SIST EN 936:2014

• Abstract:

  This European Standard is applicable to carbon dioxide used for treatment of water intended for human consumption. It describes the characteristics of carbon dioxide and specifies the requirements and corresponding analytical methods for carbon dioxide. It also gives information on its use in water treatment.

• Status: Published
• Publication Date: 02-Jan-2014
• ICS: 13.060.20 - Drinking water
• ICS: 71.100.80 - Chemicals for purification of water
• Technical Committee: IOVO - Water supply and waste water engineering
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 23-Dec-2013
• Due Date: 27-Feb-2014
• Completion Date: 03-Jan-2014
• Directive: TP262 - Uredba o pitni vodi
• Ref Project: EN 936:2013 - Chemicals used for treatment of water intended for human consumption - Carbon dioxide

• Replaces: SIST EN 936:2007 - Chemicals used for treatment of water intended for human consumption - Carbon dioxide
• Effective Date: 01-Feb-2014
• Referred By: SIST EN 15513:2014 - Chemicals used for treatment of swimming pool water - Carbon dioxide
• Effective Date: 28-Jan-2026
• Referred By: SIST EN 15513:2008 - Chemicals used for treatment of swimming pool water - Carbon dioxide
• Effective Date: 28-Jan-2026
• Revises: oSIST prEN 936:2021 - Chemicals used for treatment of water intended for human consumption - Carbon dioxide
• Effective Date: 18-Jan-2023
• Revised: oSIST prEN 936:2021 - Chemicals used for treatment of water intended for human consumption - Carbon dioxide
• Effective Date: 01-Apr-2021

Overview

EN 936:2013 (CEN) defines quality, testing and information requirements for carbon dioxide (CO2) used in the treatment of water intended for human consumption. The standard describes CO2 identity and physical/chemical properties, sets minimum purity criteria (commercial product CO2 ≥ 99.9 %), lists likely impurities and by‑products with limits, and specifies recommended sampling and analytical methods, labelling, transportation and storage information. EN 936:2013 supersedes EN 936:2006 and is intended for use across CEN member states.

Key Topics and Requirements

• Identification: chemical name (carbon dioxide), CAS 124-38-9, relative molecular mass 44.011, EINECS 204-696-9.
• Commercial form: supplied as pressurised liquefied or refrigerated pressurised gas.
• Physical properties: colourless gas/liquid; solubility ~1.72 g/L in water at 20 °C; critical temperature 31 °C; critical pressure 7 383 kPa.
• Purity criteria: minimum CO2 content ≥ 99.9 % (volume fraction).
• By‑products / impurity limits (examples from the standard):
  • Moisture ≤ 50 × 10^-6 (volume fraction) (mass fraction ≤ 20 × 10^-6)
  • Oxygen ≤ 30 × 10^-6 (volume fraction)
  • Ammonia ≤ 2.5 × 10^-6 (volume fraction)
  • Oxides of nitrogen (NO/NO2) ≤ 2.5 × 10^-6 each
  • Carbon monoxide ≤ 10 × 10^-6; methanol ≤ 10 × 10^-6
  • Benzene ≤ 0.02 × 10^-6; acetaldehyde ≤ 0.2 × 10^-6
  • Total sulfur (as S) ≤ 0.1 × 10^-6 (with species-specific limits if exceeded)
  • Taste and odour: acceptable to consumers, no abnormal change.
• Analytical methods: recommended sampling per ISBT guidelines; CO2 determination by absorption in KOH (Orsat/Zahm equipment) or gas chromatography; impurities assessed by appropriate analytical techniques.
• Labelling, transport and storage: updated regulatory and marking requirements; guidance on safe handling and storage included.

Applications and Who Uses EN 936:2013

• Water utilities and treatment plant operators: selecting and verifying CO2 quality for pH adjustment, alkalinity control and carbonation in drinking water treatment.
• CO2 producers and gas suppliers: specification, testing, labelling and documentation for CO2 marketed for potable water use.
• Laboratories and QA teams: sampling and analytical procedures to confirm compliance with purity and impurity limits.
• Regulators and public health authorities: assessing conformity and advising on national approvals and restrictions (standard does not itself constitute regulatory approval).

