ISO 332-1981 rus PDF

Full title and description

St ISO 332-1981 — Coal — Determination of nitrogen — Macro Kjeldahl method. This entry refers to ISO 332:1981 (second edition), an International Standard that specifies the macro Kjeldahl procedure for determining nitrogen content in coal and related solid mineral fuels; the "rus" suffix indicates interest in a Russian-language or Russia-adopted context for this standard.

Abstract

ISO 332:1981 defines the principle, reagents, apparatus and procedure for the macro Kjeldahl determination of nitrogen in coal. The method converts organic nitrogen to ammonium sulfate by digestion in sulfuric acid with catalysts, liberates ammonia by alkaline distillation, and quantifies it by acid titration to calculate nitrogen content. The published standard is concise (3 pages) and was issued as Edition 2 in December 1981.

General information

• Status: Withdrawn (ISO record shows the 1981 edition as withdrawn).
• Publication date: 1981 (Edition 2 — published December 1981 / late 1981).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 73.040 (Coals — methods of analysis).
• Edition / version: Edition 2 (1981).
• Number of pages: 3 pages (short-method specification).

Key bibliographic and lifecycle details are recorded by ISO and by commercial standards distributors; the standard is listed as withdrawn in the ISO catalogue.

Scope

This standard covers the macro Kjeldahl method for the determination of nitrogen in coal and similar solid mineral fuels. It is intended for analytical laboratories performing coal analysis and provides a single, standard procedural description (digestion, neutralization/distillation, and titration) suitable for samples where the macro Kjeldahl approach is appropriate. National and regional standards later consolidated or replaced older ISO procedures for coal nitrogen determination.

Key topics and requirements

• Principle of the macro Kjeldahl method: digestion of sample in concentrated sulfuric acid with catalyst to convert nitrogen to ammonium sulfate, followed by alkalization, distillation of ammonia and titration.
• Specified reagents and catalysts (typical: concentrated H2SO4 and copper/selenium catalysts where applicable).
• Apparatus and basic equipment for digestion, distillation and titration suitable for macro-scale determinations.
• Sample preparation and recommended sample mass ranges for macro Kjeldahl determinations.
• Expression and calculation of results as percentage nitrogen in the fuel sample.
• Short format: the published document is concise (covers necessary procedural steps without extensive annexes).

Typical use and users

Used historically by coal testing laboratories, research institutes, fuel quality control units and industrial laboratories engaged in coal characterization. Typical users are analytical chemists and technicians performing routine proximate/ultimate analyses of coal, especially where Kjeldahl methods are preferred or required by contractual/test specifications. Following withdrawal of the ISO text, national standards and later ISO methods (and GOST adoptions) are more commonly used in regulatory and commercial settings.

Related standards

ISO 333 (semi-micro Kjeldahl method for coal) is closely related and covers a complementary semi-micro procedure; national standards (GOST) for nitrogen determination in solid mineral fuels (e.g., earlier GOST 2408.2-75 and later consolidated documents such as GOST 28743 series) implement or adapt Kjeldahl-based methods for Russian and CIS practice. Users should consult the applicable national/regional standards for current authoritative test procedures.

Keywords

Coal, nitrogen determination, Kjeldahl method, macro Kjeldahl, coal analysis, ISO 332:1981, withdrawn, GOST, fuel analysis.

FAQ

Q: What is this standard?

A: ISO 332:1981 is an International Standard titled "Coal — Determination of nitrogen — Macro Kjeldahl method" that specifies the macro Kjeldahl procedure for measuring nitrogen in coal.

Q: What does it cover?

A: It covers the principle, reagents, apparatus and stepwise procedure (digestion, distillation, titration) for the macro Kjeldahl determination of nitrogen in solid mineral fuels. The published document is brief (3 pages) and provides the core method rather than extended guidance.

Q: Who typically uses it?

A: Analytical laboratories and technicians involved in coal/fuel testing, quality control, and research on coal composition; historically it served laboratories requiring a standard macro Kjeldahl procedure for nitrogen analysis. After withdrawal, many laboratories use corresponding national standards or newer ISO methods.

Q: Is it current or superseded?

A: The ISO 332:1981 edition is recorded as withdrawn in the ISO catalogue. In practice, national standards (for example, GOST documents) and subsequent ISO work on nitrogen determination have superseded or consolidated older ISO methods for coal; users should follow the currently adopted national or international standard in force for regulatory or contractual testing.

Q: Is it part of a series?

A: Yes — it is related to other Kjeldahl-method standards for coal, notably ISO 333 (semi-micro Kjeldahl method) and other analytical standards addressing sulfur, moisture and elemental analysis in coal. These related standards provide complementary methods for nitrogen and other elemental determinations.

Q: What are the key keywords?

A: Coal; nitrogen; Kjeldahl; macro method; coal analysis; fuel testing; ISO 332:1981; withdrawn; GOST.