ASTM F2059-25 PDF

Full title and description

ASTM F2059-25 — Standard Test Method for Laboratory Oil Spill Dispersant Effectiveness Using the Swirling Flask. This test method specifies a laboratory swirling-flask procedure for measuring dispersant effectiveness on a variety of oils under low mixing-energy conditions; results provide baseline comparative values for dispersant performance and oil susceptibility in controlled laboratory conditions.

Abstract

This standard defines the swirling flask test apparatus, sample preparation, dosing, extraction and analysis steps (including solvent extraction and GC-FID quantification), and the calculation used to report dispersant effectiveness as a percentage. It is intended to provide reproducible, low-energy laboratory baseline data for comparing dispersants, oil types, and weathering stages, while noting that laboratory values do not directly equate to field effectiveness.

General information

• Status: Active (published).
• Publication date: September 1, 2025.
• Publisher: ASTM International.
• ICS / categories: 75.180.30 (volumetric equipment and measurements).
• Edition / version: F2059-25 (2025 edition).
• Number of pages: 5.

Scope

The standard covers the laboratory procedure using the swirling flask apparatus to determine oil spill dispersant effectiveness on various oils. It applies to dispersant performance testing in controlled laboratory conditions only, and does not prescribe field application or predict in‑sea effectiveness; results are baseline comparative values. The method is specific to the swirling flask apparatus and associated analytical procedures.

Key topics and requirements

• Definition and setup of the swirling flask test apparatus (low mixing‑energy configuration).
• Standardized sample volumes, oil weathering states, and dispersant dosing procedures.
• Mixing, settling, and sampling protocol to obtain dispersed oil fraction.
• Solvent extraction (typical solvents noted historically: pentane / dichloromethane) and quantitative analysis by gas chromatography with flame ionization detection (GC‑FID) using internal standards.
• Calculation and reporting of dispersant effectiveness as a percentage; statement of limitations and uncertainty.
• Requirement to report SI units and relevant test conditions (temperature, salinity, mixing energy).
• Notes on applicability limits: results are comparative laboratory baselines and not direct predictors of open‑sea performance.

Typical use and users

Used by environmental testing laboratories, dispersant manufacturers, oil spill response organizations, regulatory agencies, research institutions, and consultants to compare dispersant products, verify batch performance, evaluate dispersant/oil interactions, and support response planning and product approval processes.

Related standards

Closely related to ASTM F3251 (Baffled Flask test method) which provides a higher mixing‑energy laboratory alternative; also follows earlier editions of F2059 (for example F2059‑21) and other dispersant testing guidance used by response organizations. Users commonly consult both swirling‑flask and baffled‑flask methods to bracket likely performance under different sea energies.

Keywords

oil spill; dispersant; dispersant effectiveness; swirling flask; laboratory test; GC‑FID; extraction; low mixing energy; ASTM F2059; oil weathering.

FAQ

Q: What is this standard?

A: ASTM F2059-25 is a laboratory test method that specifies the swirling flask procedure for measuring the relative effectiveness of oil spill dispersants under controlled, low mixing‑energy conditions.

Q: What does it cover?

A: It covers apparatus setup, test procedure, sample handling, solvent extraction and GC‑FID analysis, data calculation and reporting, and limitations of the method. The method is intended for baseline comparative testing and is not a direct field‑effectiveness predictor.

Q: Who typically uses it?

A: Environmental testing laboratories, oil spill response organizations, dispersant manufacturers, regulators, and researchers use this standard to compare dispersant performance and to support product evaluation and response planning.

Q: Is it current or superseded?

A: Current — the F2059-25 edition was published on September 1, 2025 (supersedes earlier editions such as F2059‑21). Users should verify they are using the latest edition for compliance.

Q: Is it part of a series?

A: It is part of the ASTM F20 committee’s suite of oil spill dispersant test methods; the swirling flask (F2059) is commonly paired with the Baffled Flask method (F3251) to assess performance across low and high mixing‑energy regimes.

Q: What are the key keywords?

A: dispersant, oil spill, swirling flask, dispersant effectiveness, GC‑FID, extraction, low mixing energy, ASTM F2059.