SIST-TS CEN/TS 15477:2006

Fertilizers - Determination of the water-soluble potassium content

This Technical Specification specifies a method for the determination of water-soluble potassium, which is applicable to all potassium fertilizers listed in Annex I of the Regulation (EC) No 2003/2003 [1].

Düngemittel - Bestimmung von wasserlöslichem Kalium

Engrais - Détermination de la teneur en potassium soluble dans l'eau

La présente Spécification Technique spécifie une méthode de détermination de la teneur en potassium soluble dans l'eau, qui s'applique a tous les engrais potassiques énumérés dans l'Annexe I du reglement (CE) N°2003/2003 [1].

Gnojila – Določevanje kalija, topnega v vodi

General Information

• Status: Withdrawn
• Publication Date: 30-Nov-2006
• Withdrawal Date: 11-May-2009
• ICS: 65.080 - Fertilizers
• Technical Committee: KAT - Soil quality
• Current Stage: 9900 - Withdrawal (Adopted Project)
• Start Date: 11-May-2009
• Due Date: 03-Jun-2009
• Completion Date: 12-May-2009
• Mandate: M/335 - Standardization Mandate assigned to the CEN concerning the modernisation of the methods of anylysis of Fertilizers
• Ref Project: CEN/TS 15477:2006 - Fertilizers - Determination of the water-soluble potassium content

Relations

• Replaced By: SIST EN 15477:2009 - Fertilizers - Determination of the water-soluble potassium content
• Effective Date: 01-Jun-2009

Standards Content (Sample)

SLOVENSKI STANDARD
SIST-TS CEN/TS 15477:2006
01-december-2006
*QRMLOD±'RORþHYDQMHNDOLMDWRSQHJDYYRGL
Fertilizers - Determination of the water-soluble potassium content
Düngemittel - Bestimmung von wasserlöslichem Kalium
Engrais - Détermination de la teneur en potassium soluble dans l'eau
Ta slovenski standard je istoveten z: CEN/TS 15477:2006
ICS:
65.080 Gnojila Fertilizers
SIST-TS CEN/TS 15477:2006 en,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------

TECHNICAL SPECIFICATION
CEN/TS 15477
SPÉCIFICATION TECHNIQUE
TECHNISCHE SPEZIFIKATION
September 2006
ICS 65.080

English Version
Fertilizers - Determination of the water-soluble potassium
content
Engrais - Détermination de la teneur en potassium soluble Düngemittel - Bestimmung von wasserlöslichem Kalium
dans l'eau
This Technical Specification (CEN/TS) was approved by CEN on 24 June 2006 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, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania,
Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2006 CEN All rights of exploitation in any form and by any means reserved Ref. No. CEN/TS 15477:2006: E
worldwide for CEN national Members.

---------------------- Page: 2 ----------------------

CEN/TS 15477:2006 (E)
Contents Page
Foreword.3
1 Scope .4
2 Normative references .4
3 Terms and definitions .4
4 Principle.4
5 Reagents.4
6 Apparatus .5
7 Sampling and sample preparation.5
8 Procedure .6
9 Calculation and expression of the result .7
10 Precision.8
11 Test report .9
Annex A (informative) Results of the inter-laboratory tests .10
Bibliography .11

2

---------------------- Page: 3 ----------------------

CEN/TS 15477:2006 (E)
Foreword
This document (CEN/TS 15477:2006) has been prepared by Technical Committee CEN/TC 260 “Fertilizers
and liming materials”, the secretariat of which is held by DIN.
This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to announce this Technical Specification: Austria, Belgium, Cyprus, Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden,
Switzerland and the United Kingdom.
3

---------------------- Page: 4 ----------------------

CEN/TS 15477:2006 (E)
1 Scope
This Technical Specification specifies a method for the determination of water-soluble potassium, which is
applicable to all potassium fertilizers listed in Annex I of the Regulation (EC) No 2003/2003 [1].
2 Normative references
The following referenced documents are indispensable for the application 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.
prEN 1482-2, Fertilizers and liming materials — Sampling and sample preparation — Part 2: Sample
preparation
EN 12944-1:1999, Fertilizers and liming materials — Vocabulary — Part 1: General terms
EN 12944-2:1999, Fertilizers and liming materials — Vocabulary — Part 2: Terms relating to fertilizers
(including corrigendum AC:2000)
EN ISO 3696:1995, Water for analytical laboratory use — Specification and test methods (ISO 3696:1987)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 12944-1:1999 and EN 12944-2:1999
apply.
4 Principle
The potassium in the sample to be analyzed is dissolved in water. After eliminating or fixing the substances
that might interfere with the quantitative determination, the potassium is precipitated in a slightly alkaline
medium in the form of potassium tetraphenylborate.
5 Reagents
5.1 General
Use only reagents of recognized analytical grade and distilled or demineralized water (grade 3 according to
EN ISO 3696:1995).
5.2 Formaldehyde
clear formaldehyde solution with a mass fraction of 25 % to 35 % formaldehyde
5.3 Potassium chloride
p. a.
5.4 Sodium hydroxide solution
c = 10 mol/l
Care should be taken to ensure that only potassium free sodium hydroxide is used.
4

---------------------- Page: 5 ----------------------

CEN/TS 15477:2006 (E)
5.5 Indicator solution
Dissolve 0,5 g of phenolphthalein in ethanol at 90 % and make the volume up to 100 ml.
5.6 EDTA solution
Dissolve 4 g of the dihydrated disodium salt of ethylenediaminetetraacetic acid in water in a 100 ml graduated
flask. Make up the volume and mix.
Store the reagent in a plastics container.
5.7 STPB solution
Dissolve 32,5 g of sodium tetraphenylborate in 480 ml of water, add 2 ml of the sodium hydroxide solution
(5.4) and 20 ml of a magnesium chloride solution (100 g of MgCl 6H O per litre).
2 2
Stir for 15 min and filter through a fine, ashless filter.
Store this reagent in a plastics container.
5.8 Liquid for washing
Dilute 20 ml of the STPB solution (5.7) to 1 000 ml with water.
5.9 Bromine water
saturated bromine solution in water
6 Apparatus
6.1 Graduated flasks
capacity 1 000 ml
6.2 250 ml and 600 ml beaker
6.3 Filter crucibles
porosity 5 µm to 20 µm
6.4 Oven
Regulated at (120 ± 10) °C
6.5 Desiccator
7 Sampling and sample preparation
Sampling is not part of the method specified in this document. A recommended sampling method is given in
prEN 1482-1.
Sample preparation shall be carried out in accordance with prEN 1482-2. Grinding is recommended for
homogeneity reasons.
5

---------------------- Page: 6 ----------------------

CEN/TS 15477:2006 (E)
8 Procedure
8.1 Test portion
We
...