SIST EN 897:2013

SLOVENSKI STANDARD
SIST EN 897:2013
01-maj-2013
1DGRPHãþD
SIST EN 897:2005
Kemikalije, ki se uporabljajo za pripravo pitne vode - Natrijev karbonat
Chemicals used for treatment of water intended for human consumption - Sodium
carbonate
Produkte zur Aufbereitung von Wasser für den menschlichen Gebrauch -
Natriumcarbonat
Produits chimiques utilisés pour le traitement de l’eau destinée à la consommation
humaine - Carbonate de sodium
Ta slovenski standard je istoveten z: EN 897:2012
ICS:
13.060.20 Pitna voda Drinking water
71.100.80 .HPLNDOLMH]DþLãþHQMHYRGH Chemicals for purification of
water
SIST EN 897:2013 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 897:2013

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SIST EN 897:2013


EUROPEAN STANDARD
EN 897

NORME EUROPÉENNE

EUROPÄISCHE NORM
November 2012
ICS 71.100.80 Supersedes EN 897:2005
English Version
Chemicals used for treatment of water intended for human
consumption - Sodium carbonate
Produits chimiques utilisés pour le traitement de l'eau Produkte zur Aufbereitung von Wasser für den
destinée à la consommation humaine - Carbonate de menschlichen Gebrauch - Natriumcarbonat
sodium
This European Standard was approved by CEN on 16 September 2012.

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. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member.

This European Standard exists 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United
Kingdom.





EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2012 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 897:2012: E
worldwide for CEN national Members.

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SIST EN 897:2013
EN 897:2012 (E)
Contents Page
Foreword .3
Introduction .4
1 Scope .5
2 Normative references .5
3 Description .5
4 Purity criteria .7
5 Test methods .8
6 Labelling – Transportation – Storage . 10
Annex A (informative) General information on sodium carbonate . 12
Annex B (normative) Analytical methods . 13
Annex C (normative) General rules relating to safety . 19
Bibliography . 20

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SIST EN 897:2013
EN 897:2012 (E)
Foreword
This document (EN 897:2012) has been prepared by Technical Committee CEN/TC 164 “Water supply”, the
secretariat of which is held by AFNOR.
This European Standard shall be given the status of a national standard, either by publication of an identical text or
by endorsement, at the latest by May 2013, and conflicting national standards shall be withdrawn at the latest by
May 2013.
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 supersedes EN 897:2005.
Significant technical differences between this edition and EN 897:2005 are as follows:
a) Modification of 6.2 on labelling, deletion of the reference to EU Directive 80/778/EEC of 15 July 1980 in order
to take account of the latest Directive in force.
According to the CEN/CENELEC Internal Regulations, the national standards organisations of the following
countries are bound to implement this European Standard: 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, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.
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SIST EN 897:2013
EN 897:2012 (E)
Introduction
In respect of potential adverse effects on the quality of water intended for human consumption, caused by the
product covered by this European Standard:
a) this European Standard provides no information as to whether the product may be used without restriction in
any of the Member States of the EU or EFTA;
b) it should be noted that, while awaiting the adoption of verifiable European criteria, existing national regulations
concerning the use and/or the characteristics of this product remain in force.
NOTE Conformity with this European Standard does not confer or imply acceptance or approval of the product in any of
the Member States of the EU or EFTA. The use of the product covered by this European Standard is subject to regulation or
control by National Authorities.

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EN 897:2012 (E)
1 Scope
This European Standard is applicable to sodium carbonate used for treatment of water intended for human
consumption. It describes the characteristics and specifies the requirements and the corresponding test methods
for sodium carbonate. It gives information on its use in water treatment. It also determines the rules relating to safe
handling and use (see Annex C).
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for
its application. For dated references, only the edition cited applies. For undated references, the latest edition of the
referenced document (including any amendments) applies.
EN ISO 3696, Water for analytical laboratory use — Specification and test methods (ISO 3696)
EN ISO 12846:2012, Water quality — Determination of mercury — Method using atomic absorption spectrometry
(AAS) with and without enrichment (ISO 12846:2012)
ISO 740, Sodium carbonate for industrial use — Determination of total soluble alkalinity —Titrimetric method
ISO 746, Sodium carbonate for industrial use — Determination of matter insoluble in water at 50 degrees C
ISO 2460, Sodium hydrogen carbonate for industrial use — Determination of iron content — 1,10-Phenanthroline
photometric method
ISO 3165, Sampling of chemical products for industrial use — Safety in sampling
ISO 6206, Chemical products for industrial use — Sampling — Vocabulary
ISO 8213, Chemical products for industrial use — Sampling techniques — Solid chemical products in the form of
particles varying from powders to coarse lumps
3 Description
3.1 Identification
3.1.1 Chemical name
Sodium carbonate.
3.1.2 Synonym or common name
Soda ash, anhydrous sodium carbonate, light soda ash, heavy soda ash.
3.1.3 Relative molecular mass
105,99.
3.1.4 Empirical formula
Na CO
2 3.
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EN 897:2012 (E)
3.1.5 Chemical formula
Na CO
2 3.
1)
3.1.6 CAS Registry Number
497-19-8.
2)
3.1.7 EINECS reference
207-838-8.
3.2 Commercial forms
The product is available as dry powder or fine granules and is described as light soda ash or heavy soda ash
according to bulk density (see 3.3.2).
3.3 Physical properties
3.3.1 Appearance
The product is a white powder or crystals, slightly hygroscopic.
3.3.2 Density
3
The density of this product is 2,53 g/cm .
The bulk density is:
3 3
ranging from 0,5 kg/dm to 0,65 kg/dm (light soda ash);
3 3
ranging from 0,8 kg/dm to 1,2 kg/dm (heavy soda ash).
3.3.3 Solubility in water
The product is soluble at 212 g/l at 20 °C.
3.3.4 Vapour pressure
Not applicable.
3)
3.3.5 Boiling point at 100 kPa
Not applicable.
3.3.6 Melting point
851 °C.

