ISO 333-1983 rus PDF

Full title and description

St ISO 333-1983 (Ст ISO 333-1983) — "Coal — Determination of nitrogen — Semi-micro Kjeldahl method" — Russian-language edition/translation of ISO 333:1983. The document specifies a semi-micro Kjeldahl laboratory procedure for determining total nitrogen in samples of hard coal, brown coal and lignite; the Russian version is a language rendering of the original ISO text for use by Russian-speaking laboratories and purchasers.

Abstract

This standard gives a semi-micro Kjeldahl method for the determination of nitrogen in coal (hard coal, brown coal and lignite). It covers sample preparation, digestion, neutralization, distillation and titration steps required to report nitrogen content on a mass-percentage basis and includes required reagents, apparatus and calculation procedure. (ISO 333:1983, Russian-language edition).

General information

• Status: Withdrawn (revised by a later edition).
• Publication date: 1983 (Edition 3, published September 1983 / 1983-08–1983-09).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 73.040 — Coals.
• Edition / version: Edition 3 (1983).
• Number of pages: 4 pages (original ISO English edition); Russian translation typically matches range.

Scope

Specifies a semi-micro Kjeldahl analytical method to determine the nitrogen content of hard coal, brown coal and lignite. The procedure describes sample size, digestion with sulfuric acid (and catalysts), conversion of nitrogen to ammonium form, distillation of ammonia into boric acid, titration and calculation of nitrogen percentage. The standard notes an alternative macro Kjeldahl method (ISO 332).

Key topics and requirements

• Scope and field of application: nitrogen determination in coal types (hard coal, brown coal, lignite).
• Required apparatus: digestion vessel, heating source, distillation apparatus, burettes and volumetric glassware.
• Reagents and catalysts: concentrated sulfuric acid, suitable catalysts for Kjeldahl digestion, boric acid solution for trapping ammonia.
• Procedure steps: weighing, digestion, neutralization, steam distillation, trapping, titration and calculation of nitrogen content.
• Precision and reporting: method includes directions for calculation and reporting of results (mass percentage of nitrogen) and refers to appropriate quality-control practice for laboratory analysis.

Typical use and users

Used by analytical chemistry laboratories in coal testing, power generation and fuel quality control, research institutions studying coal composition, and regulatory or certification bodies that require standardized determination of nitrogen in coal samples. Russian-language edition facilitates use by Russian-speaking labs and purchasers.

Related standards

ISO 332 — Coal — Determination of nitrogen — Macro Kjeldahl method (alternative macro procedure). ISO 333:1996 — later revision of ISO 333 (updates/replaces the 1983 edition). Other coal analysis standards (e.g., moisture, sulfur methods) are commonly used alongside ISO 333 procedures for complete fuel characterization.

Keywords

coal; nitrogen determination; Kjeldahl; semi-micro Kjeldahl; lignite; brown coal; hard coal; ISO 333; analytical chemistry; fuel analysis; Russian translation.

FAQ

Q: What is this standard?

A: ISO 333:1983 defines a laboratory semi-micro Kjeldahl method to determine total nitrogen in coal; "St ISO 333-1983 rus" refers to the Russian-language edition/translation of that ISO document.

Q: What does it cover?

A: It covers sample preparation, digestion, distillation, titration and calculation steps for reporting nitrogen content (mass percent) in hard coal, brown coal and lignite, and lists required apparatus and reagents.

Q: Who typically uses it?

A: Coal testing and quality-control laboratories, power plant analytical labs, research organizations working on coal characterization, and regulatory/certification bodies — particularly Russian-speaking users when using the Russian edition.

Q: Is it current or superseded?

A: The 1983 edition is withdrawn and was later revised; ISO shows ISO 333:1983 as withdrawn and indicates a later version ISO 333:1996 (the 1996 version supersedes the 1983 text). Purchasers should consult the latest active edition before use.

Q: Is it part of a series?

A: It is part of ISO methods for coal analysis (neighboring standards include ISO 332 for the macro Kjeldahl nitrogen method and other ISO coal- and coke-analysis standards). These standards are commonly used together for comprehensive coal characterization.

Q: What are the key keywords?

A: coal, nitrogen, Kjeldahl, semi-micro, lignite, brown coal, hard coal, fuel analysis, ISO 333.