SIST EN 900:2014

SLOVENSKI STANDARD
01-oktober-2014
1DGRPHãþD
SIST EN 900:2008
Kemikalije, ki se uporabljajo za pripravo pitne vode - Kalcijev hipoklorit
Chemicals used for treatment of water intended for human consumption - Calcium
hypochlorite
Produkte zur Aufbereitung von Wasser für den menschlichen Gebrauch -
Calciumhypochlorit
Produits chimiques utilisés pour le traitement de l'eau destinée à la consommation
humaine - Hypochlorite de calcium
Ta slovenski standard je istoveten z: EN 900:2014
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 900
NORME EUROPÉENNE
EUROPÄISCHE NORM
July 2014
ICS 71.100.80 Supersedes EN 900:2007
English Version
Chemicals used for treatment of water intended for human
consumption - Calcium hypochlorite
Produits chimiques utilisés pour le traitement de l'eau Produkte zur Aufbereitung von Wasser für den
destinée à la consommation humaine - Hypochlorite de menschlichen Gebrauch - Calciumhypochlorit
calcium
This European Standard was approved by CEN on 22 May 2014.

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
© 2014 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 900:2014 E
worldwide for CEN national Members.

Contents Page
Foreword .4
Introduction .5
1 Scope .6
2 Normative references .6
3 Description .6
3.1 Identification .6
3.1.1 Chemical name .6
3.1.2 Synonym or common name .6
3.1.3 Relative molecular mass .6
3.1.4 Empirical formula.6
3.1.5 Chemical formula .7
)
3.1.6 CAS Registry Number .7
)
3.1.7 EINECS reference .7
3.2 Commercial form .7
3.3 Physical properties .7
3.3.1 Appearance .7
3.3.2 Density .7
3.3.3 Solubility in water .7
3.3.4 Vapour pressure .7
)
3.3.5 Boiling point at 100 kPa .7
3.3.6 Melting point .7
3.3.7 Specific heat .7
3.3.8 Viscosity, dynamic.8
3.3.9 Critical temperature .8
3.3.10 Critical pressure.8
3.3.11 Physical hardness .8
3.4 Chemical properties .8
4 Purity criteria .8
4.1 General .8
4.2 Composition of commercial product .8
4.3 Impurities and main by-products .9
4.4 Chemical parameters .9
5 Test methods .9
5.1 Sampling .9
5.2 Analysis . 10
5.2.1 Determination of calcium hypochlorite content (main product) . 10
5.2.2 Dissolution quality (available chlorine after 1 min) . 12
5.2.3 Impurities . 13
5.2.4 Chemical parameters . 14
6 Labelling - Transportation - Storage . 16
6.1 Means of delivery . 16
)
6.2 Labelling according to the EU legislation . 17
6.3 Transportation regulations and labelling . 17
6.4 Marking . 18
6.5 Storage . 18
6.5.1 General . 18
6.5.2 Long term stability . 18
6.5.3 Storage incompatibilities . 19
Annex A (informative)  General information on calcium hypochlorite . 20
A.1 Origin . 20
A.1.1 Raw materials . 20
A.1.2 Manufacturing process . 20
A.2 Use . 20
A.2.1 Function. 20
A.2.2 Form in which it is used . 20
A.2.3 Treatment dose . 20
A.2.4 Means of application . 20
A.2.5 Secondary effects . 20
A.2.6 Removal of excess product . 21
Annex B (normative)  General rules relating to safety . 22
B.1 Rules for safe handling and use . 22
B.2 Emergency procedures . 22
B.2.1 First aid . 22
B.2.2 Spillage . 22
B.2.3 Fire . 22
Annex C (normative) Determination of arsenic, antimony and selenium (atomic absorption

spectrometry hydride technique) . 23
C.1 General principle . 23
C.2 Interferences . 23
C.3 Reagents. 23
C.4 Apparatus . 25
C.4.1 General . 25
C.5 Procedure . 27
C.5.1 Preparation of the apparatus . 27
C.5.2 Preparation of calibration solutions . 27
C.5.3 Preparation of test solutions and standard solutions . 27
C.5.4 Determination of arsenic with sodium borohydride . 27
C.5.5 Determination of selenium with sodium borohydride . 28
C.5.6 Determination of antimony with sodium borohydride . 28
C.6 Calculation . 28
C.7 Repeatability limit . 28
Annex D (informative) Environmental, health and safety precautions within chemical laboratory . 29
Bibliography . 30

Foreword
This document (EN 900:2014) 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 January 2015, and conflicting national standards shall be withdrawn at
the latest by January 2015.
