ISO 19043:2023
(Main)Natural rubber latex concentrate — Determination of total phosphate content by spectrophotometric method
Natural rubber latex concentrate — Determination of total phosphate content by spectrophotometric method
This document specifies a method for the determination of total phosphate content of natural rubber latex concentrate. This method is not necessarily suitable for latex from natural sources other than the Hevea brasiliensis.
Concentré de latex de caoutchouc naturel — Détermination de la teneur totale en phosphate par méthode spectrophotométrique
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INTERNATIONAL ISO
STANDARD 19043
Second edition
2023-05
Natural rubber latex concentrate —
Determination of total phosphate
content by spectrophotometric
method
Concentré de latex de caoutchouc naturel — Détermination de la
teneur totale en phosphate par méthode spectrophotométrique
Reference number
ISO 19043:2023(E)
© ISO 2023
---------------------- Page: 1 ----------------------
ISO 19043:2023(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2023
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
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
© ISO 2023 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 19043:2023(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Apparatus . 1
6 Reagents . 2
7 Procedure .2
7.1 General . 2
7.2 Determination of total solids content . 2
7.3 Preparation of standard phosphate solutions . 2
7.4 Determination of phosphate content . 3
8 Expression of results . 3
9 Precision data .4
10 Test report . 4
Annex A (informative) Precision data . 5
Bibliography . 7
iii
© ISO 2023 – All rights reserved
---------------------- Page: 3 ----------------------
ISO 19043:2023(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 document 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).
ISO draws attention to the possibility that the implementation of this document may involve the use
of (a) patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed
patent rights in respect thereof. As of the date of publication of this document, ISO had not received
notice of (a) patent(s) which may be required to implement this document. However, implementers are
cautioned that this may not represent the latest information, which may be obtained from the patent
database available at www.iso.org/patents. ISO shall not be held responsible for identifying any or all
such patent rights.
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 45, Rubber and rubber products,
Subcommittee SC 3, Raw materials (including latex) for use in the rubber industry.
This second edition cancels and replaces the first edition (ISO 19043:2015), which has been technically
revised.
The main changes are as follows:
— the CAS numbers of the chemicals have been added;
— in 6.4, the requirement for potassium dihydrogen phosphate (stock solution) has been changed to
include both the commercially available standard solution and the prepared one;
— in 7.1, "The difference between two readings” has been changed into "The difference between the
results of duplicate determinations";
— in Clause 8, “Report the result as the mean of the duplicate determinations" has been added;
— in Annex A, the precision data have been updated by the results of an ITP evaluated in accordance
with ISO 19983.
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 2023 – All rights reserved
---------------------- Page: 4 ----------------------
INTERNATIONAL STANDARD ISO 19043:2023(E)
Natural rubber latex concentrate — Determination of total
phosphate content by spectrophotometric method
WARNING — Persons using this document should be familiar with normal laboratory practice.
This document does not purport to address all of the safety problems, if any, associated with its
use. It is the responsibility of the user to establish appropriate safety and health practices.
1 Scope
This document specifies a method for the determination of total phosphate content of natural rubber
latex concentrate. This method is not necessarily suitable for latex from natural sources other than the
Hevea brasiliensis.
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 124, Latex, rubber — Determination of total solids content
ISO 648, Laboratory glassware — Single-volume pipettes
3 Terms and definitions
No terms and definitio
...
ISO/FDIS 19043:2023(E)
Style Definition: Heading 1: Indent: Left: 0 pt, First
line: 0 pt, Tab stops: Not at 21.6 pt
ISO TC 45/SC 3/WG 2
Style Definition: Heading 2: Font: Bold, Tab stops: Not
Date: 2022-12-262023-xx
at 18 pt
Secretariat: AFNOR
Style Definition: Heading 3: Font: Bold
Natural rubber latex concentrate — Determination of total phosphate content by
Style Definition: Heading 4: Font: Bold
spectrophotometric method
Style Definition: Heading 5: Font: Bold
Concentré de latex de caoutchouc naturel — Détermination de la teneur totale en phosphate par méthode
Style Definition: Heading 6: Font: Bold
spectrophotométrique
Style Definition: ANNEX
Style Definition: AMEND Terms Heading: Font: Bold
Style Definition: AMEND Heading 1 Unnumbered:
Font: Bold
Formatted: Font: Not Bold, Italic
---------------------- Page: 1 ----------------------
ISO/FDIS 19043:20222023(E)
© ISO 20222023
Formatted: Pattern: Clear
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
Email: copyright@iso.org
Website: www.iso.orgwww.iso.org
Published in Switzerland
ii © ISO 20222023 – All rights reserved
---------------------- Page: 2 ----------------------
ISO/FDIS 19043:20222023(E)
Contents
Foreword . iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Apparatus . 1
6 Reagents . 1
7 Procedure . 2
7.1 General . 2
7.2 Determination of total solids content . 2
7.3 Preparation of standard phosphate solutions . 2
7.4 Determination of phosphate content . 3
8 Expression of results . 3
9 Precision data . 4
10 Test report . 4
Annex A (informative) Precision data . 5
Bibliography . 7
Foreword . iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Apparatus . 1
6 Reagents . 1
7 Procedure . 2
7.1 General . 2
7.2 Determination of total solids content . 2
7.3 Preparation of standard phosphate solutions . 2
7.4 Determination of phosphate content . 3
8 Expression of results . 3
9 Precision data . 4
10 Test report . 4
Annex A (informative) Precision data . 5
Bibliography . 7
© ISO 20222023 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO/FDIS 19043:20222023(E)
iv © ISO 20222023 – All rights reserved
---------------------- Page: 4 ----------------------
ISO/FDIS 19043:20222023(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/directiveswww.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/patentswww.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.htmlwww.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 45, Rubber and rubber products,
Subcommittee SC 3, Raw materials (including latex) for use in the rubber industry.
