Physical Address
304 North Cardinal St.
Dorchester Center, MA 02124
D1129-24 – Standard Test Method Technical Guide
ASTM D1129-24, officially designated as the Standard Terminology Relating to Water, serves as the authoritative lexicon for all standards developed under the jurisdiction of ASTM Committee D19 on Water. Released under the fixed designation D1129 and approved on November 1, 2024, this compilation ensures uniformity, precision, and consistency in the terminology used across the entire spectrum of water-related testing, analysis, and treatment standards.
📖 Scope and Hierarchical Authority
According to Section 1.1 of the standard, D1129-24 is a compilation of definitions specifically used in Committee D19 standards. A critical governance rule is established in Section 1.3: in the event of a conflict between definitions, the definitions within D1129 take precedence over all other D19 terminology standards, such as D6161 and D7902. Terms are included only if they are used in more than one D19 standard (Section 1.4), avoiding redundancy while ensuring broad applicability. The standard explicitly notes in Section 1.6 that the deletion of any term or definition constitutes a technical change, necessitating a formal ballot action.
📊 Key Defined Terms and Examples
The standard includes precise, quantitative, and mechanistic definitions for a wide range of water-related terms. The following table highlights a selection of foundational definitions extracted directly from D1129-24 and its referenced documents.
| 🟦 Term | 📏 Definition / Formula | 📐 Source Standard |
|---|---|---|
| absolute filter rating | Particle size above which 100% of particles that are trapped on or within the filter medium. | D6161 |
| absorbance | Logarithm to the base 10 of the reciprocal of the transmittance (T). A = log10 (1 / T) = –log10 T. | D4691 |
| absorption | Release for desorption holding of a substance within a solid by cohesive or capillary forces. | D6161 |
| absorptivity | Absorbance (A) divided by the product of the sample path length (b) and the concentration (c). a = A / bc. | D4691 |
| accelerated erosion | Erosion at a rate greater than geologic or natural erosion. Usually associated with anthropogenic activities. | D4410 |
⚙️ Governance and Application
Section 3 of D1129-24 highlights that this terminology is recommended for general use within the entire water analysis community. The maintenance of this vital standard is the direct responsibility of Subcommittee D19.12 on Terminology, which conducts required periodic reviews to ensure the content remains relevant and technically accurate. Editorial additions can be made according to Committee D19 bylaws (Section 1.5), and the standard was developed in accordance with internationally recognized principles from the WTO Technical Barriers to Trade (TBT) Committee (Section 1.9).
💡 Tip: When drafting a new D19 standard, refer to D1129-24 for standardized terminology. As per Section 1.4, common terms already defined in D1129 need not be redefined in individual standards provided proper reference to D1129 is made. This maintains a single source of truth for the committee’s terminology.
⚡ Important: The deletion of any term or definition is strictly classified as a technical change requiring formal ballot action (Section 1.6). Additionally, notes and discussions accompanying definitions are considered supplementary information and are not part of the standard requirements (Section 1.8).
❓ Frequently Asked Questions
🔍 What is the primary scope of ASTM D1129-24?
D1129-24 provides a standardized compilation of definitions for terms used across all standards managed by ASTM Committee D19 on Water, ensuring consistent communication and interpretation within the water testing and analysis community.
💡 Which standard governs in a conflict of definitions between D19 standards?
According to Section 1.3 of the standard, Terminology D1129 shall govern all other Committee D19 terminology standards, including specialized terminologies like D6161 and D7902, in the event of a conflict.
⚡ How can terms be added or removed from D1129?
New terminology may be added editorially according to Committee D19 bylaws when approved in other standards (Section 1.5). However, the deletion of any existing term or definition is strictly considered a technical change and requires a full formal ballot action (Section 1.6).
📌 Which subcommittee is responsible for maintaining this standard?
Subcommittee D19.12 on Terminology is specifically responsible for the required periodic review of D1129 (Section 1.7) to ensure the definitions remain current, accurate, and appropriate for use in all D19 standards.