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 900:2007.
Significant technical differences between this edition and EN 900:2007 are as follows:
a) deletion of the maximum sodium chloride content and of its relevant method of determination;
b) replacement of warning and safety precautions notes by labelling according to REGULATION (EC)
No 1272/2008.
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
With respect to 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 1 Conformity with this European Standard does not confer or imply acceptance or approval of the products in
any of the Member States of the EU or EFTA. The use of the products covered by this European Standard is subject to
regulation or control by National Authorities.
NOTE 2 This product is a biocide and needs to comply with the relevant legislation in force. In the European Union, at
the time of publication, this legislation is Directive 98/8/EC [1]).
1 Scope
This European Standard is applicable to calcium hypochlorite used for the treatment of water intended for
human consumption. It describes the characteristics of calcium hypochlorite and specifies the requirements
and the corresponding test methods for calcium hypochlorite. It provides information on its use in water
treatment. It also determines the rules relating to safe handling and use of calcium hypochlorite (see
Annex B).
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 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
ISO 8288, 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
Calcium hypochlorite.
3.1.2 Synonym or common name
None.
3.1.3 Relative molecular mass
142,99.
3.1.4 Empirical formula
Ca(ClO) .
3.1.5 Chemical formula
Ca(ClO) .
1)
3.1.6 CAS Registry Number
7778-54-3.
2)
3.1.7 EINECS reference
231-908-7.
3.2 Commercial form
The product is available as a granular solid or in the form of tablets.
3.3 Physical properties
3.3.1 Appearance
The product is white free-flowing granules or white tablets.
3.3.2 Density
3 3 3 3
The bulk density is approximately 0,8 g/cm to 1 g/cm for loose granular material and 1,2 g/cm to 1,3 g/cm
3 3
for tablets, while the density of one tablet is approximately 1,7 g/cm to 1,9 g/cm .
3.3.3 Solubility in water
The solubility is 180 g/l at 25 °C.
3.3.4 Vapour pressure
Not applicable.
3)
3.3.5 Boiling point at 100 kPa
Not applicable.
3.3.6 Melting point
Not applicable as the product decomposes at 177 °C.
3.3.7 Specific heat
Not known.
1)
Chemical Abstracts Service Registry Number.
2)
European Inventory of Existing Commercial Chemical Substances.
3)
100 kPa = 1 bar.
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
Not applicable.
3.4 Chemical properties
Solutions of calcium hypochlorite are alkaline. The pH value of a solution of concentration 10 g/l is about 11,5
at 25 °C.
Calcium hypochlorite is a strong oxidant and chlorination agent. It reacts with acids or acidic salts to form
chlorine, and can form explosive nitrogen chlorides with ammonia and ammonia compounds. In the presence
of inflammable substances, it causes fires and explosions of organic compounds, oxidation reactions occur
with the release of heat and of moisture, and it is also highly corrosive to most metals.
4 Purity criteria
4.1 General
This European Standard specifies the minimum purity requirements for calcium hypochlorite 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, then the user, and when necessary the relevant authorities, shall be notified.
Users of the product should check the national regulations 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 product 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 in the production process or
raw materials lead 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 a minimum of a mass fraction of 65,5 % of calcium hypochlorite (equivalent to an
available active chlorine content of at least a mass fraction of 65 %).
Dissolution quality, calculated as available chlorine which is obtainable within 1 min after dissolution in water,
shall not be less than a mass fraction of 45,5 %.
