【BS英國標(biāo)準(zhǔn)】BS EN 936-2006 Chemicals used for treatment of water intended for human consumption — Carbon dioxide.doc

british standardbs en 936:2006licensed copy: x x, the university of sheffield, 03/07/2009 16:44, uncontrolled copy, (c) bsichemicals used fortreatment of water intended for human consumption carbon dioxideics 13.060.20; 71.100.80no copying without bsi permission except as permitted by copyright lawbs en 936:2006national forewordthis british standard is the uk implementation of 936:2006. it supersedes bs en 936:1998 which is withdrawn.the uk participation in its preparation was entrusted to technicalcommittee cii/59, chemicals for drinking water treatment.a list of organizations represented on this committee can be obtained on request to its secretary.this publication does not purport to include all the necessary provisions of a contract. users are responsible for its correct application.compliance with a british standard cannot confer immunity from legal obligations.licensed copy: x x, the university of sheffield, 03/07/2009 16:44, uncontrolled copy, (c) bsithis british standard was published under the authority of the standards policy and strategy committee on 31 october2008 bsi 2008isbn 978 0 580 55268 7amendments/corrigenda issued since publicationdate commentsbs en 936:2006european standard norme europenneeuropische normen 936august 2006ics 71.100.80supersedes en 936:1997english versionchemicals used for treatment of water intended for human consumption - carbon dioxideproduits chimiques utiliss pour le traitement de leau destine la consommation humaine - dioxyde de carboneprodukte zur aufbereitung von wasser fr den menschlichen gebrauch - kohlenstoffdioxidthis european standard was approved by cen on 26 june 2006.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 central secretariat 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 central secretariat has the same status as the official versions.cen members are the national standards bodies of austria, belgium, 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 c o m i t eur o p en de nor m a l i s a ti on eur o p i s c h es kom i tee f r nor m ung management centre: rue de stassart, 36 b-1050 brusselslicensed copy: x x, the university of sheffield, 03/07/2009 16:44, uncontrolled copy, (c) bsi 2006 cenall rights of exploitation in any form and by any means reserved worldwide for cen national members.ref. no. en 936:2006: elicensed copy: x x, the university of sheffield, 03/07/2009 16:44, uncontrolled copy, (c) bsicontentspageforeword.3introduction .41scope .52description .52.1identification.52.2commercial form .52.3physical properties.62.4chemical properties .63purity criteria.73.1general.73.2composition of commercial product .73.3impurities and main by-products .73.4chemicals parameters .74test methods.74.1sampling .74.2analysis .75labelling - transportation - storage.85.1means of delivery.85.2risk and safety labelling according to the eu directives .85.3transportation regulations and labelling .85.4marking .95.5storage.9annex a (informative) general information on carbon dioxide.10a.1origin .10a.2use .12a.3general rules relating to safety .12bibliography .1413bs en 936:2006en 936:2006 (e)licensed copy: x x, the university of sheffield, 03/07/2009 16:44, uncontrolled copy, (c) bsiforewordthis document (en 936:2006) 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 february 2007, and conflicting national standards shall be withdrawn at the latest by february 2007.this european standard supersedes en 936:1997.significant technical differences between this edition and en 936:1997 are as follows:a) deletion of the reference to eu directive 80/778/eec of july,15 1980 in order to take into account of the last directive in force (see 1);b)updating of the transportation regulations and labelling.c)the requirement for carbon dioxide content is now only 99% instead of 99.7% in the latest editionaccording to the cen/cenelec internal regulations, the national standards organizations of the following countries are bound to implement this european standard: austria, belgium, 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.licensed copy: x x, the university of sheffield, 03/07/2009 16:44, uncontrolled copy, (c) bsiintroductionin respect to the 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;d)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.noteconformity 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.licensed copy: x x, the university of sheffield, 03/07/2009 16:44, uncontrolled copy, (c) bsi1scopethis european standard 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.2description2.1identification2.1.1chemical namecarbon dioxide.2.1.2synonym or common namecarbonic acid gas (carbonic anhydride).2.1.3relative molecular mass44,0empirical formulacochemical formulacocas registry number 1)124-38-einecs reference2)204-696-9.2.2commercial formthe carbon dioxide is supplied as a liquefied gas.notethe solid form is not