SIST ISO 5647:2020

INTERNATIONAL ISO
STANDARD 5647
Second edition
2019-05
Paper and board — Determination of
titanium dioxide content
Papier et carton — Détermination de la teneur en dioxyde de titane
Reference number
ISO 5647:2019(E)
©
ISO 2019

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ISO 5647:2019(E)

COPYRIGHT PROTECTED DOCUMENT
© ISO 2019
All rights reserved. Unless otherwise specified, or required in the context of its implementation, 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.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2019 – All rights reserved

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ISO 5647:2019(E)

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Reagents . 2
6 Apparatus . 2
7 Selection of the sample . 3
8 Preparation of ash solution . 3
9 Reagent blank solution . 3
10 Spectrophotometric procedure . 3
10.1 Preparation of the calibration graph . 3
10.2 Preparation of the test solutions . 4
10.3 Spectrophotometric determination . 4
11 Flame atomic absorption spectrophotometric procedure . 4
11.1 Preparation of the calibration graph . 4
11.1.1 Preparation of the calibration solution . 4
11.1.2 Adjustment of apparatus . 4
11.1.3 Reagent blank determination . 5
11.1.4 Spectrophotometric measurement . 5
11.1.5 Plotting the calibration graph . 5
11.2 Determination . 5
11.2.1 Preparation of test solution . 5
11.2.2 Spectrophotometric measurement . 5
12 Expression of results . 5
13 Test report . 6
© ISO 2019 – All rights reserved iii

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ISO 5647:2019(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 of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to
the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see
www .iso .org/iso/foreword .html.
This document was prepared by Technical Committee ISO/TC 6, Paper, Board and Pulps.
This second edition cancels and replaces the first edition (ISO 5647:1990), of which it constitutes a
minor revision. The changes compared to the previous edition are as follows:
— Clause 4: The option of using Inductively Coupled Plasma/Atomic Emission Spectrometry (ICP/AES)
has been added.
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.
iv © ISO 2019 – All rights reserved

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INTERNATIONAL STANDARD ISO 5647:2019(E)
Paper and board — Determination of titanium dioxide
content
WARNING — The method specified in this document involves the use of some hazardous
chemicals and of gases that can form explosive mixtures with air. Care shall be taken to ensure
that the relevant safety precautions are observed.
1 Scope
This document specifies a method for determining titanium dioxide content in all kinds of paper and
board, in particular coated or filled products. It comprises two procedures for the final determination
of titanium, one of them relying on spectrophotometry and the other on flame atomic absorption
spectrophotometry. The limits of the determination depend on the amount of sample taken (8.1).
NOTE The method is designed for the determination of titanium dioxide. Titanium present in other forms,
for example as a constituent of clay, will not interfere in the determination.
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 186, Paper and board — Sampling to determine average quality
ISO 287, Paper and board — Determination of moisture content of a lot — Oven-drying method
ISO 2144, Paper, board, pulps and cellulose nanomaterials — Determination of residue (ash content) on
ignition at 900 °C
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
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 http: //www .electropedia .org/
3.1
titanium dioxide content
titanium dioxide content of paper or board (expressed on an oven-dry basis), determined after ashing
the sample and dissolving the ash by the method specified in this document
4 Principle
Titanium dioxide is determined by ashing the sample and dissolution of the ash in sulphuric acid
and ammonium sulphate. Determination of the titanium by spectrophotometry, applying hydrogen
peroxide, or by flame atomic absorption spectrophotometry, adding potassium chloride.
The determination of titanium, after ashing the sample and dissolution of the ash, can also be done by
ICP/AES (Inductively Coupled Plasma/Atomic Emission Spectrometry) provided that the results have
been validated.
© ISO 2019 – All rights reserved 1

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ISO 5647:2019(E)

5 Reagents
During the analysis, unless otherwise stated, use only reagents of recognized analytical grade and only
distilled water or water of equivalent purity (5.1).
5.1 Dist
...