The water content at the time of delivery should not exceed a mass fraction of 16 % of the product. As the test
method is usually not conducted by the user without danger of explosion, the manufacturer should guarantee
to maintain this value. If necessary a test laboratory may be requested to carry out this test. This
determination should be carried out by specialists only.
4.3 Impurities and main by-products
The content of water-insoluble matter shall not exceed a mass fraction of 6 % of the product.
NOTE 1 The water insoluble matter consists mainly of carbonates.
NOTE 2 Calcium chlorate can be present as a by-product of the production process.
4.4 Chemical parameters
The product shall conform to the requirements specified in Table 1.
Table 1 — Chemical parameters
Limit in mg/kg of available
Parameter
chlorine
Type 1 Type 2
Arsenic (As) max. 5 10
Cadmium (Cd) max. 5 10
Chromium (Cr) max. 15 15
Mercury (Hg) max. 5 7
Nickel (Ni) max. 8 10
Lead (Pb) max. 15 15
Antimony (Sb) max. 15 15
Selenium (Se) max. 20 20
Limit in g/kg of available
chlorine
a
Bromate max. 2,1 4,2
NOTE Cyanide, which does not exist in a strong oxidizing medium
such as calcium hypochlorite is not a relevant chemical parameter.
Pesticides and polycyclic aromatic hydrocarbons are not by-products of
the manufacturing process. For parametric values of calcium hypochlorite
on trace metal content in drinking water, see [2].
a
Bromate is a by-product of the manufacturing process.
5 Test methods
5.1 Sampling
Observe the general recommendations of ISO 3165 and take account of ISO 6206. Prepare the laboratory
sample(s) required by the relevant procedure described in ISO 8213.
5.2 Analysis
5.2.1 Determination of calcium hypochlorite content (main product)
5.2.1.1 Principle
Calcium hypochlorite reacts with potassium iodide to release iodine in the presence of acetic acid. The iodine
is titrated with sodium thiosulfate standard volumetric solution in the presence of starch indicator solution.
NOTE 1 It detects all oxidizing agents being active in a weak acidic solution, i.e. hypochlorite/chlorine, iodate, and
partially chloramines, Fe(III), etc. Not covered under these conditions are bromate and chlorate.
NOTE 2 The titration may also be carried out potentiometrically, with automatic titration, in which case the addition of
soluble starch is unnecessary.
5.2.1.2 Reagents
All reagents shall be of a recognized analytical grade and the water used shall conform to grade 3 as specified
in EN ISO 3696.
5.2.1.2.1 Potassium iodide crystals (KI).
5.2.1.2.2 Glacial acetic acid.
5.2.1.2.3 Hydrochloric acid solution.
Concentrated hydrochloric acid density ρ (HCl) = 1,16 g/ml diluted 1 + 1 by volume with water.
5.2.1.2.4 Sodium thiosulfate standard volumetric solution, c(Na S O .5H O) = 0,1 mol/l.
2 2 3 2
Standard volumetric solutions are commercially available, which might have to be diluted.
Alternatively a standard volumetric solution may be prepared by the following procedure: Dissolve 24,8 g
Na S O .5H O in a 1 000 ml one-mark volumetric flask in about 0,75 l water. After the temperature has
2 2 3 2
equalized make up to the mark with water and mix thoroughly.
To standardize: Weigh, to the nearest 0,1 mg, 3,600 g (m) of dry potassium iodate. Dissolve in water in
a 1 000 ml one-mark volumetric flask, make up to the mark with water and mix (standard reference solution
c(1/6 KIO ) = 0,1 mol/l). Place 200 ml of water in a 500 ml stoppered conical flask, add (2 ± 0,5) g of
potassium iodide and stir to dissolve. Then introduce by means of a pipette, 10,0 ml of sodium thiosulfate
solution for standardization, add (15 ± 1) ml of hydrochloric acid solution (5.2.1.2.3) and (5 ± 1) ml of starch
solution (5.2.1.2.5). Titrate immediately with the potassium iodate standard reference solution until the
appearance of a blue coloration persisting for at least 30 s. Record the volume (V) of iodate used.
