ASTM D7423-25 PDF

Full title and description

Standard Test Method for Determination of Oxygenates in C2, C3, C4, and C5 Hydrocarbon Matrices by Gas Chromatography and Flame Ionization Detection — ASTM D7423-25. This method specifies a multidimensional gas chromatography procedure with flame ionization detection (GC–FID) for quantitative determination of trace oxygenated compounds (alcohols, ethers, aldehydes, ketones, etc.) in light hydrocarbon matrices used as chemical feedstocks or fuels.

Abstract

The ASTM D7423-25 test method defines analytical procedures to identify and quantify oxygenate impurities in C2–C5 hydrocarbon streams using multidimensional GC and FID. It provides detection and linear working ranges, retention-order identification against reference standards, and guidance on applicability (hydrocarbon matrices with final boiling points ≤ 200 °C). The procedure is intended for quality control and catalyst-feedstock monitoring in petrochemical and LPG-related operations.

General information

• Status: Current, published (active standard; replaces the 2023 edition).
• Publication date: November 1, 2025 (ASTM D7423-25).
• Publisher: ASTM International (developed by Committee D02 — Petroleum Products, Liquid Fuels, and Lubricants).
• ICS / categories: 71.080.01 (Organic chemicals in general).
• Edition / version: ASTM D7423-25 (revision of D7423-23 / D7423-17).
• Number of pages: 9 pages.

Scope

This test method covers the gas chromatographic procedure for quantitative determination of organic oxygenates in C2, C3, C4 and C5 hydrocarbon matrices by multidimensional GC with flame ionization detection. It is applicable when the hydrocarbon matrices have a final boiling point not greater than 200 °C and establishes a linear working range for oxygenates (typically about 0.50 mg/kg to 100 mg/kg). Identification is by comparison to reference standards and expected column elution order. The method includes safety notes relevant to LPG handling and sampling.

Key topics and requirements

• Multidimensional gas chromatography technique coupled with flame ionization detection (GC–FID) for trace oxygenate analysis.
• Target analytes include alcohols, ethers, aldehydes and ketones commonly found as trace impurities (examples: methanol, ethanol, MTBE, TAME, acetone, acetaldehyde).
• Applicable matrix range: C2–C5 hydrocarbon streams with final boiling point ≤ 200 °C.
• Quantitation range/limits: typical linear range ~0.50 mg/kg to 100 mg/kg (method-dependent).
• Identification strategy: use of reference standards and retention-order confirmation rather than full-spectrum matching.
• Safety and procedural notes: guidance on LPG sampling safety and general laboratory safety for flammable hydrocarbon matrices.

Typical use and users

Used by analytical laboratories in refineries, petrochemical plants, LPG producers, polymer-feedstock manufacturers, and contract testing labs for quality control, incoming feedstock inspection, catalyst protection monitoring, and regulatory/compliance testing where trace oxygenates can affect downstream processes. The method supports rapid, low-level determination of alcohols, ethers and carbonyls in light hydrocarbon streams.

Related standards

This edition revises and replaces ASTM D7423-23 (and earlier D7423-17). It is developed under ASTM Committee D02 (Petroleum Products, Liquid Fuels, and Lubricants) and is conceptually related to other ASTM hydrocarbon and LPG analysis methods maintained by the same committee (see committee listings for related gas-chromatographic test methods).

Keywords

oxygenates, gas chromatography, GC–FID, C2 hydrocarbons, C3 hydrocarbons, C4 hydrocarbons, C5 hydrocarbons, methanol, ethanol, MTBE, TAME, trace analysis, LPG sampling, D7423-25.

FAQ

Q: What is this standard?

A: ASTM D7423-25 is a standardized test method for determining oxygenated organic impurities in C2–C5 hydrocarbon matrices by multidimensional gas chromatography with flame ionization detection.

Q: What does it cover?

A: It covers procedure, calibration/quantitation range (approx. 0.50 mg/kg to 100 mg/kg), identification by reference standards and retention order, matrix applicability (final boiling point ≤ 200 °C), and safety considerations for handling LPG and light hydrocarbons.

Q: Who typically uses it?

A: Analytical and QC laboratories at refineries, petrochemical producers, LPG processors, polymer-feedstock manufacturers, and third‑party testing labs performing trace oxygenate analysis.

Q: Is it current or superseded?

A: Current — published as ASTM D7423-25 on November 1, 2025; it supersedes the D7423-23 edition.

Q: Is it part of a series?

A: It is maintained by ASTM Committee D02 and is one of several D-series test methods addressing hydrocarbon, LPG and petrochemical analysis (listed in the ASTM Book of Standards, Committee D02 collections).

Q: What are the key keywords?

A: Oxygenates, GC–FID, C2–C5 hydrocarbons, LPG sampling, trace analysis, methanol, ethanol, MTBE, retention time, D7423-25.