Inorganic fertilizers - Determination of cyanamide nitrogen

This document specifies a method for the determination of cyanamide nitrogen in fertilizers. The method is applicable to calcium cyanamide and mixtures of calcium cyanamide with calcium nitrate.

Anorganische Düngemittel - Bestimmung des Cyanamidstickstoffs

Dieses Dokument legt ein Verfahren zur Bestimmung von Cyanamidstickstoff in Düngemitteln fest. Das Verfahren ist auf Calciumcyanamid und Gemische aus Calciumcyanamid und Calciumnitrat anwendbar.

Engrais inorganiques - Dosage de l'azote cyanamidé

Le présent document spécifie une méthode de dosage de l’azote cyanamidé dans les engrais. La méthode est applicable à la cyanamide calcique et aux mélanges de cyanamide calcique avec du nitrate de calcium.

Gnojila - Določevanje cianoamidnega dušika

General Information

Publication Date
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Start Date
Due Date
Completion Date


Buy Standard

prEN 15562:2021
English language
13 pages
sale 10% off
sale 10% off
e-Library read for
1 day

Standards Content (Sample)

oSIST prEN 15562:2021
Gnojila - Določevanje cianoamidnega dušika
Fertilizers - Determination of cyanamide nitrogen
Düngemittel - Bestimmung des Cyanamidstickstoffs
Engrais - Détermination de l'azote cyanamidé
Ta slovenski standard je istoveten z: prEN 15562
65.080 Gnojila Fertilizers
oSIST prEN 15562:2021 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
oSIST prEN 15562:2021

---------------------- Page: 2 ----------------------
oSIST prEN 15562:2021

prEN 15562


November 2021
ICS 65.080 Will supersede EN 15562:2009
English Version

Fertilizers - Determination of cyanamide nitrogen
Engrais - Détermination de l'azote cyanamidé Düngemittel - Bestimmung des Cyanamidstickstoffs
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 260.

If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations
which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC
Management Centre has the same status as the official versions.

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.

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 supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.



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. prEN 15562:2021 E
worldwide for CEN national Members.

---------------------- Page: 3 ----------------------
oSIST prEN 15562:2021
prEN 15562:2021 (E)
Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Principle . 4
5 Reagents . 4
6 Apparatus and equipment . 5
Figure 1 — Distillation apparatus 1 . 6
Figure 2 — Distillation apparatus 2 . 7
Figure 3 — Distillation apparatus 3 . 8
Figure 4 — Distillation apparatus 4 . 9
7 Sampling and sample preparation . 10
8 Procedure . 10
8.1 Preparation of the solution for analysis . 10
8.1 Analysis of the solution . 10
Table 1 — Weighing, dilution and calculation . 11
8.2 Blank test . 11
8.3 Control test . 11
9 Calculation and expression of the result . 12
10 Test report . 12
Bibliography . 13


---------------------- Page: 4 ----------------------
oSIST prEN 15562:2021
prEN 15562:2021 (E)
European foreword
This document (prEN 15562:2021) has been prepared by Technical Committee CEN/TC 260 “Fertilizers
and liming materials”, the secretariat of which is held by DIN.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 15562:2009.
In comparison with the previous edition, the following technical modifications have been made:
— technical changes have been made to the description of the procedure (8) and to Table 1 (8.2).

---------------------- Page: 5 ----------------------
oSIST prEN 15562:2021
prEN 15562:2021 (E)
1 Scope
This document specifies a method for the determination of cyanamide nitrogen in fertilizers. The method
is applicable to calcium cyanamide and mixtures of calcium cyanamide with calcium nitrate.
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
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
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 12944-1 and EN 12944-2 apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
• IEC Electropedia: available at
• ISO Online browsing platform: available at
4 Principle
Precipitation of cyanamide nitrogen as a silver complex. Digestion in sulfuric acid with the aid of a
catalyst. Distillation of the ammonia from an alkaline solution, absorption in an excess of standard sulfuric
acid solution and back-titration with standard sodium or potassium hydroxide solution.
5 Reagents
Use only reagents of recognized analytical grade and distilled or demineralized water, free from carbon
dioxide and all nitrogenous compounds (grade 3 according to EN ISO 3696:1995).
5.1 Glacial acetic acid.
5.2 Ammonia solution, containing 10 % of ammonia gas by mass, density at 20 °C ρ = 0,96 g/ml).
5.3 Ammoniacal silver solution, according to Tollens.
Mix 500 ml of 10 % silver nitrate (AgNO ) solution in water with 500 ml of 10 % ammonia solution (5.2).
Do not expose unnecessarily to light, heat or air. The solution normally keeps for years. As long as the
solution remains clear, the reagent is of good quality.
5.4 Concentrated sulfuric acid, ρ = 1,84 g/ml.
5.5 Potassium sulfate, analytical grade.
5.6 Catalyst.

---------------------- Page: 6 ----------------------
oSIST prEN 15562:2021
prEN 15562:2021 (E)
Use 0,3 g to 0,4 g of copper(II) oxide or 0,95 g to 1,25 g of copper(II) sulfate pentahydrate for each
5.7 Sodium hydroxide solution, approximately 30 % NaOH, ρ = 1,33 g/ml), ammonia free.
5.8 Sulfuric acid, molar concentration c = 0,05 mol/l.
5.9 Sodium or potassium hydroxide solution, c = 0,1 mol/l.
5.10 Indicator solutions.
5.10.1 Mixed indicator.
Solution A: Dissolve 1 g of methyl red in 37 ml of sodium hydroxide solution c = 0,1 mol/l (5.9) and make
up to 1 l with water.
Solution B: Dissolve 1 g of methylene blue in water and make up to 1 l.
Mix one volume of solution A with two volumes of solution B.
This indicator is violet in acid solution, grey in neutral solution and green in alkaline solution. Use 0,5 ml
(10 drops) of this indicator solution.
5.10.2 Methyl red indicator solution.
Dissolve 0,1 g of methyl red in 50 ml of 95 % ethanol. Make up to 100 ml with water and filter if necessary.
This indicator may be used (4 to 5 drops) instead of that specified in 5.10.1.
5.11 Anti-bump granules (i.e. pumice stone, glass pearls), washed in hydrochloric acid and calcined.
5.12 Potassium thiocyanate, (mass fraction w = 14,4 %), analytical grade.
6 Apparatus and equipment
Usual laboratory glassware and equipment and, in particular, the following.
6.1 Distillation apparatus, consisting of a round-bottomed flask of

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.