CEN/TS 17403:2021

SLOVENSKI STANDARD
01-april-2021
Gnojila - Določevanje v hladni in vroči vodi netopnega dušika, dobljenega s
počasnim sproščanjem iz trdnih gnojil urea formaldehida in metilen uree, in
določevanje topnosti polimernih hranil v raztopini fosfatnega pufra s pH 7,5 pri
100 °C
Fertilizers - Determination of cold water insoluble nitrogen and hot water insoluble
nitrogen in solid urea formaldehyde and methylene urea slow-release fertilizers and
determination of the solubility of nutrient polymers in phosphate buffer solution with a pH
of 7,5 at 100 °C
Düngemittel - Bestimmung von kalt- und heißwasserunlöslichem Stickstoff in festen
langsam freisetzenden Harnstoff-Formaldehyd- und Methylenharnstoff-Düngemitteln
sowie Bestimmung der Löslichkeit von Nährstoffpolymeren in Phosphatpufferlösung mit
einem pH-Wert von 7,5 bei 100 °C
Engrais - Dosage de l'azote insoluble dans l'eau froide et de l'azote insoluble dans l'eau
chaude dans les engrais à libération lente urée-formaldéhyde solides etméthylène-urée,
et détermination de la solubilité des polymères nutritifs dans une solution tampon
phosphate avec un pH de 7,5 à 100°°C
Ta slovenski standard je istoveten z: CEN/TS 17403:2021
ICS:
65.080 Gnojila Fertilizers
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

CEN/TS 17403
TECHNICAL SPECIFICATION
SPÉCIFICATION TECHNIQUE
January 2021
TECHNISCHE SPEZIFIKATION
ICS 65.080
English Version
Fertilizers - Determination of cold water insoluble
nitrogen and hot water insoluble nitrogen in solid urea
formaldehyde and methylene urea slow-release fertilizers
and determination of the solubility of nutrient polymers in
phosphate buffer solution with a pH of 7,5 at 100 °C
Engrais - Dosage de l'azote insoluble dans l'eau froide Düngemittel - Bestimmung von kalt- und
et de l'azote insoluble dans l'eau chaude dans les heißwasserunlöslichem Stickstoff in festen langsam
engrais à libération lente urée-formaldéhyde solides freisetzenden Harnstoff-Formaldehyd- und
etméthylène-urée, et détermination de la solubilité des Methylenharnstoff-Düngemitteln sowie Bestimmung
polymères nutritifs dans une solution tampon der Löslichkeit von Nährstoffpolymeren in
phosphate avec un pH de 7,5 à 100 °C Phosphatpufferlösung mit einem pH-Wert von 7,5 bei
100 °C
This Technical Specification (CEN/TS) was approved by CEN on 30 November 2020 for provisional application.

The period of validity of this CEN/TS is limited initially to three years. After two years the members of CEN will be requested to
submit their comments, particularly on the question whether the CEN/TS can be converted into a European Standard.

CEN members are required to announce the existence of this CEN/TS in the same way as for an EN and to make the CEN/TS
available promptly at national level in an appropriate form. It is permissible to keep conflicting national standards in force (in
parallel to the CEN/TS) until the final decision about the possible conversion of the CEN/TS into an EN is reached.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. CEN/TS 17403:2021 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Sampling and sample preparation . 7
4.1 Sampling of products in bags and in bulk . 7
4.2 Reduction of samples . 7
5 Determination of the mass fraction of CWIN . 7
5.1 Principle . 7
5.2 Reagents . 7
5.3 Apparatus . 7
5.4 Procedure. 7
5.5 Calculation and expression of results . 8
6 Determination of the mass fraction of HWIN . 8
6.1 Principle . 8
6.2 Reagents . 8
6.3 Apparatus . 8
6.4 Procedure. 8
6.5 Calculation and expression of results . 9
7 Determination of the solubility of nutrient polymers in phosphate buffer solution
with a pH of 7,5 at 100 °C . 9
8 Test report . 9
Bibliography . 11

