ASTM D4928-24 PDF
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St ASTM D4928-24
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Ст ASTM D4928-24
Original standard ASTM D4928-24 in PDF full version. Additional info + preview on request
Full title and description
ASTM D4928-24 — Standard Test Method for Water in Crude Oils by Coulometric Karl Fischer Titration. This method describes procedures for determining water content in crude petroleum using coulometric Karl Fischer titration techniques and associated sample handling and homogenization guidance.
Abstract
This test method specifies coulometric Karl Fischer titration procedures for measurement of water in crude oils, intended for the range of approximately 0.02 to 5 mass percent water. It covers procedure selection, sample size and preparation, instrument verification and quality control to produce reproducible determinations of water content in crude petroleum samples.
General information
- Status: Active standard (current designation D4928-24).
- Publication date: 1 October 2024 (D4928-24 edition).
- Publisher: ASTM International.
- ICS / categories: 75.040 (Crude petroleum) — petroleum/analytical test methods.
- Edition / version: 2024 edition (designated D4928-24).
- Number of pages: 10 pages (typical published length for this designation).
Scope
This standard provides a procedure for determining the water content of crude oils by coulometric Karl Fischer titration. The recommended working range of the method is approximately 0.02 to 5 mass percent water; it includes guidance on sample homogenization, appropriate sample sizes, syringe selection, verification of instrument calibration, and quality-control checks required to obtain reliable results.
Key topics and requirements
- Determination of water in crude oils using coulometric Karl Fischer titration technique.
- Applicable water concentration range: about 0.02–5 mass percent (procedural limits and recommended sub-ranges may be specified within the standard).
- Requirements for sample collection, homogenization, and representative subsampling.
- Instrumentation and reagent verification, including calibration and use of water standards.
- Quality control and precision/bias statements based on interlaboratory studies.
- Two procedural approaches (where noted in the method) with defined working ranges and precision statements.
Typical use and users
Used by petroleum testing laboratories, crude oil producers and processors, quality/control laboratories in refineries, custody-transfer testing services, and instrument manufacturers. Typical users require routine and forensic determinations of water content for process control, storage/transport decisions, and contractual specifications.
Related standards
Standards commonly used alongside D4928 include other petroleum and water-in-product methods such as related Karl Fischer procedures and complementary ASTM methods for crude-oil properties and contaminants; laboratories often reference interlaboratory study reports and subcommittee guidance when implementing D4928.
Keywords
coulometric; Karl Fischer; water in crude oils; crude petroleum; homogenization; titration; moisture content; petroleum analysis; water determination; D4928-24.
FAQ
Q: What is this standard?
A: ASTM D4928-24 is the 2024 edition of the ASTM standard test method for determining water in crude oils by coulometric Karl Fischer titration. It defines procedures, limits, and quality-control requirements for that determination.
Q: What does it cover?
A: It covers sample preparation and homogenization, instrument and reagent verification, the coulometric Karl Fischer titration procedure(s), typical working ranges (approximately 0.02–5 mass percent water), and precision/bias information derived from interlaboratory studies.
Q: Who typically uses it?
A: Petroleum and crude-oil testing laboratories, refinery and production quality-control personnel, independent testing providers, and instrument manufacturers or vendors who support Karl Fischer moisture analysis in hydrocarbon matrices.
Q: Is it current or superseded?
A: The designation D4928-24 indicates the 2024 edition; it is shown as the active/current edition published 1 October 2024. Users should confirm with ASTM for any amendments or revisions after that date.
Q: Is it part of a series?
A: D4928 is part of ASTM's petroleum testing suite under Committee D02 and is related to other D02 methods for crude and refined products; it is accompanied by research reports and interlaboratory study documents that support precision and method development.
Q: What are the key keywords?
A: Coulometric, Karl Fischer, water, crude oils, homogenization, titration, moisture, petroleum analysis, D4928-24.