ASTM D6470-99 (2015) rus PDF

Full title and description

ASTM D6470-99(2015) — Standard Test Method for Salt in Crude Oils (Potentiometric Method). Describes a potentiometric titration procedure for the determination of water‑extractable inorganic halides (reported as % m/m NaCl) in crude oils and other heavier petroleum products.

Abstract

This standard specifies a laboratory extraction and potentiometric titration procedure to quantify salt (expressed as % m/m NaCl) in crude oils, residues and fuel oils. The method covers the range 0.0005 % to 0.15 % (m/m) NaCl with a reported limit of detection of about 0.0002 % (m/m). The procedure includes homogenization, solvent extraction of the water phase and potentiometric determination of total halides in the aqueous extract.

General information

• Status: Superseded/revised — this 2015 reapproval of D6470-99 has subsequently been revised (see 2020 revision).
• Publication date: April 1, 2015 (reapproval of D6470-99).
• Publisher: ASTM International.
• ICS / categories: 75.040 — Crude petroleum and related products (petroleum testing and analysis).
• Edition / version: D6470-99, reapproved 2015 (designation shown as D6470-99(2015)).
• Number of pages: 6 pages (short test method).

Scope

This test method covers determination of water‑extractable inorganic halides in crude oils and other heavier petroleum products. Salt is reported as % (m/m) NaCl and the method applies over the approximate range 0.0005 % to 0.15 % (m/m) NaCl, with a limit of detection near 0.0002 % (m/m). The method is commonly used to decide on desalting needs and to estimate seawater contamination in used turbine and marine diesel oils; additives that produce water‑extractable salts are codetermined.

Key topics and requirements

• Principle: solvent extraction of oil to obtain an aqueous phase followed by potentiometric titration for total halides (reported as NaCl equivalent).
• Analytical range: nominal reporting range 0.0005–0.15 % (m/m) NaCl; detection limit ~0.0002 % (m/m).
• Required apparatus: extraction/reflux apparatus, thermostatic heating, separatory handling and a potentiometric titrator/electrode system.
• Sample preparation: homogenization of crude sample, controlled solvent/extractant volumes (xylene/alcohol/acetone/water sequence described in the method).
• Reporting: results reported as % m/m NaCl (water‑extractable inorganic halides).

Typical use and users

Used by refinery analytical laboratories, crude oil trading and custody transfer testing, pipeline and terminal quality control, environmental and corrosion assessment groups, and petrochemical R&D laboratories to determine desalting needs, assess seawater contamination and monitor halide levels that affect corrosion and downstream processing.

Related standards

Commonly cross‑referenced with other petroleum analysis and sampling standards, for example ASTM D4928 (water in crude oils by Karl Fischer), sampling and handling practices such as D4057, and other elemental/contamination test methods referenced in petroleum test suites. The 2015 reapproval has been associated with later revisions and related ASTM documents.

Keywords

crude oil; salt; halides; potentiometric titration; NaCl; desalting; seawater contamination; petroleum analysis.

FAQ

Q: What is this standard?

A: ASTM D6470-99(2015) is the reapproved 2015 edition of the Standard Test Method for Salt in Crude Oils (Potentiometric Method), which defines a laboratory extraction and potentiometric titration procedure to measure water‑extractable inorganic halides, reported as percent NaCl.

Q: What does it cover?

A: It covers extraction and potentiometric determination of salt (as NaCl) in crude oils and heavier petroleum products over the range ~0.0005 % to 0.15 % (m/m), with a detection limit near 0.0002 % (m/m). The method addresses sample homogenization, extraction solvents and titrimetric measurement of total halides.

Q: Who typically uses it?

A: Refinery and terminal QC laboratories, crude traders, pipeline operators, corrosion engineers, and petroleum testing laboratories use this method to determine desalting needs and to detect seawater or brine contamination in fuels and crude streams.

Q: Is it current or superseded?

A: The 2015 reapproval of D6470-99 has since been revised — a later edition (D6470-99(2020)) is published which revises the 2015 version; users should consult the most recent ASTM designation before applying the procedure.

Q: Is it part of a series?

A: It is part of the ASTM D02 committee suite of petroleum product test methods (elemental and contamination analysis) and is often referenced alongside complementary methods for water, sampling and elemental analysis (for example D4928, D4057 and others).

Q: What are the key keywords?

A: Crude oil, salt, halides, NaCl, potentiometric titration, desalting, seawater contamination, petroleum analysis.