Cotton fibres -- Test method for sugar content -- Spectrophotometry

ISO 18068:2014 specifies a test method to determine the total sugar content in cotton fibres. Spectrophotometry is used as a quantitative determination method, and 3,5-dihydroxytoluene-sulfuric acid solution is used as a colour developer. ISO 18068:2014 is applicable to cotton fibres.

Fibres de coton -- Méthode d'essai pour la teneur en sucre -- Spectrophotométrie

General Information

Status
Published
Publication Date
23-Jul-2014
Current Stage
9093 - International Standard confirmed
Start Date
04-Feb-2021
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ISO 18068:2014 - Cotton fibres -- Test method for sugar content -- Spectrophotometry
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INTERNATIONAL ISO
STANDARD 18068
First edition
2014-08-15
Cotton fibres — Test method for sugar
content — Spectrophotometry
Fibres de coton — Méthode d’essai pour la teneur en sucre —
Spectrophotométrie
Reference number
ISO 18068:2014(E)
ISO 2014
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ISO 18068:2014(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2014

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form

or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior

written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of

the requester.
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Published in Switzerland
ii © ISO 2014 – All rights reserved
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ISO 18068:2014(E)
Contents Page

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

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

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

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

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

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

5 Apparatus ..................................................................................................................................................................................................................... 1

6 Reagents ........................................................................................................................................................................................................................ 2

7 Sampling ........................................................................................................................................................................................................................ 3

8 Procedure..................................................................................................................................................................................................................... 3

8.1 Blank test ..................................................................................................................................................................................................... 3

8.2 Calibration curve preparation ................................................................................................................................................... 3

8.3 Determination of sugar content for test specimens ................................................................................................ 4

9 Calculation and expression of the results .................................................................................................................................. 4

10 Test report ................................................................................................................................................................................................................... 4

© ISO 2014 – All rights reserved iii
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ISO 18068:2014(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).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation on the meaning of ISO specific terms and expressions related to conformity

assessment, as well as information about ISO’s adherence to the WTO principles in the Technical Barriers

to Trade (TBT) see the following URL: Foreword - Supplementary information.

The committee responsible for this document is ISO/TC 38, Textiles, Subcommittee SC 23, Fibres and

yarns.
iv © ISO 2014 – All rights reserved
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ISO 18068:2014(E)
Introduction

Cotton fibre with normal sugar content might not affect the spinning process. If the sugar content is too

high, it might cause storage mildew and metamorphism. During the spinning process, it might also cause

twining and breakage, and lower yarn quality and production efficiency. Spectrophotometry is used as a

quantitative determination method to detect the total sugar content, and 3,5-dihydroxytoluene-sulfuric

acid solution is used as the colour developer. This International Standard supplies the basic information

for sugar content of cotton fibres.
© ISO 2014 – All rights reserved v
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INTERNATIONAL STANDARD ISO 18068:2014(E)
Cotton fibres — Test method for sugar content —
Spectrophotometry

WARNING — The use of this International Standard might involve the use of hazardous materials,

operations, and equipment. This International Standard does not purport to address all the safety

risks associated with its use. It is the responsibility of the user of this International Standard

to establish appropriate safety and health practices and determine the applicability of local

regulatory limitations prior to use.
1 Scope

This International Standard specifies a test method to determine the total sugar content in cotton fibres.

Spectrophotometry is used as a quantitative determination method, and 3,5-dihydroxytoluene-sulfuric

acid solution is used as a colour developer. This International Standard is applicable to cotton fibres.

2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and are

indispensable for its application. For dated references, only the edition cited applies. For undated

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

ISO 139:2005, Textiles — Standard atmospheres for conditioning and testing
ISO 1130:1975, Textile fibres — Some methods of samp
...

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