Related Standards and References

• Cites EU Directives (e.g., Directive 2008/84/EC; indicators from Directive 98/83/EC) and ISBT guidance (Carbon Dioxide Quality Guidelines, Analytical Procedure Bibliography).
• EN 936:2013 replaces EN 936:2006; users should check national regulations in addition to the European Standard.

EN 936:2013 is an essential reference for ensuring safe, compliant use of CO2 for water treatment, combining chemical specification, analytical methodology and practical handling guidance.

SLOVENSKI STANDARD
01-februar-2014
1DGRPHãþD
SIST EN 936:2007
Kemikalije, ki se uporabljajo za pripravo pitne vode - Ogljikov dioksid
Chemicals used for treatment of water intended for human consumption - Carbon dioxide
Produkte zur Aufbereitung von Wasser für den menschlichen Gebrauch -
Kohlenstoffdioxid
Produits chimiques utilisés pour le traitement de l'eau destinée à la consommation
humaine - Dioxyde de carbone
Ta slovenski standard je istoveten z: EN 936:2013
ICS:
13.060.20 Pitna voda Drinking water
71.100.80 .HPLNDOLMH]DþLãþHQMHYRGH Chemicals for purification of
water
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 936
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2013
ICS 71.100.80 Supersedes EN 936:2006
English Version
Chemicals used for treatment of water intended for human
consumption - Carbon dioxide
Produits chimiques utilisés pour le traitement de l'eau Produkte zur Aufbereitung von Wasser für den
destinée à la consommation humaine - Dioxyde de carbone menschlichen Gebrauch - Kohlenstoffdioxid
This European Standard was approved by CEN on 26 October 2013.

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

CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2013 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 936:2013: E
worldwide for CEN national Members.

Contents Page
Foreword . 4
Introduction . 5
1 Scope . 6
2 Description . 6
2.1 Identification . 6
2.1.1 Chemical name . 6
2.1.2 Synonym or common name . 6
2.1.3 Relative molecular mass . 6
2.1.4 Empirical formula. 6
2.1.5 Chemical formula . 6
2.1.6 CAS Registry Number . 6
2.1.7 EINECS reference . 6
2.2 Commercial form . 6
2.3 Physical properties . 7
2.3.1 Appearance . 7
2.3.2 Density . 7
2.3.3 Solubility in water . 7
2.3.4 Vapour pressure . 7
2.3.5 Boiling point at 100 kPa . 7
2.3.6 Melting point . 7
2.3.7 Specific heat . 7
2.3.8 Viscosity (dynamic) . 7
2.3.9 Critical temperature . 7
2.3.10 Critical pressure. 7
2.3.11 Physical hardness . 7
2.4 Chemical properties . 8
3 Purity criteria . 8
3.1 General . 8
3.2 Composition of commercial product . 8
3.3 By-products . 8
3.4 Chemicals parameters . 9
4 Test methods . 9
4.1 Sampling . 9
4.2 Analysis . 10
4.2.1 Carbon dioxide . 10
4.2.2 Impurities . 10
5 Labelling - Transportation - Storage . 10
5.1 Means of delivery . 10
)
5.2 Labelling according to the EU legislation . 11
5.3 Transportation regulations and labelling . 12
5.4 Marking . 12
5.5 Storage . 12
Annex A (informative) General information on carbon dioxide . 13
A.1 Origin . 13
A.2 Use . 13
A.3 General rules relating to safety . 14
Bibliography . 15

Foreword
This document (EN 936:2013) 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 June 2014, and conflicting national standards shall be withdrawn at
the latest by June 2014.
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 936:2006.
Significant technical differences between this edition and EN 936:2006 are as follows:
a) the transportation regulations and labelling have been updated;
b) the requirement for carbon dioxide content is now 99,9 % instead of 99,0 % in the latest edition;
c) possible impurities are taken into account;
d) reference to sampling is changed;
e) revision of clause for raw materials;
f) revision of rules for safe handling and use of the product.
According to the CEN-CENELEC Internal Regulations, the national standards organizations 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.
Introduction
In respect to the 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.
1 Scope
This European Standard is applicable to carbon dioxide used for treatment of water inten
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