Liming materials - Determination of the calcium content and magnesium content - Complexometric method

TThis document specifies a complexometric method for the determination of the calcium content and the magnesium content of liming materials.
It is not applicable to products with a mass fraction less than 2 % magnesium or those with a mass fraction more than 1 % P2O5 and is not applicable to silicate liming materials.

Kalkdünger - Bestimmung des Calcium- und Magnesiumgehaltes - Komplexometrisches Verfahren

Dieses Dokument legt ein komplexometrisches Verfahren zur Bestimmung des Calciumgehaltes und des Magnesiumgehaltes von Kalkdüngern fest.
Es ist nicht anwendbar für Produkte mit unter 2 % Massenanteil Magnesium, für Produkte mit über 1 % Massenanteil P2O5 und ist nicht anwendbar für Kalke aus Eisenhüttenschlacken.

Amendements minéraux basiques - Détermination de la teneur en calcium et de la teneur en magnésium - Méthode par complexométrie

Le présent document spécifie une méthode de détermination, par complexométrie, de la teneur en calcium et de la teneur en magnésium des amendements minéraux basiques.
Elle ne s'applique pas aux produits ayant une fraction massique inférieure à 2 % de magnésium, ni aux produits ayant une fraction massique supérieure à 1 % de P2O5, ni aux amendements minéraux basiques silicatés.

Sredstva za apnjenje - Določevanje kalcija in magnezija - Kompleksometrijska metoda

General Information

Status
Published
Publication Date
13-Jun-2023
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Start Date
14-Jun-2023
Due Date
22-Aug-2023
Completion Date
14-Jun-2023

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SLOVENSKI STANDARD
oSIST prEN 12946:2021
01-december-2021
Materiali za apnjenje - Določevanje kalcija in magnezija - Kompleksometrijska
metoda
Liming materials - Determination of the calcium content and magnesium content -
Complexometric method
Kalkdünger ¿ Bestimmung des Calcium- und Magnesiumgehaltes ¿
Komplexometrisches Verfahren
Amendements calciques et/ou magnésiens - Détermination de la teneur en calcium et de
la teneur en magnésium - Méthode par complexométrie
Ta slovenski standard je istoveten z: prEN 12946
ICS:
65.080 Gnojila Fertilizers
oSIST prEN 12946:2021 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN 12946:2021

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oSIST prEN 12946:2021


DRAFT
EUROPEAN STANDARD
prEN 12946
NORME EUROPÉENNE

EUROPÄISCHE NORM

November 2021
ICS 65.080 Will supersede EN 12946:2000
English Version

Liming materials - Determination of the calcium content
and magnesium content - Complexometric method
Amendements calciques et/ou magnésiens - Kalkdünger ¿ Bestimmung des Calcium- und
Détermination de la teneur en calcium et de la teneur Magnesiumgehaltes ¿ Komplexometrisches Verfahren
en magnésium - Méthode par complexométrie
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.


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. prEN 12946:2021 E
worldwide for CEN national Members.

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oSIST prEN 12946:2021
prEN 12946:2021 (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 . 6
7 Sampling . 6
8 Procedure . 7
9 Expression of results . 8
10 Precision . 9
11 Test report . 9
Bibliography . 10

2

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oSIST prEN 12946:2021
prEN 12946:2021 (E)
European foreword
This document (prEN 12946:2021) 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 has been prepared under a standardization request given to CEN by the European
Commission and the European Free Trade Association.
This document will supersede EN 12946:2000 and EN 12946/AC:2002.
In comparison with the previous edition, the following modifications have been made:
a) Normative references updated;
b) Reference to EN 12944-3 added in Clause 3;
c) Principle (Clause 4) updated to recognize the possibility to use automatic titration;
d) Reference updated in Clause 7;
e) Bibliography updated.
3

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oSIST prEN 12946:2021
prEN 12946:2021 (E)
1 Scope
This document specifies a complexometric method for the determination of the calcium content and the
magnesium content of liming materials.
It is not applicable to products with a mass fraction less than 2 % magnesium or those with a mass
fraction more than 1 % P O and is not applicable to silicate liming materials.
2 5
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 459-2, Building lime - Part 2: Test methods
EN 1482-3, Fertilizers and liming materials - Sampling and sample preparation - Part 3: Sampling of
static heaps
EN 12944-3, Fertilizers and liming materials - Vocabulary - Part 3: Terms relating to liming materials
ISO 3310-1, Test sieves — Technical requirements and testing — Part 1: Test sieves of metal wire cloth
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 https://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp
4 Principle
A test portion is extracted with boiling hydrochloric acid solution. After filtration and dilution, an
aliquot portion is titrated against EDTA solution with calcein/thymolphthalein or calcon carbonic acid
as indicator in order to measure calcium. A second aliquot portion is titrated against EDTA with
eriochrome black T as indicator in order to measure calcium and magnesium.
This method can be performed manually or alternatively by means of an automatic titrator as far as
equivalence is proved.
5 Reagents
5.1 General
In principle, commercially available standard solutions may be used instead of standard solutions
produced on-site in the laboratory. Variations in concentration shall be taken into account for the
calculation of the results.
5.2 Hydrochloric acid solution
Density at 20 °C ρ = 1,09 g/ml
20
4

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oSIST prEN 12946:2021
prEN 12946:2021 (E)
Add 1 part by volume of hydrochloric acid (ρ  1,18 g/ml) to 1 part by volume of water.
=
20
5.3 Hydrochloric acid solution
substance concentration c(HCl) ≈ 1 mol/l approximately.
5.4 Hydrochloric acid solution
c(HCl) ≈ 0,5 mol/l approximately.
5.5 Standard calcium solution, containing 2,004 g of calcium per litre
Weigh 5,004 g of dry calcium carbonate into a 500 ml beaker and add 100 ml of water.
Under continuous stirring, slowly add 120 ml of hydrochloric acid solution (5.3).
Drive off the carbon dioxide by boiling, cool and transfer the solution quantitatively into a 1 000 ml
volumetric flask and dilute to the mark with water.
Check the standard strength of the solution by titration with the EDTA standard solution (5.7)
according to 8.3.
1 ml of this solution should contain 2,004 mg of Ca (2,804 mg of CaO) and should correspond to 1 ml of
the EDTA standard solution (5.7).
5.6 Standard magnesium solution, containing 1,216 g of magnesium per litre
5.6.1 Weigh 1,232 g of magnesium sulfate (MgSO ⋅ 7H O) into a 100 ml volumetric flask, dissolve in
4 2
hydrochloric acid solution (5.4) and dilute to the mark with the same solution.
or
5.6.2 Calcined magnesium oxide (MgO) at 600 °C for 2 h.
Weigh 2,016 g of the freshly calcined MgO into a 500 ml beaker, dissolve in 100 ml of water and 120 ml
of hydrochloric acid solution (5.3). Transfer the solution into a 1 000 ml volumetric flask and dilute to
the mark with water.
1 ml of this solution sh
...

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