Fertilizers - Determination of different forms of nitrogen in the same sample, containing nitrogen as nitric, ammoniacal, urea and cyanamide nitrogen (ISO 15604:2016)

ISO 15604:2016 specifies a method for the determination of any one form of nitrogen in the presence of any other form.
The method is applicable to any fertilizer provided for in the Regulation (EC) No 2003/2003, Annex I[2] containing nitrogen in various forms.

Düngemittel - Bestimmung verschiedener, nebeneinander anwesender Stickstoff-Formen in derselben Probe mit Stickstoff in Form von Ammonium, Nitrat, Harnstoff und Cyanamid (ISO 15604:2016)

Engrais - Détermination des différentes formes d'azote dans un même échantillon d'engrais contenant l'azote sous forme nitrique ammoniacale, uréique et cyanamidique (ISO 15604:2016)

La présente Norme internationale spécifie une méthode de détermination d'une forme d'azote quelle qu'elle soit, en présence d'une autre forme, quelle qu'elle soit.
La méthode s'applique à tout engrais indiqué dans l'Annexe I du Règlement (CE) n° 2003/2003[2] contenant de l'azote sous différentes formes.

Gnojila - Določevanje različnih oblik dušika v istem vzorcu, ki vsebuje dušik v nitratni, amonijevi, sečninski in cianoamidni obliki (ISO 15604:2016)

General Information

Status
Not Published
Public Enquiry End Date
03-Jul-2019
Technical Committee
Current Stage
98 - Abandoned project (Adopted Project)
Start Date
20-Aug-2020
Due Date
25-Aug-2020
Completion Date
20-Aug-2020

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SLOVENSKI STANDARD
01-junij-2019
Gnojila - Določevanje različnih oblik dušika v istem vzorcu, ki vsebuje dušik v
nitratni, amonijevi, sečninski in cianoamidni obliki (ISO 15604:2016)
Fertilizers - Determination of different forms of nitrogen in the same sample, containing
nitrogen as nitric, ammoniacal, urea and cyanamide nitrogen (ISO 15604:2016)
Düngemittel - Bestimmung verschiedener, nebeneinander anwesender Stickstoff-
Formen in derselben Probe mit Stickstoff in Form von Ammonium, Nitrat, Harnstoff und
Cyanamid; Deutsche und Englische Fassung prEN ISO 15604:2018
Engrais - Détermination des différentes formes d'azote dans un même échantillon
d'engrais contenant l'azote sous forme nitrique ammoniacale, uréique et cyanamidique
(ISO 15604:2016)
Ta slovenski standard je istoveten z: prEN ISO 15604
ICS:
65.080 Gnojila Fertilizers
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

INTERNATIONAL ISO
STANDARD 15604
First edition
2016-05-01
Fertilizers — Determination of
different forms of nitrogen in the same
sample, containing nitrogen as nitric,
ammoniacal, urea and cyanamide
nitrogen
Engrais — Détermination des différentes formes d’azote dans
un même échantillon contenant l’azote sous forme nitrique,
ammoniacale, uréique et cyanamidique
Reference number
ISO 15604:2016(E)
©
ISO 2016
ISO 15604:2016(E)
© ISO 2016, Published in Switzerland
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ii © ISO 2016 – All rights reserved

ISO 15604:2016(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
4.1 Total soluble and insoluble nitrogen . 1
4.2 Forms of soluble nitrogen. 2
4.2.1 General. 2
4.2.2 Total soluble nitrogen . 2
4.2.3 Total soluble nitrogen with the exception of nitrate nitrogen . 2
4.2.4 Nitrate nitrogen by difference . 2
4.2.5 Ammoniacal nitrogen . 2
4.2.6 Urea nitrogen . 2
4.2.7 Cyanamide nitrogen . 3
5 Reagents . 3
6 Apparatus . 5
7 Sampling and sample preparation .10
8 Procedure.10
8.1 Total soluble and insoluble nitrogen .10
8.1.1 In the absence of nitrates .10
8.1.2 In the presence of nitrate .11
8.2 Forms of soluble nitrogen.12
8.2.1 Preparation of the solution to be analysed .12
8.2.2 Total soluble nitrogen .13
8.2.3 Total soluble nitrogen with the exception of nitrate nitrogen .14
8.2.4 Nitrate nitrogen .14
8.2.5 Ammoniacal nitrogen .15
8.2.6 Urea nitrogen .16
8.2.7 Cyanamide nitrogen .18
9 Verification of the result .18
10 Test report .18
Bibliography .19
ISO 15604:2016(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 on 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 the following URL: www.iso.org/iso/foreword.html.
ISO 15604 was prepared by CEN/TC 260 as EN 15604:2009 and was adopted (without modification
other than those stipulated below) by Technical Committee ISO/TC 134, Fertilizers and soil conditioners.
Modifications were made as follows:
a) 5.2: p.a. = pro analysis = analytical grade;
b) 6.2: add “Refer to Figure 1”.
iv © ISO 2016 – All rights reserved