The concentration, c, of the sodium thiosulfate standard volumetric solution (Na S O .5H O), expressed in
2 2 3 2
moles per litre is given by the following formula:
m
C= (1)
V×49,0317
where
m is the mass, in milligrams, of potassium iodate (KIO ) weighed;
V
is the volume, in millilitres, of the sodium thiosulfate standard volumetric solution used.
5.2.1.2.5 Starch solution, mass fraction 1 %.
Make a slurry with (1 ± 0,1) g starch and (5 ± 1) ml water. Add (90 ± 5) ml boiling water to the slurry. Stir to
dissolve it and cool the solution. This solution needs refrigeration to avoid the decomposition of the starch
which results in a vague end point. Keep the solution cool and use it within one week.
Commercial indicators for iodine titration exist and may be used in place of the described starch solution
provided that their efficiency has been previously tested.
5.2.1.3 Apparatus
Ordinary laboratory apparatus and glassware, together with the following:
5.2.1.3.1 Laboratory sonic vibrator.
5.2.1.4 Procedure
5.2.1.4.1 Test portion
Weigh, to the nearest 0,1 mg, 3,5 g of the laboratory sample (m ) into a tarred stoppered weighing bottle.
5.2.1.4.2 Determination
Transfer the test portion to a 500 ml volumetric flask with 300 ml of water, stopper, and place in the sonic
vibrator for 10 min, swirling it occasionally until the test portion is in a solution. Make up to the mark with
water.
Place a magnetic stirring bar into the volumetric flask and begin mixing. Transfer 25 ml, while the test portion
is being stirred and without allowing any insoluble matter to settle out, into the 500 ml conical flask.
Add 100 ml of water and 2 g of potassium iodide (5.2.1.2.1), and mix to dissolve. Add 8 ml of glacial acetic
acid (5.2.1.2.2), stir and titrate immediately with the sodium thiosulfate standard volumetric solution (5.2.1.2.4)
to a light yellow colour. Add 3 ml of the starch solution (5.2.1.2.5) and continue titration to the disappearance
, of the sodium thiosulfate standard volumetric solution used.
of the blue black colour. Record the volume V
5.2.1.5 Expression of results
The chlorine (Cl ) content, w , expressed as a mass fraction in %, is given by the following formula:
2 1
V× c× 35,453× 20× 100
w = (2)
m
where
V is the volume, in millilitres, of the sodium thiosulfate solution (5.2.1.2.4) used for the
titration;
c is the concentration, in moles per litre, of the sodium thiosulfate standard volumetric
solution (5.2.1.2.4);
m is the mass, in milligrams, of the test portion (5.2.1.4.1);
35,453 is the mass in milligrams of chlorine (Cl ) corresponding to 1,00 ml of sodium thiosulfate
solution c(Na S O .5H O) = 1,000 mol/l.
2 2 3 2
The Ca(ClO) content, w , expressed as a mass fraction of product, is given by the following formula:
2 2
w × 3,574 6
w = (3)
3,5453
5.2.1.6 Repeatability limit
The absolute difference between two single test results, obtained under repeatability conditions, shall not be
greater than the repeatability value, r, as calculated from the following formula:
r = 0,01 × z (4)
where
z is the mean of the two results, expressed in mass fraction in percent (%).
NOTE Repeatability conditions are conditions where mutually independent test results are obtained with the same
method on identical test material in the same laboratory by the same operator using the same equipment within short
intervals of time.
5.2.2 Dissolution quality (available chlorine after 1 min)
5.2.2.1 Principle
A representative sample is stirred in water for 1 min and immediately titrated iodometrically. Dissolved calcium
hypochlorite reacts with iodide in the presence of acetic acidic to release iodine, which is titrated with sodium
thiosulfate standard volumetric solution.
NOTE The titration may be carried out manually with the addition of starch solution as a visual indicator, or
potentiometrically with automatic titration and without an indicator.
5.2.2.2 Reagents
All reagents shall be of a recognized analytical grade and the water used shall conform to grade 3 as specified
in EN ISO 3696.