SLOVENSKI STANDARD
oSIST ISO 5647:2020
01-oktober-2020
Papir, karton in lepenka - Določanje vsebnosti titanovega dioksida
Paper and board -- Determination of titanium dioxide content
Papier et carton -- Détermination de la teneur en dioxyde de titane
Ta slovenski standard je istoveten z: ISO 5647:2019
ICS:
85.060 Papir, karton in lepenka Paper and board
oSIST ISO 5647:2020 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST ISO 5647:2020

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oSIST ISO 5647:2020
INTERNATIONAL ISO
STANDARD 5647
Second edition
2019-05
Paper and board — Determination of
titanium dioxide content
Papier et carton — Détermination de la teneur en dioxyde de titane
Reference number
ISO 5647:2019(E)
©
ISO 2019

---------------------- Page: 3 ----------------------
oSIST ISO 5647:2020
ISO 5647:2019(E)

COPYRIGHT PROTECTED DOCUMENT
© ISO 2019
All rights reserved. Unless otherwise specified, or required in the context of its implementation, 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.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2019 – All rights reserved

---------------------- Page: 4 ----------------------
oSIST ISO 5647:2020
ISO 5647:2019(E)

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Reagents . 2
6 Apparatus . 2
7 Selection of the sample . 3
8 Preparation of ash solution . 3
9 Reagent blank solution . 3
10 Spectrophotometric procedure . 3
10.1 Preparation of the calibration graph . 3
10.2 Preparation of the test solutions . 4
10.3 Spectrophotometric determination . 4
11 Flame atomic absorption spectrophotometric procedure . 4
11.1 Preparation of the calibration graph . 4
11.1.1 Preparation of the calibration solution . 4
11.1.2 Adjustment of apparatus . 4
11.1.3 Reagent blank determination . 5
11.1.4 Spectrophotometric measurement . 5
11.1.5 Plotting the calibration graph . 5
11.2 Determination . 5
11.2.1 Preparation of test solution . 5
11.2.2 Spectrophotometric measurement . 5
12 Expression of results . 5
13 Test report . 6
© ISO 2019 – All rights reserved iii

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oSIST ISO 5647:2020
ISO 5647:2019(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 of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to
the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see
www .iso .org/iso/foreword .html.
This document was prepared by Technical Committee ISO/TC 6, Paper, Board and Pulps.
This second edition cancels and replaces the first edition (ISO 5647:1990), of which it constitutes a
minor revision. The changes compared to the previous edition are as follows:
— Clause 4: The option of using Inductively Coupled Plasma/Atomic Emission Spectrometry (ICP/AES)
has been added.
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.
iv © ISO 2019 – All rights reserved

---------------------- Page: 6 ----------------------
oSIST ISO 5647:2020
INTERNATIONAL STANDARD ISO 5647:2019(E)
Paper and board — Determination of titanium dioxide
content
WARNING — The method specified in this document involves the use of some hazardous
chemicals and of gases that can form explosive mixtures with air. Care shall be taken to ensure
that the relevant safety precautions are observed.
1 Scope
This document specifies a method for determining titanium dioxide content in all kinds of paper and
board, in particular coated or filled products. It comprises two procedures for the final determination
of titanium, one of them relying on spectrophotometry and the other on flame atomic absorption
spectrophotometry. The limits of the determination depend on the amount of sample taken (8.1).
NOTE The method is designed for the determination of titanium dioxide. Titanium present in other forms,
for example as a constituent of clay, will not interfere in the determination.
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 186, Paper and board — Sampling to determine average quality
ISO 287, Paper and board — Determination of moisture content of a lot — Oven-drying method
ISO 2144, Paper, board, pulps and cellulose nanomaterials — Determination of residue (ash content) on
ignition at 900 °C
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
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 http: //www .electropedia .org/
3.1
titanium dioxide content
titanium dioxide content of paper or board (expressed on an oven-dry basis), determined after ashing
the sample and dissolving the ash by the method specified in this document
4 Principle
Titanium dioxide is determined by ashing the sample and dissolution of the ash in sulphuric acid
and ammonium sulphate. Determination of the titanium by spectrophotometry, applying hydrogen
peroxide, or by flame atomic absorption spectrophotometry, adding potassium chloride.
The determination of titanium, after ashing the sample and dissolution of the ash, can also be done by
ICP/AES (Inductive
...