European foreword
This document (CEN/TS 17403:2021) has been prepared by Technical Committee CEN/TC 260
“Fertilizers and liming materials”, the secretariat of which is held by DIN.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
According to the CEN/CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to announce this Technical Specification: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United
Kingdom.
Introduction
Solid urea formaldehyde and methylene urea slow-release fertilizers are non-coated and chemically
synthesized nitrogen fertilizers with slow-release effect. In 1924, the first slow-release fertilizer patent
in the world was issued to urea formaldehyde (UF) and in 1955, UF was put into commercial production
as the oldest slow-release fertilizer.
WARNING — Users of this document should be familiar with normal laboratory practice. This document
does not purport to address all of the safety issues, if any, associated with its use. It is the responsibility
of the user to establish appropriate health and safety practices and to ensure compliance with any
national regulatory conditions.
IMPORTANT — It is absolutely essential that tests conducted according to this document are carried out
by suitably trained staff.
1 Scope
This document specifies a method for the determination of the cold and hot water insoluble nitrogen
content in solid urea formaldehyde and methylene urea slow-release fertilizers and for the determination
of the solubility of nutrient polymers in a phosphate buffer solution with a pH of 7,5 at 100 °C.
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.
EN 1482-2, Fertilizers and liming materials - Sampling and sample preparation - Part 2: Sample
preparation
EN 12944-1, Fertilizers and liming materials and soil improvers - Vocabulary - Part 1: General terms
EN 12944-2, Fertilizers and liming materials and soil improvers - Vocabulary - Part 2: Terms relating to
fertilizers
ISO 5315, Fertilizers — Determination of total nitrogen content — Titrimetric method after distillation
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 12944-1 and EN 12944-2 and
the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
3.1
urea formaldehyde
UF
slow-release nitrogenous fertilizer obtained by the reaction between urea and formaldehyde to produce
molecular chains of general formula NH -CO-NH(CH NHCONH) H
2 2 n
3.2
methylene urea
MU
slow-release nitrogenous fertilizer obtained by the reaction between urea and formaldehyde to produce
oligomers such as MDU (methylendiurea), DMTU (dimethylentriurea), TMTU (trimethylentetraurea),
TMPU (tetramethylenpentaurea) and higher counterparts
3.3
CMC 8 nutrient polymers
component material of EU fertilising products consisting of polymers exclusively made of monomer
substances complying with the criteria set out in points 1 and 2 of CMC 1, where the purpose of the
polymerisation is to control the release of nutrients from one or more of the monomer substances
Note 1 to entry: See [2], Annex II, Part I and Part II.
3.4
CMC 1
component material of EU fertilising products consisting of virgin material substances and mixtures
Note 1 to entry: See [2], Annex II, Part I and Part II.
Note 2 to entry: Excluded are the following products: waste and by-products according to [3], materials formerly
having constituted in waste or by-products, animal by-products or derived products and polymers.
3.5
cold water insoluble nitrogen
CWIN
insoluble nitrogen fractions in urea formaldehyde or methylene urea products that are insoluble in
phosphate buffer solution (pH 7,5) or distilled water at 25 °C during a 15 min period
[SOURCE: ISO 19670:2017 [4], 3.2]
3.6
cold water soluble nitrogen
CWSN
soluble nitrogen fractions in urea formaldehyde or methylene urea products that are soluble in
phosphate buffer solution (pH 7,5) or distilled water at 25 °C during a 15 min period
Note 1 to entry: CWSN = Total nitrogen - CWIN.
[SOURCE: ISO 19670:2017 [4], 3.3]
3.7
hot water insoluble nitrogen
HWIN
insoluble nitrogen fractions in urea formaldehyde or methylene urea products that are insoluble in
phosphate buffer solution (pH 7,5) at 100 °C during a 30 min period
[SOURCE: ISO 19670:2017 [4], 3.4]
3.8
hot water soluble nitrogen
HWSN
soluble nitrogen fractions in urea formaldehyde or methylene urea products and in nutrient polymers
that are soluble in phosphate buffer solution (pH 7,5) at 100 °C during a 30 min period
Note 1 to entry: HWSN = Total nitrogen - HWIN.
[SOURCE: ISO 19670:2017 [4], 3.5, modified – “and in nutrient polymers” has been added to the
definition.]
3.9
hot water soluble nitrogen only
HWSN only
soluble nitrogen fractions in urea formaldehyde or methylene urea products that are soluble in
phosphate buffer solution (pH 7,5) at 100 °C during a 30 min period and insoluble in phosphate buffer
solution (pH 7,5) or distilled water at 25 °C during a 15 min period
Note 1 to entry: HWSN only = HWSN – CWSN = CWIN - HWIN.
[SOURCE: ISO 19670:2017, 3.6]
4 Sampling and sample preparation
4.1 Sampling of products in bags and in bulk
Sampling is not part of the method specified in this document. Recommended sampling methods are
given in EN 1482-1 [1].
4.2 Reduction of samples
Reduction, labelling and sample preparation shall be carried out in accordance with EN 1482-2.
For the size reduction of samples to be used for
...