This second edition cancels and replaces the first edition (ISO 19043:2015), which has been technically
Formatted: Pattern: Clear
revised.
Formatted: Pattern: Clear
Formatted: Pattern: Clear
The main changes are as follows:
— the CAS numbers of the chemicals have been added;
— in 6.4, the requirement for potassium dihydrogen phosphate (stock solution) has been changed to
Formatted: Pattern: Clear
include both the commercially available standard solution and the prepared one;
— in 7.1, "The difference between two readings” has been changed into "The difference between the
Formatted: Pattern: Clear
results of duplicate determinations";
— in Clause 8, “Report the result as the mean of the duplicate determinations" has been added;
Formatted: Pattern: Clear
— in Annex A, the precision data have been updated by the results of an ITP evaluated in accordance
Formatted: Pattern: Clear
with ISO 19983:2017.
Formatted: Pattern: Clear
Formatted: Pattern: Clear
© ISO 20222023 – All rights reserved v
---------------------- Page: 5 ----------------------
ISO/FDIS 19043:20222023(E)
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.htmlwww.iso.org/members.html.
vi © ISO 20222023 – All rights reserved
---------------------- Page: 6 ----------------------
FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 19043:2023(E)
Natural rubber latex concentrate — Determination of total
phosphate content by spectrophotometric method
WARNING — Persons using this document should be familiar with normal laboratory practice. This
document does not purport to address all of the safety problems, if any, associated with its use. It is the
responsibility of the user to establish appropriate safety and health practices.
1 Scope
This document specifies a method for the determination of total phosphate content of natural rubber
latex concentrate. This method is not necessarily suitable for latex from natural sources other than the
Hevea brasiliensis.
2 Norm
...
FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 19043
ISO/TC 45/SC 3
Natural rubber latex concentrate —
Secretariat: AFNOR
Determination of total phosphate
Voting begins on:
2023-02-15 content by spectrophotometric
method
Voting terminates on:
2023-04-12
Concentré de latex de caoutchouc naturel — Détermination de la
teneur totale en phosphate par méthode spectrophotométrique
RECIPIENTS OF THIS DRAFT ARE INVITED TO
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
THEY ARE AWARE AND TO PROVIDE SUPPOR TING
DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/FDIS 19043:2023(E)
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN-
DARDS TO WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS. © ISO 2023
---------------------- Page: 1 ----------------------
ISO/FDIS 19043:2023(E)
FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 19043
ISO/TC 45/SC 3
Natural rubber latex concentrate —
Secretariat: AFNOR
Determination of total phosphate
Voting begins on:
content by spectrophotometric
method
Voting terminates on:
Concentré de latex de caoutchouc naturel — Détermination de la
teneur totale en phosphate par méthode spectrophotométrique
COPYRIGHT PROTECTED DOCUMENT
© ISO 2023
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.
RECIPIENTS OF THIS DRAFT ARE INVITED TO
ISO copyright office
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
CP 401 • Ch. de Blandonnet 8
THEY ARE AWARE AND TO PROVIDE SUPPOR TING
CH-1214 Vernier, Geneva
DOCUMENTATION.
Phone: +41 22 749 01 11
IN ADDITION TO THEIR EVALUATION AS
Reference number
Email: copyright@iso.org
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO
ISO/FDIS 19043:2023(E)
Website: www.iso.org
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
Published in Switzerland
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN
DARDS TO WHICH REFERENCE MAY BE MADE IN
ii
© ISO 2023 – All rights reserved
NATIONAL REGULATIONS. © ISO 2023
---------------------- Page: 2 ----------------------
ISO/FDIS 19043:2023(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Apparatus . 1
6 Reagents . 2
7 Procedure .2
7.1 General . 2
7.2 Determination of total solids content . 2
7.3 Preparation of standard phosphate solutions . 2
7.4 Determination of phosphate content . 3
8 Expression of results . 3
9 Precision data .4
10 Test report . 4
Annex A (informative) Precision data . 5
Bibliography . 7
iii
© ISO 2023 – All rights reserved
---------------------- Page: 3 ----------------------
ISO/FDIS 19043:2023(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 nongovernmental, 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 45, Rubber and rubber products,
Subcommittee SC 3, Raw materials (including latex) for use in the rubber industry.
This second edition cancels and replaces the first edition (ISO 19043:2015), which has been technically
revised.
The main changes are as follows:
— the CAS numbers of the chemicals have been added;
— in 6.4, the requirement for potassium dihydrogen phosphate (stock solution) has been changed to
include both the commercially available standard solution and the prepared one;
— in 7.1, "The difference between two readings” has been changed into "The difference between the
results of duplicate determinations";
— in Clause 8, “Report the result as the mean of the duplicate determinations" has been added;
— in Annex A, the precision data have been updated by the results of an ITP evaluated in accordance
with ISO 19983.
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 2023 – All rights reserved
---------------------- Page: 4 ----------------------
FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 19043:2023(E)
Natural rubber latex concentrate — Determination of total
phosphate content by spectrophotometric method
WARNING — Persons using this document should be familiar with normal laboratory practice.
This document does not purport to address all of the safety problems, if any, associated with its
use. It is the responsibility of the user to establish appropriate safety and health practices.
1 Scope
This document specifies a method for the determination of total phosphate content of natural rubber
latex concentrate. This method is not necessarily suitable for latex from natural sources other than the
Hevea brasiliensis.
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
...
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