BS EN 937:2009 pdf free download – Chemicals used for treatment of water intended for human consumption Chlorine.
— T :Toxic
N : Dangerous for the environment
– nature of special risks:
R 23 : Toxic by inhalation;
— R 36/37/38: Irritating to eyes, respiratory system and skin;
– R 50 : Very toxic to aquatic organisms safety advice:
S 7/9: Keep container tightly closed and in a well-ventilated place;
S 45: In case of accident or if you feel unwell, seek medical advice immediately (show the label
where possible);
S 61: Avoid release to the environment – Refer to special instructions / Safety date sheet.
NOTE 1 Annex I of the Directive 67/548/EEC see [2] on classication, packaging and labelling of dangerous
substances and its amendments and adaptations in the European Union contains a list of substances classified by the EU.
Substances not in this Annex I should be classified on the basis of their intrinsic properties according to the criteria in the
Directive by the person responsible for the marketing of the substance. The labelling information given above covers the
30th ATP (adaptation to technical progress) of the EU Directive [2].”
NOTE 2 Chlorine used for treatment of water intended for human consumption is applied as a biocidal product. Therefore additional labelling requirements according to Directive 98/8/EC (see [3]) shall be applied.
6.3 Transportation regulations and labelling Chlorine is listed as UN Number )1017.
ADR 6/RlD ): class 2, classification code 2 TC, labels : 2.3 + 8+ environmentally hazardous substance mark, hazard n°. :268.
IMDG 8): class 2.3, marine pollutant: yes, EmS: F-C, S-U.
IATA Not permitted.
6.4 Marking
Each container shall be marked with at least the following informations:
the name: “chlorine”, the trade name, the grade and type:
A.1 Origin
A.1.1 Raw materials
Alkali chlorides (sodium chloride or potassium chloride) or hydrogen chloride, water.
A.1.2 Manufacturing process
Electrolysis of alkali chloride solutions or hydrochloric acid.
A.2 Use
A.2.1 Function
Disinfectant, removal of ammonia compounds, oxidizing of sulfides, oxidizing of iron(lI) to iron(lll).
A.2.2 Form in which the product is used
It is used as delivered. Chlorine is released off the pressurised containers either as gas or as liquid that is
vaporised externally by adequate vaporising equipment.
A.2.3 Treatment dose
The treatment dose depends on the composition of the raw water Care should be taken not to exceed a maximum concentration of active chlorine at the water tap, usually a few tenths of 1 mg/I.
A.2.4 Means of application
Gaseous chlorine is fed into the water stream by adequate injection devices (usually vacuum injection devices).
A.2.5 Secondary effects
Excess of dosage can lead to slight pH lowering due to generation of hydrochloric acid.
Oxidation of organic compounds: the formation of halogenated organic substances, especially
trihalomethanes, is possible.
A.2.6 Removal of excess product
The most practical method will be the use of sulfur dioxide or an aqueous solution of a sulfite compound. Other methods can utilise activated carbon or hydrogen peroxide.