SIST-TS CEN/TS 17338:2019

SLOVENSKI STANDARD
01-julij-2019
Sredstva za apnjenje - Določanje potrebe po apnjenju tal - Metoda z amonijevim
acetatnim pufrom pH 5,5
Liming materials - Determination of the lime requirement in soil - Ammonium acetate
buffer method pH 5,5
Kalkdünger - Bestimmung des Kalkbedarfs in Böden - Ammoniumazetat Pufferverfahren
pH 5
Amendements minéraux basiques - Détermination du besoin en bases d'un sol -
Méthode tampon d'acétate d'ammonium pH 5,5
Ta slovenski standard je istoveten z: CEN/TS 17338:2019
ICS:
65.080 Gnojila Fertilizers
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

CEN/TS 17338
TECHNICAL SPECIFICATION
SPÉCIFICATION TECHNIQUE
May 2019
TECHNISCHE SPEZIFIKATION
ICS 65.080
English Version
Liming materials - Determination of the lime requirement
in soil - Ammonium acetate buffer method pH 5,5
Amendements minéraux basiques - Détermination du Kalkdünger - Bestimmung des Kalkbedarfs von Böden -
besoin en chaux d'un sol - Méthode tampon d'acétate Ammoniumacetat-Pufferverfahren pH 5,5
d'ammonium pH 5,5
This Technical Specification (CEN/TS) was approved by CEN on 15 March 2019 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, 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
© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. CEN/TS 17338:2019 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 Principle . 5
5 Reagents . 5
6 Apparatus . 6
7 Preparation of the test portion . 6
8 Procedure and determination . 6
9 Calculation and expression of the results . 7
10 Test report . 8
Annex A (informative) Regression equations to predict the maintenance of a range of
pH levels at different times after liming in mineral and organic soils in Europe . 9
A.1 General . 9
A.2 Regression equations for mineral soils. 9
A.3 Regression equations for organic soils (more than 40 % organic matter by mass) . 10
Bibliography . 12

European foreword
This document (CEN/TS 17338:2019) 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, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Introduction
pH target levels for liming of soils depend on soil types, crops to be grown and regional climatic
conditions.
When pH targets have been fixed under each condition, this buffer method can be used, in addition to
determine total soil acidity, to predict the amount of an effective liming material to be used to achieve
this required lime status, irrespective of soil type. The buffer method will reveal the buffering capacity
of any soil prior to its admixture of a liming material.
1 Scope
This document specifies a method for the determination of the lime requirement of acid soils to target
pH levels at requested time of maintenance as determined by reaction with 0,1 mol/l ammonium
acetate pH 5,5.
Due to general soil buffering systems, the method is applicable to all soils which are acid enough to
dissociate hydrogen ions from the soil colloid system to depress the pH of the buffer solution.
NOTE 1 The method originates from research in Canada and Norway, see [1] and [2].
NOTE 2 Annex A gives regression equations to predict the maintenance of a range of pH levels at different
times after liming in mineral and organic soils in Europe.
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 12944-3, Fertilizers and liming materials - Vocabulary - Part 3: Terms relating to liming materials
EN ISO 3696, Water for analytical laboratory use - Specification and test methods (ISO 3696)
EN ISO 11272, Soil quality - Determination of dry bulk density (ISO 11272)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 12944-3 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 http://www.iso.org/obp/
4 Principle
The acidity of a test portion of the soil sample is liberated by reaction with an aliquot of ammonium
acetate pH 5,5, corresponding to the immediate lime requirement to achieve soil neutrality or another
defined pH target. To determine the lime requirement in the field the density of the soil is measured
simultaneously in the laboratory.
5 Reagents
All reagents shall be of recognized analytical grade unless otherwise stated.
5.1 Water, grade 3 according to EN ISO 3696.
5.2 Hydrochloric acid solution, c = 0,1 mol/l.
5.3 Sodium hydroxide solution, c = 0,1 mol/l.
5.4 Ammonium acetate solution, c = 0,1 mol/l, with a molecular mass of 77,082 5 g.
Weigh 19,27 g into a 2,5 l beaker and add 2 l of water (5.1). Measure the pH, and if necessary adjust to
pH 5,50 by adding hydrochloric acid (5.2) or sodium hydroxide (5.3). Transfer to a 2,5 l volumetric
flask, rinse the walls of the beaker, and dilute to the mark.
This solution has a l
...