ASTM D7041-16 (2021) PDF

Full title and description

Standard Test Method for Determination of Total Sulfur in Liquid Hydrocarbons and Hydrocarbon‑Oxygenate Blends by Gas Chromatography with Flame Photometric Detection — designation D7041‑16 (reapproved 2021). The method specifies analysis of total sulfur in liquid hydrocarbon samples (and hydrocarbon‑oxygenate blends) using gas chromatography coupled with a flame photometric detector (GC‑FPD).

Abstract

This test method describes the determination of total sulfur in liquid hydrocarbons with final boiling points below about 450 °C. Samples are injected into a gas chromatograph, oxidized in a high‑temperature zone, and sulfur is converted to SO2 which is detected and quantified by a flame photometric detector. The method is intended for total sulfur levels roughly from 0.5 mg/kg to 100 mg/kg (pooled limit of quantification ≈ 1 mg/kg).

General information

• Status: Active (current edition reapproved 2021).
• Publication date: Current edition approved in July 2021 (listed as D7041‑16, reapproved 2021; publication listings show late June/early July 2021).
• Publisher: ASTM International (Committee D02, Subcommittee D02.03 Elemental Analysis).
• ICS / categories: 75.160.20 (Liquid fuels / petroleum products).
• Edition / version: D7041‑16 (Reapproved 2021) — often shown as D7041‑16R21 or D7041‑16(2021).
• Number of pages: 5 pages (concise test method).

Scope

The method covers determination of total sulfur in liquid hydrocarbons (final boiling point < 450 °C) and hydrocarbon‑oxygenate blends by GC with flame photometric detection. It is applicable to total sulfur concentrations approximately from 0.5 mg/kg S up to 100 mg/kg S; the pooled limit of quantification (PLOQ) from interlaboratory data is reported at about 1 mg/kg S. The standard notes that samples outside this range may be tested but precision statements may not apply.

Key topics and requirements

• Analytical technique: gas chromatography with flame photometric detector (GC‑FPD) — sample injection, oxidation in high temperature zone (> ~900 °C), conversion of sulfur to SO2 and FPD quantification.
• Applicable concentration range: nominally 0.5 to 100 mg/kg S; PLOQ ≈ 1 mg/kg S (interlaboratory result).
• Instrument requirements: gas chromatograph with automatic sample injection or valve, controlled carrier and detector gas supply, FPD sensitivity sufficient to detect low mg/kg sulfur levels; typical instrument parameters and calibration procedures are specified.
• Calibration and standards: external calibration with appropriate sulfur standards; precision and repeatability statements are included for the method’s validated range.
• Referenced practices: method cross‑references sampling and density practices (e.g., ASTM D4057, D1298) and FPD usage practice (ASTM E840) as part of method implementation.
• Safety and limitations: users must observe standard laboratory safety and consider regulatory limitations; the method does not replace safety assessments.

Typical use and users

Routine and investigative elemental sulfur analysis in petroleum and fuel testing laboratories; users include refinery QC and process control labs, contract analytical labs, petrochemical process monitoring groups, and regulatory or standards organizations comparing or validating low‑level sulfur in fuels and feedstocks. The method is used where GC‑FPD instrumentation and trained analysts are available.

Related standards

The test method is part of the ASTM D02 portfolio (Petroleum Products, Liquid Fuels, and Lubricants) and cross‑references several ASTM practices and test methods such as D1298 (density/gravity), D4057 (manual sampling), and E840 (use of FPDs). Other ASTM sulfur methods commonly used for total sulfur analysis (alternative or complementary techniques) include ASTM D5453 (UV fluorescence) and ASTM D4294 (X‑ray fluorescence), among others.

Keywords

total sulfur; sulfur determination; gas chromatography; flame photometric detector; GC‑FPD; liquid hydrocarbons; hydrocarbon‑oxygenate blends; petroleum analysis; ASTM D7041.

FAQ

Q: What is this standard?

A: ASTM D7041‑16 (reapproved 2021) is a test method that specifies the determination of total sulfur in liquid hydrocarbons and hydrocarbon‑oxygenate blends using gas chromatography with a flame photometric detector (GC‑FPD).

Q: What does it cover?

A: It covers samples with final boiling points below about 450 °C and is applicable for total sulfur concentrations approximately from 0.5 mg/kg to 100 mg/kg (PLOQ about 1 mg/kg). The method describes instrument requirements, sample handling, calibration and the analytical procedure using GC‑FPD.

Q: Who typically uses it?

A: Petroleum and fuel testing laboratories, refinery and process control QC groups, contract analytical labs and other organizations needing low‑level total sulfur determination where GC‑FPD instrumentation is available.

Q: Is it current or superseded?

A: The D7041‑16 edition is shown as reapproved in 2021 and listed as active/current (often referenced as D7041‑16R21 or D7041‑16(2021)). Users should check the official ASTM document record for any amendments or later revisions.

Q: Is it part of a series?

A: It belongs to ASTM Committee D02 (Petroleum Products, Liquid Fuels, and Lubricants) and specifically to Subcommittee D02.03 (Elemental Analysis). It is one of several ASTM methods for sulfur analysis in fuels and oils.

Q: What are the key keywords?

A: total sulfur; GC‑FPD; gas chromatography; flame photometric detector; fuels; hydrocarbon‑oxygenate blends; low‑level sulfur analysis; ASTM D7041.