GOST 5985-2022 PDF

Full title and description

ГОСТ 5985-2022 — Нефтепродукты. Метод определения кислотности и кислотного числа (English title: Petroleum products. Method for determination of acidity and acid number). This is a межгосударственный (interstate) standard that updates and replaces the earlier ГОСТ 5985-79 and specifies a chemical titrimetric procedure for measuring acidity expressed as mg KOH/100 cm3 (acidity for light petroleum fractions) and mg KOH/g (acid number for oils and greases).

Abstract

Standardized laboratory method for extraction and titrimetric determination of acidic compounds in a wide range of petroleum products (light distillates, fuels, oils and hydrocarbon greases), including required reagents, apparatus, sample preparation, titration end‑point, calculation and precision statements.

General information

• Status: Действующий (interstate standard, adopted by responsible national bodies).
• Publication date: Approved 30 June 2022 (Rosstandart approval, Приказ № 555‑ст).
• Publisher: Межгосударственный стандарт; published/maintained through national bodies including Rosstandart and regional standards catalogues (EASC / Rosstandart).
• ICS / categories: 75.080 — Technology of extraction and processing of petroleum and related technologies.
• Edition / version: First issue 2022 (replaces ГОСТ 5985-79).
• Number of pages: Approximately 12–14 pages (published texts in standards libraries list 12–14 pages depending on formatting).

Scope

The standard applies to light petroleum fractions (motor and aviation gasoline, ligroins, kerosines, diesel fuel, jet fuels), turbine/transformer/transmission/hydraulic and special oils, and hydrocarbon greases. It establishes the procedure for extraction of acidic constituents (by boiling alcohol), subsequent titration with alcoholic potassium hydroxide in the presence of an indicator, and the calculation and reporting of acidity (mg KOH/100 cm3) for distilled fuels and acid number (mg KOH/g) for oils and greases.

Key topics and requirements

• Definitions of acidity and acid number and their units (mg KOH/100 cm3; mg KOH/g).
• Description of principle: extraction of acidic compounds with hot alcohol and titration with alcoholic KOH using an indicator.
• List of required reagents and purity (solvents, indicators, standard KOH solutions).
• Specified apparatus and glassware (laboratory measuring vessels, reflux/extraction equipment, burettes).
• Sample preparation, test procedure, end‑point determination, calculation formulas and result reporting.
• Precision and reproducibility statements (within‑laboratory and interlaboratory limits where provided).

Typical use and users

Used by quality control and testing laboratories in refineries, fuel and lubricant producers, petrochemical plants, independent testing houses, customs and regulatory laboratories, and research institutions concerned with fuel/oil quality. Typical activities include acceptance testing, in‑process control, regulatory compliance checks and forensic analysis of degraded or contaminated products.

Related standards

Normative references cited in the standard include related laboratory and reagent standards such as ГОСТ 1770 (laboratory glassware), ГОСТ 2517 (sampling of oil and petroleum products), ГОСТ 3118 (hydrochloric acid reagent), ГОСТ 4919.1 (preparation of indicator solutions), ГОСТ 5789 (toluene), ГОСТ 5955 (benzene), ГОСТ 6341 (succinic acid), and others. The document replaces ГОСТ 5985-79.

Keywords

acidity; acid number; petroleum products; titration; alcoholic KOH; extraction; fuel quality; oils; greases; ГОСТ 5985-79; Rosstandart.

FAQ

Q: What is this standard?

A: ГОСТ 5985-2022 is an interstate (Межгосударственный) standard that defines a laboratory titrimetric method for determining acidity and acid number in a range of petroleum products and hydrocarbon oils/greases. It was approved by Rosstandart on 30 June 2022.

Q: What does it cover?

A: It covers scope, definitions, reagents, apparatus, sample preparation, the extraction and titration procedure (alcohol extraction and titration with alcoholic KOH), calculation of results, result recording and method precision for light fuels, oils and hydrocarbon greases.

Q: Who typically uses it?

A: QC and analytical laboratories at refineries, fuel and lubricant manufacturers, independent testing labs, regulators, and research organizations performing quality control, acceptance testing, regulatory compliance and investigations of petroleum product acidity.

Q: Is it current or superseded?

A: The document is the 2022 replacement of ГОСТ 5985-79 (i.e., it supersedes the 1979 edition). While approved on 30 June 2022, national entry‑into‑force dates have varied by country and have been postponed several times in Russia; official sources list scheduled effective dates and updates (for example a listed effective date of 01 April 2026 in some registries). Check the relevant national standards catalogue or the adopting national body for the exact date of mandatory application in a given country.

Q: Is it part of a series?

A: It belongs to the oil and petroleum product test methods family (ICS 75.080) and is part of national/interstate normative documents dealing with petroleum product testing; it replaces the earlier ГОСТ 5985-79 and references several other ГОСТs for sampling, reagents and laboratory equipment.

Q: What are the key keywords?

A: Acidity; acid number; petroleum products; titration; alcoholic potassium hydroxide; extraction; fuel testing; lubricants; ГОСТ 5985-79.