5.2.2.2.1 Sodium thiosulfate standard volumetric solution, c(Na S O .5H O) = 0,1 mol/l (see 5.2.1.2.4).
2 2 3 2
5.2.2.2.2 Potassium iodide, virtually free of iodate.
5.2.2.2.3 Glacial acetic acid.
5.2.2.2.4 Starch indicator solution, mass fraction 1 % (see 5.2.1.2.5).
5.2.2.3 Apparatus
Ordinary laboratory apparatus and glassware.
5.2.2.4 Procedure
From a representative sample of the product weigh 1,5 g to the nearest 1 mg (m ). Add the test portion to a
beaker containing 1 000 ml of water (at a temperature of 20 °C to 25 °C) and by use of a magnetic stirrer
agitate the contents.
After 1 min stop the stirrer and remove a 25 ml aliquot by use of a pipette. Transfer to a conical flask
containing 100 ml of water, add 2 g of potassium iodide crystals (5.2.2.2.2), 8 ml of acetic acid (5.2.2.2.3) and
titrate the liberated iodine with sodium thiosulfate standard volumetric solution (5.2.2.2.1) to a light yellow
colour. Add 3 ml of the starch indicator solution (5.2.2.2.4) and continue titration to the disappearance of the
blue-black colour. Record the volume (V ) of the sodium thiosulfate standard volumetric solution used.
5.2.2.5 Expression of results
The available chlorine which is released within 1 min, (w ), expressed as a mass fraction in % of product is
given by the following formula:
Vc×× 35,453× 40×100
w = (5)
m
where
c is the concentration in moles per litre of sodium thiosulfate standard volumetric
solution (5.2.2.2.1);
V is the volume, in millilitres, of the sodium thiosulfate standard volumetric solution
(5.2.2.2.1);
m is the mass, in milligrams, of the test portion;
35,453 is the mass in milligrams of chlorine (Cl ) corresponding to 1,00 ml of sodium thiosulfate
standard volumetric solution c(Na S O .5H O) = 1,000 mol/l.
2 2 3 2
5.2.2.6 Repeatability limit
The absolute difference between two single test results, obtained under repeatability conditions, shall not be
greater than the repeatability value, r, as calculated from the following formula:
r = 0,01 z (6)
where
z is the mean of the two results, expressed in mass fraction in percent (%).
NOTE Repeatability conditions are conditions where mutually independent test results are obtained with the same
method on identical test material in the same laboratory by the same operator using the same equipment within short
intervals of time.
5.2.3 Impurities
5.2.3.1 Insoluble matter
5.2.3.1.1 Principle
A representative sample of calcium hypochlorite is dissolved into water. The insoluble matter is separated by
filtration then dried and weighed.
5.2.3.1.2 Apparatus
Ordinary laboratory apparatus and glassware together with the following:
5.2.3.1.2.1 Sintered glass crucible of porosity P40 (pores size between 16 μm to 40 μm).
5.2.3.1.2.2 Oven capable of being controlled at (105 ± 3) °C.
5.2.3.1.3 Procedure
) to the nearest 0,01 g and dissolve in 1 000 ml of
Weigh approximately 10 g of the representative sample (m
water by stirring for 30 min. Then filter the solution under vacuum through a dried and weighed glass filter
(5.2.3.1.2.1). After the filtration, wash the residue with 20 ml of water and remove excess water by filtering
under vacuum. Dry the residue at (105 ± 3) °C in the oven (5.2.3.1.2.2) until the mass remains constant and
weigh it (m ) after cooling in a desiccator.
5.2.3.1.4 Expression of results
The insoluble matter expressed as a mass fraction in %, w in the product is given by the following formula:
m
w = × 100 (7)
m
where
m is the mass, in grams, of the residue;
m
is the mass, in grams, of the test portion.
5.2.3.2 Water content
WARNING If the product is overheated (see 6.5.2), a violent decomposition or explosion can occur.
This test shall only be carried out by experienced laboratory staff (usually by the manufacturing
company) and not by the end users.
The determination of the water content of calcium hypochlorite may be achieved by drying a sample at
temperature between 105 °C and 110 °C until the mass of dried residue remains constant.