1) Chemical Abstracts Service Registry Number.
2) European Inventory of Existing Commercial Chemical Substances.
3) 100 kPa = 1 bar.
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3.3.7 Specific heat
1,043 J/(kg K).
3.3.8 Viscosity (dynamic)
Not applicable.
3.3.9 Critical temperature
Not applicable.
3.3.10 Critical pressure
Not applicable.
3.3.11 Physical hardness
The hardness of solid sodium carbonate is given as 1 to 2 on the Mohs' scale of hardness.
3.4 Chemical properties
Sodium carbonate reacts exothermically with acids with the formation of carbon dioxide.
Sodium carbonate is slightly hygroscopic and dissolution in water is an exothermic reaction.
4 Purity criteria
4.1 General
This European Standard specifies the minimum purity requirements for sodium carbonate used for the treatment of
water intended for human consumption. Limits are given for impurities commonly present in the product. Depending
on the raw material and the manufacturing process other impurities may be present and, if so, this shall be notified
to the user and when necessary to relevant authorities.
NOTE Users of this product should check the national regulations in order to clarify whether it is of appropriate purity for
treatment of water intended for human consumption, taking into account raw water quality, required dosage, contents of other
impurities and additives used in the products not stated in this product standard.
Limits have been given for impurities and chemical parameters where these are likely to be present in significant
quantities from the current production process and raw materials. If the production process or raw materials leads
to significant quantities of impurities, by-products or additives being present, this shall be notified to the user.
4.2 Composition of commercial product
The product shall contain not less than a mass fraction of 99 % of Na CO .
2 3
4.3 Impurities and main by-products
The product shall conform to the requirements specified in Table 1.
The concentration limits refer to pure Na CO .
2 3

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EN 897:2012 (E)
Table 1 — Impurities
Impurity Limit
 in mg/kg of Na CO
2 3
1)
Iron(II)
max. 20
2)
Insoluble matters
max. 200
1) Iron(II) can cause organoleptic problems.
2) Indicate the presence of foreign matter.

4.4 Chemical parameters
The product shall conform to the requirements specified in Table 2.
Table 2 — Chemical parameters

Limit in

Parameter mg/kg of Na CO
2 3

2
Arsenic (As) max.
2
Cadmium (Cd) max.
2
Chromium (Cr) max.
0,1
Mercury (Hg) max.
2
Nickel (Ni) max.
2
Lead (Pb) max.


NOTE Antimony, selenium, cyanides, pesticides and polycyclic
aromatic hydrocarbons are not relevant in sodium carbonate. For
parametric values of sodium carbonate on trace metal content in
drinking water, see [1].

5 Test methods
5.1 Sampling
Prepare the laboratory sample (s) required by the relevant procedure described in ISO 8213, observe the
recommendations of ISO 3165 and also take into account ISO 6206.
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5.2 Analyses
5.2.1 Main product
The mass fraction in % of Na CO shall be determined by titration of the total alkalinity with a standard volumetric
2 3
acid solution in accordance with ISO 740.
5.2.2 Impurities
5.2.2.1 Iron
The iron content shall be determined by a spectrometric method with 1,10-phenanthroline in accordance with
ISO 2460 replacing sodium bicarbonate by sodium carbonate.
5.2.2.2 Insoluble matters
The mass fraction in % of the insoluble matter in water shall be determined at 50 °C in accordance with ISO 746.
5.2.3 Chemical parameters
5.2.3.1 Principle
The elements arsenic, cadmium, chromium, lead and nickel are determined by inductively coupled plasma optical
emission spectrometry. Mercury is determined by cold vapour atomic absorption spectrometry.
5.2.3.2 Arsenic
The arsenic content shall be determined by inductively coupled plasma optical emission spectrometry (ICP/OES)
(see B.1).
5.2.3.3 Cadmium
The cadmium content shall be determined by inductively coupled plasma optical emission spectrometry (ICP/OES)
(see B.1).
5.2.3.4 Chromium
The chromium content shall be det
...