ISO 17190-10:2020

DRAFT INTERNATIONAL STANDARD
ISO/DIS 17190-10
ISO/TC 173/SC 3 Secretariat: SIS
Voting begins on: Voting terminates on:
2019-08-15 2019-11-07
Urine-absorbing aids for incontinence — Polyacrylate
superabsorbent powders —
Part 10:
Test method for determination of extractable polymer
content by potentiometric titration
Aides pour absorption d'urine — Méthodes d'essai pour caractériser les matériaux absorbants à base de
polymères —
Partie 10: Détermination de la teneur en polymère extractible par titrage potentiométrique
ICS: 11.180.20
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ISO/DIS 17190-10:2019(E)
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PROVIDE SUPPORTING DOCUMENTATION. ISO 2019

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ISO/DIS 17190-10:2019(E)

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ISO/DIS 17190-10:2019(E)

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
5 Reagents and Materials . 2
6 Apparatus . 3
7 Conditioning . 4
8 Sampling . 4
9 Procedure. 4
10 Calculation . 5
11 Report . 6
12 Precision . 7
Annex A (informative) Modification Track Sheet . 8
Bibliography . 9
© ISO 2019 – All rights reserved iii

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ISO/DIS 17190-10:2019(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
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This second/third/… edition cancels and replaces the first/second/… edition (ISO #####:####), which
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DRAFT INTERNATIONAL STANDARD ISO/DIS 17190-10:2019(E)
Urine-absorbing aids for incontinence — Polyacrylate
superabsorbent powders —
Part 10:
Test method for determination of extractable polymer
content by potentiometric titration
1 Scope
This test method is used to determine the mass fraction of soluble polymers present in crosslinked
polyacrylate superabsorbent powders that may be extracted into saline solution.
NOTE - This standard 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 standard 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 procedure.
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 187, Paper, board and pulps — Standard atmosphere for conditioning and testing and procedure for
monitoring the atmosphere and conditioning of samples
ISO 3696, Water for analytical laboratory use — Specification and test methods
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
acid groups
carboxylic acid group
3.2
extractables
sum of the soluble acid and salt groups of monomeric, oligomeric and polymeric carboxylates extracted
from the superabsorbent polymer
3.3
salt group
Alkali metal salt of carboxylic acid group also referred to as neutralized carboxylic acid or carboxylate
© ISO 2019 – All rights reserved 1

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ISO/DIS 17190-10:2019(E)

3.4
sample
product or portion of a product taken from a production lot for testing purposes and identifiable and
traceable back to its origin
3.5
specimen
specific portion of the identified sample upon which a test is performed
4 Principle
The amount of extractable polymer in polyacrylate superabsorbent powders is determined by mixing
the polymer in saline solution for 1 hour. The resulting saline suspension is filtered in its entirety
through a paper filter of <12-µm pore size. An aliquot of the filtrate is titrated against a standard
base solution (NaOH) to pH 10.0 to determine the concentration of free carboxylic acid groups. The
resulting solution is then back-titrated against a standard acid solution (HCI) to pH 2.7 to determine
the concentration of neutralised carboxylate groups. The titration data are used to calculate the total
amount of extractables present in the superabsorbent powder.
5 Reagents and Materials
Use only reagents of recognized analytical grade, unless otherwise specified.
5.1 Water
Grade 3 water according to ISO 3696, with the exception that the conductivity can be as high as 30 μS/cm.
5.2 Sodium hydroxide solution
c(NaOH) = 0.1 mol/l. Obtained as ready-made analytical grade solution.
5.3 Hydrochloric acid solution
c(HCl) = 0.1 mol/l. Obtained as ready-made analytical grade solution.
5.4 Sodium Chloride solution
5.4.1 0.9% by mass (m/m) Weigh 9.00 ± 0.01 g of sodium chloride into a 1 l beaker and add 991.0 ± 0.1
g of deionised water (grade 3). Stir until dissolved.
5.4.2 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 16mS/cm at
25 °C. Each testing lab must 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.
5.5 Standard buffer solutions
Prepare 3 buffer solutions according to ISO 10523 (or equivalent national standards) with pH values
suitable to work in a range from pH 2,7 till pH 10. For instance
— 3.0 ± 0.02
— 7.0 ± 0.02
— 10.0 ± 0.02
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ISO/DIS 17190-10:2019(E)

6 Apparatus
6.1 Analytical balance capable of weighing a mass of 1.000 ± 0.001 g of polymer powder in
combination with the mass of the weighing vessel
...