5.2.4 Chemical parameters
5.2.4.1 General
Determination of antimony (Sb), arsenic (As), cadmium (Cd), chromium (Cr), lead (Pb), nickel (Ni) and
selenium (Se).
5.2.4.2 Principle
The elements arsenic, antimony, cadmium, chromium, lead, nickel and selenium are determined by atomic
absorption spectrometry.
5.2.4.3 Reagents
All reagents shall be of a recognized analytical grade and the water used shall conform to the grade 2
specified in EN ISO 3696.
5.2.4.3.1 Nitric acid, concentrated, density ρ = 1,42 g/ml.
5.2.4.4 Procedure
5.2.4.4.1 Test portion
Weigh, to the nearest 0,001 g, 10 g (m ) of the laboratory sample into a 100 ml one-mark volumetric flask.
5.2.4.4.2 Test solution
Add 1 ml of nitric acid (5.2.4.3.1) to the test portion; dilute with a few millilitres of water and mix. Make up to
volume with water and homogenize.
5.2.4.4.3 Determination
Determine the content of elements in the test solution (5.2.4.4.2) in accordance with the following methods:
— Cd, Ni and Pb: In accordance with ISO 8288, Method A;
— Cr: In accordance with ISO 9174;
— As, Se and Sb: In accordance with the method given in Annex C.
These methods will give an interim result (y) expressed in milligrams per litre which needs to be converted to
give the final concentration according to the formula in 5.2.4.4.4.
5.2.4.4.4 Expression of results
From the interim result (y) determined (see 5.2.4.4.3), the content, w , of each element in the laboratory
sample, expressed in milligrams per kilogram of available chlorine is given by the following formula:
V 100
w = y× × (8)
m w
where
y is the interim result (5.2.4.4.3);
V
is the volume, expressed in millilitres, of the test solutions (5.2.4.4.2) (= 100 ml);
m is the mass, expressed in grams, of the test portion (5.2.4.4.1);
w is the available chlorine content in mass fraction of product (5.2.1.5).
5.2.4.5 Determination of the mercury content (Hg)
5.2.4.5.1 Principle
The element mercury is determined by flameless atomic absorption spectrometry in accordance
with EN ISO 12846:2012, Clause 7.
5.2.4.5.2 Reagents
All reagents shall be of a recognized analytical grade and the water used shall conform to the grade 3
specified in EN ISO 3696.
5.2.4.5.2.1 Potassium permanganate solution, c(KMnO ) = 50 g/l.
5.2.4.5.2.2 Sulfuric acid, concentrated, density ρ = 1,84 g/ml.
5.2.4.5.2.3 Hydroxylammonium chloride solution, c(NH OH.HCl) = 100 g/l.
5.2.4.5.2.4 Potassium dichromate solution, c(K Cr O ) = 4 g/l in 50 % (V/V) nitric acid solution.
2 2 7
5.2.4.5.3 Procedure
5.2.4.5.3.1 Test portion
Weigh, to the nearest 0,01 g, 10 g (m ) of the laboratory sample, into a glass beaker.
5.2.4.5.3.2 Test solution
Quantitatively transfer the test portion to a washing flask (e.g. Durand bottle), capacity 250 ml, the gas inlet of
which is made of a porous frit. Dilute the contents of the washing flask with water to obtain a total volume of
100 ml. Transfer to a volumetric flask (solution A).
Accurately pipette 10 ml of the solution A. Transfer to a 250 ml conical flask and add 60 ml of water, 20 ml of a
potassium permanganate solution (5.2.4.5.2.1) and five 1 ml portions of sulfuric acid (5.2.4.5.2.2). Heat and
keep boiling for 10 min. Allow to cool. Dissolve the precipitate (MnO ) with hydroxylammonium chloride
(5.2.4.5.2.3), add 5 ml of the potassium dichromate solution (5.2.4.5.2.4) and transfer to a 100 ml volumetric
flask. Make up to the mark with water and mix.
5.2.4.5.3.3 Determination
Proceed as described in EN ISO 12846:2012, Clause 7.
