ISO/PRF 17190-2

INTERNATIONAL ISO
STANDARD 17190-2
Second edition
Urine-absorbing aids for
incontinence — Polyacrylate
superabsorbent powders —
Part 2:
Test method for determination of
the amount of residual acrylate
monomers
Aides pour absorption d'urine — Méthodes d'essai pour caractériser
les matériaux absorbants à base de polymères —
Partie 2: Détermination de la quantité de monomères résiduels
PROOF/ÉPREUVE
Reference number
ISO 17190-2:2020(E)
ISO 2020
---------------------- Page: 1 ----------------------
ISO 17190-2:2020(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2020

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

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

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

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

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

4 Principle ........................................................................................................................................................................................................................ 2

5 Reagents and materials ................................................................................................................................................................................. 2

5.1 Water. ............................................................................................................................................................................................................... 2

5.2 Sodium chloride solution. .............................................................................................................................................................. 2

5.3 Phosphoric acid. ..................................................................................................................................................................................... 2

5.4 Phosphoric acid solution. ............................................................................................................................................................... 2

5.5 Acetonitrile. ............................................................................................................................................................................................... 2

5.6 Acrylic acid. ................................................................................................................................................................................................ 2

6 Apparatus ..................................................................................................................................................................................................................... 3

7 Calibration .................................................................................................................................................................................................................. 4

8 Conditioning .............................................................................................................................................................................................................. 4

9 Sampling ........................................................................................................................................................................................................................ 4

10 Procedure..................................................................................................................................................................................................................... 5

11 Calculation .................................................................................................................................................................................................................. 6

11.1 Calibration curve ................................................................................................................................................................................... 6

11.2 Amount of residual monomers ................................................................................................................................................. 6

12 Report .............................................................................................................................................................................................................................. 7

13 Precision ....................................................................................................................................................................................................................... 7

Annex A (informative) Notes on chromatographical testing ....................................................................................................... 8

Bibliography .............................................................................................................................................................................................................................10

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

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

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

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/

This document was prepared by Technical Committee ISO/TC 173, Assistive products, Subcommittee

This second edition cancels and replaces the first edition (ISO 17190-2:2001), which has been technically

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

WARNING — This document does not claim to address all of the safety concerns, if any, associated

with its use. It is the responsibility of the user of this document to establish appropriate safety

and health practices and determine the applicability of regulatory limitations prior to use. It

is expected that the person performing this test has been fully trained in all aspects of this

This document provides a test method for determining the sum of residual monomeric sodium acrylate

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 187, Paper, board and pulps — Standard atmosphere for conditioning and testing and procedure for

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

product or portion of a product taken from a production lot for testing purposes and identifiable and

Residual monomeric sodium acrylate and acrylic acid are extracted from the polyacrylate

superabsorbent powders and the amount determined as residual acrylate monomer by HPLC.

The method described here uses a simple 1 g in 200 ml dilution factor. However, it is equally valid to

use different masses and volumes as long as the mass: volume dilution ratio is the same and suitable

Grade 1 water according to ISO 3696, for the standard solutions for the calibration and Grade 3 water

according to ISO 3696, with the exception that the conductivity can be as high as 30 μS/cm, for the

5.2.1 0,9 % mass fraction of sodium chloride solution in water. Weigh (9,00 ± 0,01) g of sodium chloride

into a 1 l beaker and add (991,0 ± 0,1) g of deionized water (grade 3). Stir until dissolved.

5.2.2 The conductivity of the solution should be checked prior to each use using properly calibrated

measuring equipment. The expected conductivity of a 0,9 % saline solution is of the order of 1600 S/m

(depending on temperature). Each testing lab shall determine the correct conductivity for the conditions

obtaining in the lab. It is also recommended that the temperature of the solution be maintained at

(23 ± 2) °C for the duration of the test. As this matches the required laboratory temperature it is not

c(H PO ) = 0,1 % by mass (1 g/l or 0,0087 mol/l). Dilute concentrated H PO to volume with deionized

Acrylic acid degrades over time owing to slow polymerization, particularly dimerization, and water

uptake. It is important to obtain acrylic acid that meets the purity required for this test method. It is not

recommended to obtain the reference substance from a laboratory chemicals distributor as the purity

6.1 Analytical balance, capable of weighing a mass of (100,000 ± 0,001) g of polymer powder in

6.2 Analytical balance, capable of weighing a mass of (9,00 ± 0,01) g of sodium chloride in combination

6.3 Analytical balance, capable of weighing a mass of (1000,00 ± 1,00) g of sodium chloride solution