usually used for the treatment of water intended for human consumption.1) chemical abstracts service registry number.2) european inventory of existing commercial chemical substances.licensed copy: x x, the university of sheffield, 03/07/2009 16:44, uncontrolled copy, (c) bsi2.3physical properties2.3.1appearancethe carbon dioxide is a colourless gas or liquid.2.3.2densitythe density of the gas at 0 c and 101,3 kpa 3) is 1,9 768 kg/m3, while the density of the liquid at 0 c and4 000 kpa is 933,318 kg/msolubility in waterthe solubility of the gas in water is 1,72 g/l at 20 c and 101,3 kpa.2.3.4vapour pressurethe vapour pressure of the liquid is 5 733,0 kpa at 20 c.2.3.5boiling point at 100 kpa3)(see 2.3.6).2.3.6melting pointthe sublimation point of solid co2 is -78,9 c (and 101,3 kpa).2.3.7specific heatthe specific heat of carbon dioxide is 0,827 kj/kg x k at 0 c and 100 kpa.2.3.8viscosity (dynamic)the viscosity of the liquid is 147 x 10-7 pa x s at 20 c.2.3.9critical temperaturethe critical temperature of the liquid is 31 c.2.3.10 critical pressurethe critical pressure of the carbon dioxide is 7 883 kpa.2.3.11 physical hardnessnot applicable.2.4chemical propertiesthe carbon dioxide co2 forms a weak acid when dissolved in water. it reacts with alkalis to form carbonates and bicarbonates.3) 100 kpa = 1 bar.licensed copy: x x, the university of sheffield, 03/07/2009 16:44, uncontrolled copy, (c) bsi3purity criteria3.1generalthis 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.noteusers of this product should check the national regulations in order 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 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 impurities, by-products or additives being present, this shall be notified to the user.3.2composition of commercial productthe product shall contain at least a volume fraction of 99 % of co2 in bulk and in cylinder.notethe composition of the commercial product is defined in the eu directive 96/77/ec of december 2, 1996 (see3).3.3impurities and main by-productsthe residual gas content consists mostly of nitrogen, oxygen and moisture.3.4chemicals parametersnotethe chemical parameters and indicator parameters according to eu directive 98/83/ec (see 1) are not found in the gaseous phase. pesticides and polycyclic aromatic hydrocarbons are not by-products of the manufacturing process.4test methods4.1samplingobserve the recommendations of isbt “carbon dioxide quality guidelines and analytical procedurebibliography march 2001” (see 4).4.2analysis4.2.1carbon dioxidemeasure 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 (v2) which is measured after absorption of co2 is to subtract from (v1). the difference (v1 - v2) = v3 is equivalent to the volume part of co2 (equipment: orsat, zahm, hasselberg).note 1 observe the recommendations of international society of beverage technologists (isbt) “carbondioxide guidelines and analytical procedure bibliography march 2001” (see 4).note 2alternatively the carbon dioxide may be determined by gas-chromatography.licensed copy: x x, the university of sheffield, 03/07/2009 16:44, uncontrolled copy, (c) bsi4.2.2impuritiesdetermine the volume of gas impurity (see 4.2.1).note: alternatively, the impurities content may be determined by gas chromatography.5labelling - transportation - storage5.1means of deliverythe carbon dioxide shall be delivered both in pressurized containers vessels (tanks or cylinders).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.5.2risk and safety labelling according to the eu directives4)carbon dioxide is not subject to labelling regulations at the date of publication of this european standard.noteannex i of the directive 67/548/eec on classification, 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 t he person responsible for the marketing of the substance.5.3transportation regulations and labellingthe labelling of tanks and cylinders is as follows:a)liquid carbon dioxide is listed as un number5) 1013 and refrigerated carbon dioxide is listed as un number 2187;4) see 2.5) united nations number.licensed copy: x x, the university of sheffield, 03/07/2009 16:44, uncontrolled copy, (c) bsib)under the rid 6), the adr7) and the imdg8) regulations, liquid carbon dioxide and refrigerated carbon dioxide is designated (with label 2.2).5.4markingthe marking shall include the following information: name carbon dioxide and the trade name; net mass; name and the address of the supplier and/or manufacturer; statement this product conforms to en 936.5.5storagethe product is stable during long term storage.pressure vessels containing carbon dioxide shall be protected from direct heat and the storage rooms shall be well-ventilated, especially if they are below ground level. cylinders shall preferably be stored horizontally; if upright, they shall be secured to prevent them toppling over.6) regulations concerning international carriage of dangerous goods by road.7) european agreement concerning the international carriage of dan