5.2.4.5.4 Expression of result
The interim result for mercury content (y) expressed in milligrams is given by the following formula:
V
T
y= y × (9)
A
where
y is the result obtained, for the concentration of mercury in solution A, expressed in milligrams
A
per litre;
V is the volume in millilitres of the test solution.
T
The content of mercury, C , in milligrams per kilogram of available chlorine is given by the following formula:
10 100
C = y× × (10)
m w
where
m
is the mass, expressed in grams, of the test portion;
w is the available chlorine content in mass fraction (5.2.1.5).
6 Labelling - Transportation - Storage
6.1 Means of delivery
Calcium hypochlorite shall be delivered in plastic-coated steel drums, plastic pails or polyethylene bottles.
In order that the purity of the product is not affected, the means of delivery shall not have been previously
used for any different product or it shall have been specially cleaned and prepared before use.
4)
6.2 Labelling according to the EU legislation
The following labelling requirements shall apply to calcium hypochlorite at the date of the publication of this
European Standard.
— Signal word:
Danger
— Hazard statements:
H272 May intensify fire; oxidiser

H 314 Causes severe skin burns and eye damage

H 302 Harmful if swallowed
H400 Very toxic to aquatic life

The regulation [3] contains a list of substances classified by the EU. Substances not listed in this regulation
should be classified on the basis of their intrinsic properties according to the criteria in the regulation by the
person responsible for the marketing of the substance.
6.3 Transportation regulations and labelling
Calcium hypochlorite is listed as:
5)
— UN Number 1748 for granular, calcium hypochlorite mixture, dry;
— UN Number 1748 for tablets, calcium hypochlorite mixture, dry;
NOTE The above products have more than a mass fraction of 39 % available chlorine.
5)
— UN Number 2880 for granular, calcium hypochlorite, hydrated or calcium hypochlorite, hydrated
mixture;
— UN Number 2880 for tablets, calcium hypochlorite, hydrated or calcium hypochlorite, hydrated mixture;
NOTE The above products contain a minimum of mass fraction 5,5 % of water but no more than 16 % of water.
5)
— UN Number 3485 for granular, calcium hypochlorite mixture, dry;

4)
See [3].
5)
United Nations Number.
— UN Number 3485 for tablets, calcium hypochlorite mixture, dry;
NOTE The above products have more than a mass fraction of 39 % available chlorine.
5)
— UN Number 3487 for granular, calcium hypochlorite, hydrated or calcium hypochlorite, hydrated
mixture;
— UN Number 3487 for tablets, calcium hypochlorite, hydrated or calcium hypochlorite, hydrated mixture;
NOTE The above products contain a minimum of mass fraction 5,5 % of water but no more than 16 % of water.
6)
— RID : class 5.1, classification code O2, packing group II (III for tablets);
7)
— ADR : class 5.1, classification code O2, packing group II (III for tablets);
8)
— IMDG : class 5.1;
9)
— IATA : class 5.1.
6.4 Marking
The marking shall include the following:
— name “calcium hypochlorite”, trade name, grade and type;
— net mass;
— name and the address of supplier and/or manufacturer;
— statement “this product conforms to EN 900”.
6.5 Storage
6.5.1 General
The product shall be stored in airtight containers in a cool, dry and well-ventilated room.
6.5.2 Long term stability
Heat stability: The stability of solid calcium hypochlorite depends on the water content.
At temperatures above 177 °C, decomposition is rapid with the evolution of oxygen and heat and thus
increasing the risks of pressure build-up to blow off the lid or rupture the container.
Decomposition also occurs at temperatures maintained above about 50 °C for longer periods.
NOTE Decomposition products are calcium chloride (CaCl ), oxygen (O ) and chlorine (Cl ).
2 2 2
6)
Regulations concerning International carriage of Dangerous goods by rail.
7)
European Agreement concerning the international carriage of Dangerous goods by Road.
8)
International Maritime transport of Dangerous Goods.
9)
International Air Transport Association.
Chemical stability:
Contamination can initiate a vigorous chemical reaction resulting in fire and/or explosion.
6.5.3 Storage incompatibilities
Keep away from acids, acidic salts, ammonia and ammoniu
...