INTERNATIONAL STANDARD ISO 15604:2016(E)
Fertilizers — Determination of different forms of nitrogen
in the same sample, containing nitrogen as nitric,
ammoniacal, urea and cyanamide nitrogen
1 Scope
This International Standard specifies a method for the determination of any one form of nitrogen in the
presence of any other form.
[2]
The method is applicable to any fertilizer provided for in the Regulation (EC) No 2003/2003, Annex I
containing nitrogen in various forms.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
ISO 3696, Water for analytical laboratory use — Specification and test methods
ISO 14820-2, Fertilizers and liming materials — Sampling and sample preparation — Part 2: Sample
preparation
ISO 25475, Fertilizers — Determination of ammoniacal nitrogen
EN 12944-1, Fertilizers and liming materials — Vocabulary — Part 1: General terms
EN 12944-2, Fertilizers and liming materials — Vocabulary — Part 2: Terms relating to fertilizers
EN 15562, Fertilizers — Determination of cyanamide nitrogen
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 12944-1 and EN 12944-2 apply.
4 Principle
4.1 Total soluble and insoluble nitrogen
[2]
According to the list of standard fertilizers given in Regulation (EC) No 2003/2003, Annex I, this
determination is applicable to products containing calcium cyanamide.
In the absence of nitrates, the test sample is mineralized by direct Kjeldahl digestion.
In the presence of nitrates, the test sample is mineralized by Kjeldahl digestion after reduction with the
aid of metallic iron and stannous chloride.
In both cases, the ammonia is determined according to ISO 25475.
NOTE If analysis shows an insoluble nitrogen content of more than 0,5 %, one concludes that the fertilizer
[2]
contains other forms of insoluble nitrogen not included in the list in Regulation (EC) No 2003/2003, Annex I.
ISO 15604:2016(E)
4.2 Forms of soluble nitrogen
4.2.1 General
The forms of soluble nitrogen referred to in 4.2.2 to 4.2.7 are determined from different aliquots taken
from the same solution of the test sample.
4.2.2 Total soluble nitrogen
4.2.2.1 In the absence of nitrates, by direct Kjeldahl digestion. The ammonia is then determined (by
the same method as that described in ISO 25475).
4.2.2.2 In the presence of nitrates, by Kjeldahl digestion on an aliquot part taken from the solution after
reduction according to Ulsch. The ammonia is then determined (by the same method as that described in
ISO 25475).
4.2.3 Total soluble nitrogen with the exception of nitrate nitrogen
By Kjeldahl digestion after elimination in an acid medium of nitrate nitrogen with ferrous sulfate. The
ammonia is then determined (by the same method as that described in ISO 25475).
4.2.4 Nitrate nitrogen by difference
4.2.4.1 In the absence of calcium cyanamide, by determining the difference between the nitrogen
determined as summarized in 4.2.2.2 and that determined as summarized in 4.2.3 or between total soluble
nitrogen (see 4.2.2) and the sum of ammoniacal nitrogen and ureic organic nitrogen (4.2.5 + 4.2.6).
4.2.4.2 In the presence of calcium cyanamide, by determining the difference between the nitrogen
determined as summarized in 4.2.2.2 and that determined as summarized in 4.2.3 or between the
nitrogen determined as summarized in 4.2.2.2 and the sum of that determined as summarized in 4.2.5,
4.2.6 and 4.2.7.
4.2.5 Ammoniacal nitrogen
4.2.5.1 Solely in the presence of ammoniacal nitrogen and ammoniacal plus nitrate nitrogen, according
to ISO 25475.
4.2.5.2 In the presence of urea nitrogen and/or cyanami
...

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