EN 939:2009

SLOVENSKI STANDARD
01-maj-2009
1DGRPHãþD
SIST EN 939:2000
Kemikalije, ki se uporabljajo za pripravo pitne vode - Klorovodikova kislina
Chemicals used for treatment of water intended for human consumption - Hydrochloric
acid
Produkte zur Aufbereitung von Wasser für den menschlichen Gebrauch - Salzsäure
Produits chimiques utilisés pour le traitement de l'eau destinée à la consommation
humaine - Acide chlorhydrique
Ta slovenski standard je istoveten z: EN 939:2009
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 939
NORME EUROPÉENNE
EUROPÄISCHE NORM
January 2009
ICS 71.100.80 Supersedes EN 939:1999
English Version
Chemicals used for treatment of water intended for human
consumption - Hydrochloric acid
Produits chimiques utilisés pour le traitement de l'eau Produkte zur Aufbereitung von Wasser für den
destinée à la consommation humaine - Acide chlorhydrique menschlichen Gebrauch - Salzsäure
This European Standard was approved by CEN on 5 December 2008.
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 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 Management Centre has the same status as the
official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, 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: rue de Stassart, 36  B-1050 Brussels
© 2009 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 939:2009: E
worldwide for CEN national Members.

Contents Page
Foreword .3
Introduction .4
1 Scope .5
2 Normative references .5
3 Description .5
3.1 Identification .5
3.2 Commercial forms .6
3.3 Physical properties .6
3.4 Chemical properties .7
4 Purity criteria .8
4.1 General .8
4.2 Composition of commercial product .8
4.3 Impurities and main by-products .8
4.4 Chemical parameters .9
5 Test methods .9
5.1 Sampling .9
5.2 Analysis .9
6 Labelling – Transportation – Storage . 16
6.1 Means of delivery . 16
6.2 Risk and safety labelling according to the UE Directives . 16
6.3 Transportation regulations and labelling . 17
6.4 Marking . 17
6.5 Storage . 18
Annex A (informative) General information on hydrochloric acid . 19
A.1 Origin . 19
A.2 Use . 19
A.3 Routine analyses . 20
Annex B (normative) General rules relating to safety . 21
B.1 Rules for safe handling and use . 21
B.2 Emergency procedures . 21
Annex C (normative) Determination of arsenic, antimony and selenium (atomic absorption
spectrometry hydride technique) . 22
C.1 General principle. 22
C.2 Interferences . 22
C.3 Reagents . 22
C.4 Apparatus . 24
C.5 Procedure . 26
C.6 Calculation . 27
Bibliography . 28

Foreword
This document (EN 939:2009) 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 July 2009, and conflicting national standards shall be withdrawn at the
latest by July 2009.
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 939:1999.
The significant technical differences between this edition and EN 939:1999 are as follows:
a) deletion of the reference to EU Directive 80/778/EEC of July, 15 1980 in order to take into account the
latest Directive in force (see [1]);
b) replacement of ISO 5666-1 by EN 1483.
Annex A is informative.
Annexes B and C are normative.
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, 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.

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.
1 Scope
This European Standard is applicable to hydrochloric acid used for treatment of water intended for human
consumption. It describes the characteristics of hydrochloric acid and specifies the requirements and the
corresponding test methods for hydrochloric acid. It gives information on its use in water treatment. It also
determines the rules relating to safe handling and use of hydrochloric acid (see Annex B).
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 1483, Water quality - Determination of mercury - Method using atomic absorption spectrometry
EN ISO 3696, Water for analytical laboratory use — Specification and test methods (ISO 3696:1987)
ISO 904, Hydrochloric acid for industrial use — Determination of total acidity — Titrimetric method
ISO 3165, Sampling of chemical products for industrial use — Safety in sampling
ISO 6206, Chemical products for industrial use — Sampling — Vocabulary
ISO 6685, Chemical products for industrial use — General method for determination of iron content — 1,10-
Phenanthroline spectorphotometric method
ISO 8288:1986, Water quality — Determination of cobalt, nickel, copper, zinc, cadmium and lead — Flame
atomic absorption spectrometric methods
ISO 9174, Water quality — Determination of chromium — Atomic absorption spectrometric methods

3 Description
3.1 Identification
3.1.1 Chemical name
Hydrochloric acid.
3.1.2 Synonym or common names
Muriatic acid, hydrogen chloride.
3.1.3 Relative molecular mass
36,46.
3.1.4 Empirical formula
HCl
3.1.5 Chemical formula
HCl
1)
3.1.6 CAS Registry Number
7647-01-0.
2)
3.1.7 EINECS reference
231-595-7.
3.2 Commercial forms
The product is supplied as aqueous solutions of hydrochloric acid with mass fraction of 25 % to 38 %
(concentrated acid).
Dilutions of these solutions are also available.
3.3 Physical properties
3.3.1 Appearance
The solution is colourless to yellow and slightly fuming to strongly fuming, depending on concentration.
3.3.2 Density
The density is between 1,135 g/ml and 1,185 g/ml at 20 °C, depending on concentration.
3.3.3 Solubility
The product is miscible with water in any proportion.
3.3.4 Vapour pressure
The vapour pressure for HCl at mass fraction 30 % depending on temperature is given in Table 1.
Table 1 — Vapour pressure of hydrochloric acid solutions
Temperature p p p
total HCl H O
°C kPa kPa kPa
20 2,13 1,41 0,72
50 13,73 9,46 4,27
1 )
Chemical Abstracts Service Registry Number
2 )
European Inventory of Existing Commercial Chemical Substances
3.3.5 Boiling point at 100 kPa
The boiling point of HCl depending on concentration is given in Table 2.
Table 2 — Boiling point of hydrochloric acid solutions
a
Concentration Boiling point at 100 kPa
Mass fraction in % °C
25 104
30 90
38 50,5
a
100 kPa = 1 bar
3.3.6 Melting or freezing point
The melting or freezing point of HCl depending on concentration is given in Table 3.
Table 3 — Melting or freezing point
Concentration Melting or freezing point
Mass fraction in % °C
38 - 27
25 - 75
3.3.7 Specific heat
.
3,14 kJ/(kg K) at 18 °C for HCl at mass fraction 16,83 %.
3.3.8 Viscosity (dynamic)
The viscosity of a HCl at mass fraction 30 %, solution at 15 °C, is 1,9 mPa.s.
3.3.9 Critical tem
...