oSIST prEN 898:2020

SLOVENSKI STANDARD
01-julij-2020
Kemikalije, ki se uporabljajo za pripravo pitne vode - Natrijev hidrogen karbonat
Chemicals used for treatment of water intended for human consumption - Sodium
hydrogen carbonate
Produkte zur Aufbereitung von Wasser für den menschlichen Gebrauch -
Natriumhydrogencarbonat
Produits chimiques utilisés pour le traitement de l'eau destinée à la consommation
humaine - Hydrogénocarbonate de sodium
Ta slovenski standard je istoveten z: prEN 898
ICS:
13.060.20 Pitna voda Drinking water
71.100.80 Kemikalije za čiščenje vode Chemicals for purification of
water
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2020
ICS 71.100.80 Will supersede EN 898:2012
English Version
Chemicals used for treatment of water intended for human
consumption - Sodium hydrogen carbonate
Produits chimiques utilisés pour le traitement de l'eau Produkte zur Aufbereitung von Wasser für den
destinée à la consommation humaine - menschlichen Gebrauch - Natriumhydrogencarbonat
Hydrogénocarbonate de sodium
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 164.
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
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 898:2020 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and defintions . 5
4 Description . 5
4.1 Identification . 5
4.2 Commercial forms . 6
4.3 Physical properties . 6
4.4 Chemical properties . 7
5 Purity criteria . 7
5.1 General . 7
5.2 Composition of commercial product . 7
5.3 Impurities and main by-products . 7
5.4 Chemical parameters . 8
6 Test methods . 8
6.1 Sampling . 8
6.2 Analyses . 8
7 Labelling – Transportation – Storage . 10
7.1 Means of delivery . 10
7.2 Labelling according to the EU legislation . 10
7.3 Transportation regulations and labelling . 10
7.4 Marking . 10
7.5 Storage . 10
Annex A (informative) General information on sodium hydrogen carbonate . 11
Annex B (normative) Analytical methods . 13
Bibliography . 19

European foreword
This document (prEN 898:2020) has been prepared by Technical Committee CEN/TC 164 “Water supply”,
the secretariat of which is held by AFNOR.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 898:2012.
In comparison with the previous edition, the following technical modifications have been made:
a) Modification of 7.3 on transportation regulations and labelling, adding the sentence “The user must be
aware of the incompatibilities between transported products.”;
b) Modification of 7.4 on marking. The requirements of marking are also applied to the accompanying
documents.
Introduction
In respect of potential adverse effects on the quality of water intended for human consumption, caused by
the product covered by this document:
a) this document 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 document 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 document is subject to regulation or control
by National Authorities.
1 Scope
This document is applicable to sodium hydrogen carbonate used for the treatment of water intended for
human consumption. It describes the characteristics and specifies the requirements and the corresponding
test methods for sodium hydrogen carbonate. It gives information on its use in water treatment.
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 ISO 3696, Water for analytical laboratory use — Specification and test methods (ISO 3696:1987)
EN ISO 12846:2012, Water quality — Determination of mercury — Method using atomic absorption
spectrometry (AAS) with and without enrichment (ISO 12846:2012)
ISO 746, Sodium carbonate for industrial use — Determination of matter insoluble in water at 50 degrees C
ISO 2199, Sodium hydrogen carbonate for industrial use — Determination of sodium hydrogen carbonate
content — Titrimetric method
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 Terms and defintions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at https://www.electropedia.org/
4 Description
4.1 Identification
4.1.1 Chemical name
Sodium hydrogen carbonate.
4.1.2 Synonym or common name
Sodium bicarbonate, bicarbonate of soda, baking soda.
4.1.3 Relative molecular mass
84,01.
4.1.4 Empirical formula
NaHCO .
4.1.5 Chemical formula
NaHCO .
3.
1)
4.1.6 CAS Registry Number
144-55-8.
2)
4.1.7 EINECS reference
205-633-8.
4.2 Commercial forms
The product is available as powder or crystals.
4.3 Physical properties
4.3.1 Appearance
The product is a white powder or crystals, slightly hygroscopic.
4.3.2 Density
The density of this product is 2,2 g/cm .
3 3
The bulk density is ranging from 0,5 kg/dm to 1,1 kg/dm .
4.3.3 Solubility in water
The product is soluble at 95 g/l at 20 °C.
4.3.4 Vapour pressure
Not applicable.
3)
4.3.5 Boiling point at 100 kPa
Not applicable.
1)
Chemical Abstracts Service Registry Number.
2)
European Inventory of Existing Commercial Chemical Substances.
3)
100 kPa = 1 bar.
4.3.6 Melting point
Not applicable .The product decomposes at 50 °C.
4.3.7 Specific heat
1,197 J/(kg K).
4.3.8 Viscosity (dynamic)
Not applicable.
4.3.9 Critical temperature
Not applicable.
4.3.10 Critical pressure
Not applicable.
4.3.11 Physical hardness
The hardness of solid sodium hydrogen carbonate is given as 1,5 to 2 on the Mohs' scale of hardness.
4.4 Chemical properties
Sodium hydrogen carbonate as specified is technical water-free NaHCO .
Sodium hydrogen carbonate reacts exothermically with acids with formation of carbon dioxide. For
additional information on sodium hydrogen carbonate, see Annex A.
5 Purity criteria
5.1 General
This document specifies the minimum purity requirements for sodium hydrogen 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 The national regulations allow to users to clarify whether the product is of appropriate purity for the
treatment of water intended for human consumption, taking into account raw water quality, required dosage, contents
of other impurities and additives used in the product and 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.
5.2 Composition of commercial product
The product shall contain not less than a mass fraction of 98,5 % of NaHCO .
5.3 Impurities and main by-products
The product shall conform to the requirements specified in Table 1.
The concentration limits refer to pure NaHCO .
Table 1 — Impurities
Impurity  Limit
in mg/kg of NaHCO
a max. 5
Iron (II)
b max. 200
Insoluble matters
a
Iron(II) can cause organoleptic problems.
b
Indicate the presence of foreign matter.
5.4 Chemical parameters
The product shall conform to the requirements specified in Table 2.
Table 2 — Chemical parameters
Parameter  Limit in
mg/kg of NaHCO
Arsenic (As) max. 2
Cadmium (Cd) max. 2
Chromium (Cr) max. 2
Mercury (Hg) max. 0,1
Nickel (Ni) max. 2
Lead (Pb) max. 2
NOTE  Antimony, selenium, cyanides, pesticides and polycyclic
aromatic hydrocarbons a
...