CEN/TS 17768:2022

SLOVENSKI STANDARD
01-februar-2023
Organska in organsko-mineralna gnojila - Razklop z zlatotopko za določevanje
elementov
Organic and organo-mineral fertilizers - Digestion by aqua regia for subsequent
determination of elements
Organische und organisch-mineralische Düngemittel - Aufschluss durch Königswasser
zur anschließenden Bestimmung der Elemente
Engrais organiques et organo-minéraux - Digestion à l'eau régale pour le dosage
ultérieur des éléments
Ta slovenski standard je istoveten z: CEN/TS 17768:2022
ICS:
65.080 Gnojila Fertilizers
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

CEN/TS 17768
TECHNICAL SPECIFICATION
SPÉCIFICATION TECHNIQUE
April 2022
TECHNISCHE SPEZIFIKATION
ICS 65.080
English Version
Organic and organo-mineral fertilizers - Digestion by aqua
regia for subsequent determination of elements
Engrais organiques et organo-minéraux - Digestion à Organische und organisch-mineralische Düngemittel -
l'eau régale pour le dosage ultérieur des éléments Aufschluss durch Königswasser zur anschließenden
Bestimmung der Elemente
This Technical Specification (CEN/TS) was approved by CEN on 13 March 2022 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, Republic of North Macedonia, 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
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. CEN/TS 17768:2022 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 Sampling and sample preparation . 5
6 Reagents . 5
7 Apparatus . 5
8 Procedure. 6
8.1 Sample digestion . 6
8.2 Sample pre-concentration . 7
8.3 Blank . 7
Annex A (informative) Adjustment to different digestion procedures and measurement
apparatuses . 8
A.1 Adjustment of the procedure to different final volumes . 8
A.2 Calculation of the sample mass . 8
A.2.1 General . 8
A.2.2 Calculation of the mass of the sample – dry matter . 9
A.2.3 Calculation of the mass of the sample for analysis . 9
A.2.4 Example . 9
Bibliography . 10

European foreword
This document (CEN/TS 17768:2022) 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.
This document has been prepared under a Standardization Request given to CEN by the European
Commission and the European Free Trade Association.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
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, 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 the United
Kingdom.
Introduction
Aqua regia is applied to digest different matrices for the subsequent determination of many elements.
For example, a multi-matrix standard for aqua regia extraction of soils, sludges and biowaste was
prepared by CEN/TC 444 “Environmental characterization”. A similar procedure was applied for
determination of aqua regia extractable elements according to CEN/TS 17769 and CEN/TS 17770.
CEN/TC 223 “Soil improvers and growing media” published a standard for a similar procedure for soil
improvers and growing media. Wide use of the aqua regia digestion, availability of the instruments and
the possibility to merge the standards for different matrices in the future, were the main reasons for also
applying this method of digestion for organic and organo-mineral fertilizers.
1 Scope
This document specifies the procedure for the digestion of different organic fertilizers and organo-
mineral fertilizers with aqua regia to enable a subsequent determination of elements.
The extracts are suitable for analysis using CEN/TS 17770 and CEN/TS 17769.
NOTE Alternatively, inductively coupled plasma mass spectrometry (ICP-MS) can be used for the measurement
if the user proves that the method gives the same results.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
No terms and definitions are listed in this document.
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
The samples are digested by boiling in aqua regia.
5 Sampling and sample preparation
Sampling should be performed carefully, following the principles described in EN 1482 (all parts) with
appropriate adaptations, required to account for specificities of organic and organo-mineral fertilizers.
6 Reagents
All reagents should be of recognized analytical grade. The reagents and water used shall have negligible
concentrations of the elements to be determined if compared to the lowest concentrations of these
elements in the sample solution.
6.1 Hydrochloric acid 37 % HCl, c(HCl) ≈ 12 mol/l, ρ ≈ 1,18 g/ml.
6.2 Nitric acid 65 %, c(HNO ) ≈ 14,3 mol/l, ρ ≈ 1,4 g/ml.
6.3 Antifoaming agent, e.g. n-dodecane (C H ) or octanol (C H O) are suitabl
...