CEN/TS 16197:2011

SLOVENSKI STANDARD
01-oktober-2011
*QRMLOD'RORþHYDQMHPDJQH]LMD]DWRPVNRDEVRUSFLMVNRVSHNWURPHWULMR
Fertilizers - Determination of magnesium by atomic absorption spectrometry
Düngemittel - Bestimmung von Magnesium mit Atomabsorptionsspektrometrie
Engrais - Dosage du magnésium par spectrométrie d'absorption atomique
Ta slovenski standard je istoveten z: CEN/TS 16197:2011
ICS:
65.080 Gnojila Fertilizers
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

TECHNICAL SPECIFICATION
CEN/TS 16197
SPÉCIFICATION TECHNIQUE
TECHNISCHE SPEZIFIKATION
June 2011
ICS 65.080
English Version
Fertilizers - Determination of magnesium by atomic absorption
spectrometry
Engrais - Dosage du magnésium par spectrométrie Düngemittel - Bestimmung von Magnesium mit
d'absorption atomique Atomabsorptionsspektrometrie
This Technical Specification (CEN/TS) was approved by CEN on 5 March 2011 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, 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: Avenue Marnix 17, B-1000 Brussels
© 2011 CEN All rights of exploitation in any form and by any means reserved Ref. No. CEN/TS 16197:2011: E
worldwide for CEN national Members.

Contents Page
Foreword .3
1 Scope .4
2 Normative references .4
3 Terms and definitions .4
4 Principle .4
5 Sampling .5
6 Reagents .5
7 Apparatus .5
8 Preparation of the extraction solution .5
9 Procedure .6
9.1 Preparation of the test solution .6
9.2 Preparation of the blank solution .6
9.3 Preparation of the calibration solutions .6
9.4 Measurement .6
10 Calculation and expression of the result .6
11 Precision .7
11.1 Inter-laboratory test .7
11.2 Repeatability .7
11.3 Reproducibility .7
12 Test report .8
Annex A (informative) Statistical results of the inter-laboratory test .9
Bibliography . 11

Foreword
This document (CEN/TS 16197:2011) 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 [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
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, Bulgaria, Croatia, 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.
1 Scope
This Technical Specification specifies a method for the determination of the magnesium content in fertilizer
extracts using atomic absorption spectrometry (AAS).
This method is applicable to EC fertilizer extracts obtained according to CEN/TS 15960 and CEN/TS 15961,
for which a declaration of the total magnesium and/or water soluble magnesium content is required, with the
exceptions of the following fertilizers according to [4], Annex I D relating to secondary nutrients:
 type 4 (kieserite);
 type 5 (magnesium sulfate) and type 5.1 (magnesium sulfate solution);
 type 7 (kieserite with potassium sulfate)
to which [4], method 8.8, applies.
NOTE Method 8.8 is covered by CEN/TS 16198 (see Bibliography).
The method applies to all fertilizer extracts containing elements in quantities that might interfere with the
complexometric determination of magnesium.
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.
EN 1482-2, Fertilizers and liming materials — Sampling and sample preparation — Part 2: Sample
preparation
EN 12944-1:1999, Fertilizers and liming materials and soil improvers — Vocabulary — Part 1: General terms
EN 12944-2:1999, Fertilizers and liming materials and soil improvers — Vocabulary — Part 2: Terms relating
to fertilizers
CEN/TS 15960, Fertilizers — Extraction of total calcium, total magnesium, total sodium and total sulfur in the
forms of sulfates
CEN/TS 15961, Fertilizers — Extraction of water soluble calcium, magnesium, sodium and sulfur in the form
of sulfates
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
Determination of magnesium by atomic absorption spectrometry (AAS) after appropriate dilution of the extract.
5 Sampling
Sampling is not part of the method specified in this document. A recommended sampling method is given in
EN 1482-1.
Sample preparation shall be carried out in accordance with EN 1482-2. Grinding of the laboratory sample is
recommended for homogeneity reasons.
6 Reagents
6.1 Hydrochloric acid solution, c = 1 mol/l.
6.2 Hydrochloric acid solution, c = 0,5 mol/l.
6.3 Standard solution of magnesium, ρ = 1,00 mg/ml.
6.3.1 Preferably use a commercially available certified stock solution of magnesium.
6.3.2 Dissolve 1,013 g of magnesium sulfate (MgSO , 7H O) in hydrochloric acid solution (6.2), transfer
4 2
quantitatively into a graduated flask (7.3) and make up the volume with the same acid and mix.
6.3.3 Weigh 1,658 g of m
...