ISO 157-1975 rus PDF

Full title and description

St ISO 157-1975 rus — International Standard ISO 157:1975, "Hard coal — Determination of forms of sulphur". Russian-language edition/translation title: «Уголь каменный. Определение форм серы». This product is the Russian-language (rus) version of the original ISO 157:1975 document intended for laboratory and industrial use in coal analysis.

Abstract

This standard specifies analytical methods for determining the different forms of sulfur present in hard coals — principally sulfate sulfur and pyritic sulfur — and provides the calculation method for organic (bound) sulfur as the difference between total sulfur and the sum of inorganic forms. It includes general principles, sample preparation and reporting basis. (ISO 157 has since been revised; later editions expand and update the analytical procedures.)

General information

• Status: Withdrawn (first edition replaced by later editions).
• Publication date: 1975 (first edition published January 1975; original first-edition date recorded as 15 January 1975 in some bibliographic records).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 73.040 (Coals).
• Edition / version: Edition 1 (1975).
• Number of pages: 10 pages (first edition).

General bibliographic details above are taken from ISO bibliographic records and national catalogues.

Scope

ISO 157:1975 defines laboratory methods for quantifying sulfate and pyritic sulfur in hard coal and describes how to calculate organic sulfur by difference from total sulfur. Results are normally reported on an air-dry (or other specified) basis and the standard addresses sample preparation and expression of results. Later revisions (ISO 157:1996 and ISO 157:2025) maintain the same core scope while updating analytical details.

Key topics and requirements

• Definition of sulfur forms in coal: sulfate sulfur, pyritic sulfur and organic sulfur.
• Sample preparation requirements (powdering, representative sampling and basis for reporting results).
• Analytical procedures for sulfate sulfur (chemical separation/precipitation and measurement) and for pyritic sulfur (separation and indirect determination, often via iron determination).
• Calculation of organic (bound) sulfur as the difference between total sulfur and measured inorganic forms.
• Requirements for expression of results, precision/limits as given in the standard, and reporting on specified moisture bases.

Key procedural and reporting requirements are summarized from the ISO standard family for ISO 157.

Typical use and users

Laboratories performing coal quality analysis, mining company technical laboratories, coal suppliers, power generation and coke/steel industry labs, environmental testing laboratories, and standards bodies use this standard (or its successors) to determine sulfur forms for quality control, combustion/emission calculations and product specification. Users typically require routine analytical equipment and trained technicians familiar with coal chemistry and gravimetric/chemical separation techniques.

Related standards

ISO 157:1975 was superseded by ISO 157:1996 (second edition) and the ISO 157 series was later revised and published as ISO 157:2025 (third edition). Related ISO and national standards address total sulfur determination (other ISO methods) and complementary coal analysis procedures (moisture, ash, elemental analysis).

Keywords

ISO 157, coal analysis, hard coal, forms of sulfur, sulfate sulfur, pyritic sulfur, organic sulfur, coal laboratory methods, Ст ISO 157-1975, Уголь каменный. Определение форм серы.

FAQ

Q: What is this standard?

A: ISO 157:1975 is the first-edition International Standard titled "Hard coal — Determination of forms of sulphur," describing methods to determine sulfate and pyritic sulfur and to calculate organic sulfur in hard coals.

Q: What does it cover?

A: It covers sample preparation, the specific analytical procedures for sulfate and pyritic sulfur, calculation of organic sulfur by difference, and requirements for expressing and reporting results (including the reporting basis). Later editions refine and update those procedures.

Q: Who typically uses it?

A: Analytical and quality-control laboratories in the coal, coke, steel and power-generation sectors, as well as regulatory and research laboratories involved in coal characterization and emissions assessment.

Q: Is it current or superseded?

A: ISO 157:1975 is withdrawn. It was replaced by ISO 157:1996 (subsequently also withdrawn) and the current published revision in the ISO bibliographic record is ISO 157:2025 (third edition). Users should refer to the latest edition (ISO 157:2025) for current procedures.

Q: Is it part of a series?

A: Yes — ISO 157 is part of a family of ISO standards for coal and coke analysis (ICS 73.040). Several related ISO standards cover total sulfur determination and other elemental/ultimate analysis methods; ISO 157 specifically addresses forms of sulfur.

Q: What are the key keywords?

A: Coal, hard coal, sulfur forms, sulfate sulfur, pyritic sulfur, organic sulfur, coal analysis, laboratory methods, Ст ISO 157-1975, Уголь каменный. Определение форм серы.