAQ

Q: What is this standard?

A: ASTM D5622-24 is the ASTM test method titled "Standard Test Methods for Determination of Total Oxygen in Gasoline and Methanol Fuels by Reductive Pyrolysis," which specifies laboratory procedures to quantify total oxygen in those fuels.

Q: What does it cover?

A: It covers the reductive pyrolysis technique for converting oxygen-containing species to measurable products, detection and quantitation approaches (instrument-specific), precision data for typical concentration ranges, units (SI), and guidance on applicability and safety. The method complements compound-specific methods for individual oxygenates.

Q: Who typically uses it?

A: Fuel testing and quality control laboratories, refineries, fuel blenders, regulatory agencies, and research laboratories involved in petroleum and fuel analysis.

Q: Is it current or superseded?

A: D5622-24 is the 2024 edition and is listed as the active/current edition (the 2024 revision supersedes prior editions). Users should consult ASTM for the absolute latest edition or any amendments.

Q: Is it part of a series?

A: It is maintained under ASTM Committee D02 (Petroleum Products, Liquid Fuels, and Lubricants) and appears in the ASTM annual Book of Standards (volume covering liquid fuels); it is commonly used alongside other D02 test methods and specifications such as D4815 and D4814.

Q: What are the key keywords?

A: Total oxygen, reductive pyrolysis, gasoline, methanol, oxygenates, ethanol, MTBE, method precision, PLOQ, ASTM D5622-24.