ASTM D2974-25 PDF

Full title and description

Standard Test Methods for Determining the Water (Moisture) Content, Ash Content, and Organic Material of Peat and Other Organic Soils — ASTM D2974-25. This document specifies laboratory procedures for measuring moisture (water) content, determining ash content, and estimating organic material in peats and other organic soils (including organic clays, silts, and mucks). It includes alternative methods targeted to general classification and to evaluation of peat for fuel use.

Abstract

ASTM D2974-25 provides short, test-method procedures to quantify moisture, ash, and organic matter in peat and related organic soils. The standard gives distinct procedures for general classification and for fuel-evaluation uses (different ignition temperatures and preparatory drying steps), states units (SI), and references companion practices for sampling, significant digits, and laboratory competence. The procedures are intended for laboratory determination and reporting of results used in classification, geotechnical assessment, horticultural/agricultural evaluation, and fuel appraisal.

General information

• Status: Active (published standard).
• Publication date: 15 March 2025.
• Publisher: ASTM International.
• ICS / categories: ICS 65.080 (Fertilizers) / Soil and peat testing; Book of Standards volume 04.08; Subcommittee D18.22.
• Edition / version: D2974-25.
• Number of pages: 4.

Scope

The standard covers measurement of water (moisture) content, ash content, and organic material in peat and other organic soils. It provides two main approaches for water/ash determination depending on intended use: a general classification method and an alternative (fuel-evaluation) method. The standard establishes oven-drying and ignition procedures, requires use of SI units, and defers sampling competence and reporting conventions to related ASTM practices.

Key topics and requirements

• Determination of water (moisture) content for peats and organic soils (oven-drying procedures and two-step approaches when relevant).
• Ash-content determination by ignition with two methods: Method A (general classification) and Method B (fuel evaluation) — Method A uses ignition near 440 ± 40 °C; Method B uses higher-temperature ignition near 750 ± 38 °C.
• Calculation and reporting rules that follow ASTM guidelines for significant digits and rounding (Practice D6026 referenced).
• Specification that SI units are the standard for reported values.
• Notes on intended applications: classification, geotechnical uses, horticulture/agriculture, and peat fuel evaluation.

Typical use and users

This standard is used by laboratory technicians, soil scientists, peat producers, fuel evaluators, geotechnical engineers, agronomists, horticulturalists, and regulatory/test laboratories that need standardized measures of moisture, ash, and organic content in organic soils and peat. It is commonly used for classification of peat/organic soils, quality control, geotechnical reporting, and assessing peat suitability as fuel.

Related standards

Commonly referenced ASTM methods and practices include Test Method D2216 (alternative moisture determination for mineral soils), Classification D4427 (peat classification), Practice D3740 (laboratory competence), and Practice D6026 (significant digits and rounding). These provide sampling, competence, and supplementary calculation/reporting guidance aligned with D2974-25.

Keywords

moisture content; water content; ash content; organic material; organic soils; peat; mucks; percent organic matter; peat fuel evaluation; D2974; soil testing.

FAQ

Q: What is this standard?

A: ASTM D2974-25 is a short ASTM standard that specifies laboratory test methods to determine water (moisture) content, ash content, and organic material of peat and other organic soils.

Q: What does it cover?

A: It covers oven-drying procedures for moisture determination, procedures to determine ash content and percent organic material, and offers different ignition methods for general classification versus fuel-evaluation of peat. The standard requires SI units and references companion ASTM practices for sampling and reporting.

Q: Who typically uses it?

A: Laboratory personnel, soil and peat analysts, geotechnical engineers, peat producers and processors, agronomy/horticulture professionals, and agencies that perform soil classification or evaluate peat as a fuel.

Q: Is it current or superseded?

A: Current—this edition is ASTM D2974-25, published 15 March 2025 (active).

Q: Is it part of a series?

A: It is part of the ASTM D (Soils) family of standards and is published within Book of Standards volume 04.08; it was developed by Subcommittee D18.22 and commonly used alongside related D-series methods (for example D2216, D4427, D3740, D6026).

Q: What are the key keywords?

A: Moisture content; ash content; organic material; peat; organic soils; fuel evaluation; percent organic matter.