BS/EN 936-2013 pdf download.Chemicals used for treatment of water intended for human consumption – Carbon dioxide.
This BS/EN 936 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.
2 Description
2.1 Identification
2.1.1 Chemical name
Carbon dioxide.
2.1.2 Synonym or common name
Carbonic acid gas (carbonic anhydride).
2.1.3 Relative molecular mass
44,011.
2.1.4 EmpirIcal formula
Co2.
2.1.5 Chemical formula
Co2.
2.1.6 CAS Registry Number1)
124-38-9.
2.1.7 EINECS reference2)
204-696-9.
2.2 Commercial form
The carbon dioxide is supplied as a pressurised liquefied or refrigerated pressurised gas.
2.3 PhysIcal properties
2.3.1 Appearance
The carbon dioxide is a colourless gas or liquid.
2.3.2 Density
The density of the gas at 0 ‘C and 101,3 kPa 3) is 1,9768 kg/rn3, while the density of the liquid at 0 ‘C and 4 000 kPa is 933,318 kg/rn3.
2.3.3 Solubility in water
The solubility of the gas in water is 1.72 g/l at 20 ec and 101.3 kPa.
2.3.4 Vapour pressure
The vapour pressure of the liquid is 5 733,0 kPa at 20 ‘C.
2.3.5 Boiling point at 100 kPa
See 2.3.6.
2.3.6 Melting point
The sublimation point of solid CO2 is —78,9 °C and 101,3 kPa.
2.3.7 Specific heat
The specific heat of carbon dioxide is 0,827 kJ/kg x K at 0 ‘C and 100 kPa.
2.3.8 ViscosIty (dynamic)
The viscosity of the liquid is 147 Pa x s at 20 ‘C.
2.3.9 Critical temperature
The critical temperature of the liquid is 31 ‘C.
2.3.10 Critical pressure
2.4 Chemical properties
The carbon dioxide CO2 forms a weak acid when dissolved in water. It reacts in aqueous solution with alkali hydroxides to form carbonates and bicarbonates
3 Purity criteria
3.1 General
This European Standard specifies the minimum purity requirements for carbon dioxide 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. the user and when necessary to relevant authorities, shall be notified.
Users of this product should check the national regulations in order to darify 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 the 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 the production process or raw materials lead to significant quantities of further impurities or by-products being present, this shall be notified to the user.
3.2 Composition of commercial product
The products shall conform to the requirements specified in Table 1,
NOTE The minimum requirements of the commercial product are defined In the EU Directive 20081841EC of August 27, 2008 (see (2j) and additional Changes RL 2010/67!EG from October 20th, 2010.
3.3 By-products
The product tested in liquid phase shall conform to the requirements specified in Table 2.
4.2 AnalysIs
4.2.1 Carbon dioxide
Measure of a fixed volume of product (V1). Absorption in potassium hydroxide solution (KOH) 30 % by a proper CO2 appliance with an accuracy of volume fraction from 0 % to 0,05 % (calibrated in 0,01 % steps).The residue volume (2) which is measured after absorption of CO2 is to subtract from (U1). The difference (V1 – V) = V3 is equivalent to the volume part of CO2 (Equipment: Orsat, Zahm, Hasselberg). The recommendations of International Society of Beverage Technologists (ISBT) ‘Carbon Dioxide Guidelines
and Analytical Procedure Bibliography November 2010” should be observed (see [4J).
Alternatively, the carbon dioxide may be determined by gas chromatography.
4.2.2 ImpurIties
Determine the volume of gas impurity (see 4.2.1).
Alternatively, the impurities content may be determined by gas chromatography.
5 Labelling – Transportation – Storage
5.1 Means of delivery
Carbon dioxide shall be delivered liquefied, in pressurised containers (vessels) or as cryogenic liquefied gas in tanks.
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.BS/EN 936-2013 pdf download.
BS/EN 936-2013 pdf download
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