GOST R 50457-92 PDF

Full title and description

GOST R 50457-92 — "Жиры и масла животные и растительные. Определение кислотного числа и кислотности" (English: "Animal and vegetable fats and oils. Determination of acid value and acidity"). The standard specifies titrimetric and potentiometric methods for determination of free fatty acids expressed as acid number and acidity in animal and vegetable fats and oils.

Abstract

This standard defines laboratory procedures for measuring the acid value (mg KOH/g of sample) and acidity (percent expressed as a fatty‑acid equivalent) of edible and technical fats and oils using titrimetric (indicator) and potentiometric titration techniques. Methods are suitable for routine quality control and specification testing of fats and oils but are not intended for waxes. The standard incorporates principles of ISO 660 (1983).

General information

• Status: Active / in force (document listed as действующий in Russian registries).
• Publication date: Approved in 1992 and introduced 01 January 1994 (GOST R 50457-92, entry into force 1994).
• Publisher: Gosstandart of the Russian Federation (Gosstandart / standardization authority of Russia).
• ICS / categories: Food technology — Edible oils and fats. Oilseeds (ICS 67.200.10).
• Edition / version: Original designation GOST R 50457-92 (1992); adopted for use 1994.
• Number of pages: 7–8 pages (sources list 7 or 8 pages).

Scope

The standard applies to animal and vegetable fats and oils and specifies titrimetric and potentiometric methods to determine free fatty acids. Results are reported as acid number (mg KOH per g of sample) or as acidity (%). The methods are intended for fats and oils used in food and technical applications and explicitly exclude waxes. Reference normative documents and alignment with ISO 660 are included.

Key topics and requirements

• Two accepted analytical techniques: titrimetric (indicator) titration and potentiometric titration for end‑point detection.
• Expression of results as acid number (mg KOH/g) and acidity (percentage as a specified fatty‑acid equivalent).
• Sample preparation rules, recommended sample masses depending on expected acidity, and solvent systems (typically mixtures of ether and ethanol or equivalent solvents).
• Specification of indicators, titrants (standard KOH or alkali), calibration and titrant standardization procedures, and precision requirements for routine laboratory practice.
• Explicit exclusion of waxes from applicability and cross‑references to related GOST/ISO methods.

Typical use and users

Routine use in quality control laboratories of edible‑oil producers, refiners, food processors, dairy and fat‑processing plants, independent testing laboratories, regulatory and inspection bodies, and research organizations performing compositional and quality assessments of fats and oils. Commonly used for product acceptance testing, shelf‑life studies, refining control and specification compliance.

Related standards

Normative references and related documents include ISO 660 (Determination of acid value and acidity — basis and comparable method), GOST 8285‑91 and later GOST R standards for vegetable and animal oils (for example GOST R 52110 series and related GOST R methods for peroxide value and moisture). Users often apply this standard alongside other GOST/ISO methods for comprehensive quality assessment.

Keywords

acid value, acidity, free fatty acids, fats and oils, titration, potentiometric titration, titrimetric method, ISO 660, GOST R, edible oils, quality control

FAQ

Q: What is this standard?

A: GOST R 50457-92 is the Russian technical standard that specifies methods for determining acid value and acidity in animal and vegetable fats and oils using titrimetric and potentiometric techniques.

Q: What does it cover?

A: It covers laboratory procedures for sample preparation, titration methods (indicator and potentiometric), calculation and reporting of acid number and acidity, limits on applicability (excludes waxes), and references to ISO practices.

Q: Who typically uses it?

A: Producers and refiners of edible and technical oils, food and dairy laboratories, independent testing labs, regulatory authorities, and researchers concerned with fat and oil quality and specification testing.

Q: Is it current or superseded?

A: The standard is listed in Russian registries as in force (действующий) in referenced sources; users should verify the current legal status or any amendments through an official standards provider or national registry before regulatory use.

Q: Is it part of a series?

A: Yes — it belongs to a family of GOST/GOST R standards addressing analysis and quality of fats and oils (including moisture/volatile content, peroxide value and other analytical methods) and aligns with ISO 660 principles.

Q: What are the key keywords?

A: Acid number, acidity, free fatty acids, titration, potentiometric titration, animal fats, vegetable oils, quality control, ISO 660.