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NS EN 973 : 2009
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The latest, up-to-date edition.
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CHEMICALS USED FOR TREATMENT OF WATER INTENDED FOR HUMAN CONSUMPTION - SODIUM CHLORIDE FOR REGENERATION OF ION EXCHANGERS
12-01-2013
Foreword
1 Scope
2 Normative references
3 Description
3.1 Identification
3.2 Commercial forms
3.3 Physical properties
3.4 Chemical properties
4 Purity criteria
4.1 Composition of commercial product
4.2 Impurities and main by-products
4.3 Chemical parameters
5 Test methods
5.1 Sampling
5.2 Analyses
6 Labelling - Transportation - Storage
6.1 Means of delivery
6.2 Risk and safety labelling in accordance with the EU
directives
6.3 Transportation regulations and labelling
6.4 Marking
6.5 Storage
Anenx A (informative) General information on sodium chloride
A.1 Origin
A.2 Use
A.3 Rules for safe handling and use
A.4 Emergency procedures
Annex B (normative) Analytical methods
B.1 Determination of antimony, arsenic, cadmium, chromium,
lead, nickel and selenium (inductively coupled plasma
optical emission spectrometry (ICP/OES))
B.2 Determination of total mercury (cold vapour atomic
absorption spectrometry)
B.3 Determination of water-soluble hexacyanoferrate (II)
(molecular absorption spectrometry)
B.4 Determination of potassium (Flame atomic absorption
spectrometric method)
Annex C (informative) Determination of cadmium, chromium,
nickel and lead (flame atomic absorption spectrometry)
C.1 Determination of cadmium
C.2 Determination of chromium
C.3 Determination of nickel
C.4 Determination of lead
Annex D (informative) Determination of arsenic, antimony
and selenium (atomic absorption spectrometry hydride
technique)
D.1 General principle
D.2 Interferences
D.3 Reagents
D.4 Apparatus
D.5 Procedure
D.6 Calculation
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