Brown coals and lignites -- Determination of yield of benzene-soluble extract -- Semi-automatic method

This document specifies a semi-automatic method for determination of the yield of benzene-soluble extract in brown coals and lignites.

Charbons bruns et lignites -- Détermination du rendement en extrait de benzène soluble -- Méthode semi-automatique

General Information

Status
Published
Publication Date
06-Dec-2021
Current Stage
5060 - Close of voting Proof returned by Secretariat
Start Date
10-Nov-2021
Completion Date
09-Nov-2021
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ISO 975:2021 - Brown coals and lignites -- Determination of yield of benzene-soluble extract -- Semi-automatic method
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INTERNATIONAL ISO
STANDARD 975
Fifth edition
2021-12
Brown coals and lignites —
Determination of yield of benzene-
soluble extract — Semi-automatic
method
Charbons bruns et lignites — Détermination du rendement en extrait
de benzène soluble — Méthode semi-automatique
Reference number
ISO 975:2021(E)
© ISO 2021
---------------------- Page: 1 ----------------------
ISO 975:2021(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2021

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

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© ISO 2021 – All rights reserved
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ISO 975:2021(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction .................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ..................................................................................................................................................................................... 1

3 Terms and definitions .................................................................................................................................................................................... 1

4 Principle ........................................................................................................................................................................................................................ 1

5 Reagent ........................................................................................................................................................................................................................... 1

6 Apparatus .................................................................................................................................................................................................................... 1

7 Preparation of sample .................................................................................................................................................................................... 2

8 Preliminary adjustment of instrument ....................................................................................................................................... 2

8.1 Adjustment of the extraction temperature ................................................................................................................... 2

8.2 Selection of periods of extraction, rinsing and evaporation ......................................................................... 2

8.3 Procedure .................................................................................................................................................................................................... 3

9 Calculation and expression of results ........................................................................................................................................... 3

10 Precision ....................................................................................................................................................................................................................... 4

10.1 Repeatability limit ............................................................................................................................................................................... 4

10.2 Reproducibility limit ......................................................................................................................................................................... 4

11 Test report .................................................................................................................................................................................................................. 4

iii
© ISO 2021 – All rights reserved
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ISO 975:2021(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www.iso.org/patents).

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expressions related to conformity assessment, as well as information about ISO's adherence to

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www.iso.org/iso/foreword.html.

This document was prepared by Technical Committee ISO/TC 27, Coal and coke, Subcommittee SC 5,

Methods of analysis.

This fifth edition cancels and replaces the fourth edition (ISO 975:2013), of which it constitutes a minor

revision. The changes compared to the previous edition are as follows:
— referenced documents have been updated;
— terms and definitions have been added;
— sample has been added;
— calculation and expression of results have been amended;
— precision has been amended;
— test report has been amended.

Any feedback or questions on this document should be directed to the user’s national standards body. A

complete listing of these bodies can be found at www.iso.org/members.html
© ISO 2021 – All rights reserved
---------------------- Page: 4 ----------------------
ISO 975:2021(E)
Introduction

The determination of yield of benzene-soluble extract is carried out using a semi-automatic instrument;

a system combining extraction, rinsing and evaporation. As long as the sample is put in the extraction

chamber of the instrument, the test can be done automatically.
© ISO 2021 – All rights reserved
---------------------- Page: 5 ----------------------
INTERNATIONAL STANDARD ISO 975:2021(E)
Brown coals and lignites — Determination of yield of
benzene-soluble extract — Semi-automatic method
1 Scope

This document specifies a semi-automatic method for determination of the yield of benzene-soluble

extract in brown coals and lignites.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

ISO 5068-2, Brown coals and lignites — Determination of moisture content — Part 2: Indirect gravimetric

method for moisture in the analysis sample

ISO 13909-4, Hard coal and coke — Mechanical sampling — Part 4: Coal — Preparation of test samples

ISO 18283, Coal and coke — Manual sampling
3 Terms and definitions
No terms and definitions are listed in this document.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
4 Principle
...

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