【BS英國標準】BS EN 898-1998 用于人類消費用水處理的化學試劑.碳酸氫鈉.doc

british standardchemicals used for treatment of water intended for human consumption sodium hydrogen carbonatethe european standard en 898:1998 has the status of abritish standardics 71.100.80| bs en 898:1998|no copying without bsi permission except as permitted by copyright lawbs en 898:1998national forewordthis british standard is the english language version of en 898:1998the uk participation in its preparation was entrusted to technical committeecii/59, chemicals for drinking water treatment, which has the responsibility to: aid enquirers to understand the text; present to the responsible european committee any enquiries on the interpretation, or proposals for change, and keep the uk interests informed; monitor related international and european developments and promulgate them in the uk.a list of organizations represented on this committee can be obtained on request to its secretary.the united kingdom voted against this standard at the cen formal vote stage because the limits of detection of some of the analytical methods, especially that for the determination of lead, are not adequate for the purpose of verifying conformity to the requirements specified in table 2.additional informationarticle 8 of the council of the european community directive 80/778/eec relating to the quality of water intended for human consumption requires member states to ensure that substances used in the preparation of drinking water do not cause any contravention of the maximum admissible concentrations prescribed in annex 1 to the directive.this requirement is given effect in england and wales by regulation 25 of the water supply (water quality) regulations 1989 (similar provisions apply in scotland and northern ireland). regulation 25 makes provision for attaching conditions of use to chemicals which are authorized for use in public water supplies.details of conditions of use are contained in the secretary of states list of approved products published by the drinking water inspectorate, floor 2/a1, ashdown house, 123 victoria street, london sw1e 6de.cross-referencesthe british standards which implement international or european publications referred to in this document may be found in the bsi standards catalogue under the section entitled international standards correspondence index, or by using thefind facility of the bsi standards electronic catalogue.a british standard does not purport to include all the necessary provisions of a contract. users of british standards are responsible for their correct application.compliance with a british standard does not of itself confer immunity from legal obligations.this british standard, having been prepared under the direction of the sector board for materials and chemicals, was published under the authority of the standards board and comes into effect on 15 july 1998bsi 1998isbn 0 580 29909 0summary of pagesthis document comprises a front cover, an inside front cover, the en title page, pages 2 to 8, an inside back cover and a back cover.amd. no.datetext affectedamendments issued since publicationeuropean standarden 898norme europe enneeuropa ische normfebruary 1998ics 71.100.80descriptors: potable water, water treatment, chemical compounds, sodium carbonates, description, physical properties, chemcial properties, impurities, toxic substances, tests, labelling, storage, utilizationenglish versionchemicals used for treatment of water intended for human consumption sodium hydrogen carbonateproduits chimiques utilise s pour le traitement de leau destine e a la consommation humaine hydroge nocarbonate de sodiumprodukte zur aufbereitung von wasser fu r den menschlichen gebrauch natriumhydrogencarbonatthis european standard was approved by cen on 16 january 1998.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, czech republic, denmark, finland, france, germany, greece, iceland, ireland, italy, luxembourg, netherlands, norway, portugal, spain, sweden, switzerland and united kingdom.ceneuropean committee for standardization comite europe en de normalisation europa isches komitee fu r normungcentral secretariat: rue de stassart 36, b-1050 brussels1998 cen all rights of exploitation in any form and by any means reserved worldwide for cen nationalmembers.ref. no. en 898:1998 epage 7en 898:1998bsi 1998forewordthis european standard has been prepared bytechnical committee cen/tc 164, water supply, thecontentspagesecretariat 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 august 1998, and conflicting national standards shall be withdrawn at the latest by august 1998.according to the cen/cenelec internal regulations, the national standards organizations of the following countries are bound to implement this european standard: austria, belgium, czech republic, denmark, finland, france, germany, greece, iceland, ireland, italy, luxembourg, netherlands, norway, portugal, spain, sweden, switzerland and the united kingdom.foreword 2introduction 31scope 32normative references 33description 33.1identification 33.2commercial forms 33.3physical properties 33.4chemical properties 44purity criteria 44.1general 44.2composition of commercial product 44.3impurities and main by-product 44.4toxic substances 45test methods 45.1sampling 45.2analyses 46labelling transportation storage 56.1means of delivery 56.2risk and safety labelling according tothe eu directives 56.3transportation regulations andlabelling 56.4marking 56.5storage 5annex a (informative) general informationon sodium hydrogen carbonate5annex b (normative) analytical methods6annex c (informative) bibliography 8introductionin respect of potential adverse effects on the quality of water intended for human consumption, caused by the product covered by this standard:1) this 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;2) 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.1 scopethis european standard is applicable to sodium hydrogen carbonate used for the treatment of water intended for human consumption. it describes the characteristics of sodium hydrogen carbonate and specifies the requirements and the corresponding test methods for sodium hydrogen carbonate. it gives information on its use in water treatment.2 normative referencesthis european standard incorporates by dated or undated reference, provisions from other publications. these normative references are cited at the appropriate places in the text and the publications are listed hereafter. for dated references, subsequent amendments to or revisions of any of these publications apply to this european standard onlywhen incorporated in it by amendment or revision. for undated references the latest edition of the publication referred to applies.en iso 3696, water for analytical laboratory use specification and test methods (iso 3696:1987).iso 746, sodium carbonate for industrial use determination of matter insoluble in waterat 50 degrees c.iso 2199, sodium hydrogen carbonate for industrial use determination of sodium hydrogen carbonate content titrimetric method.iso 2460, sodium hydrogen carbonate for industrial use determination of iron content 1,10-phenanthroline photometric method.iso 3165, sampling of chemical products for industrial use safety in sampling.iso 5666-1:1983, water quality determination of total mercury by flameless atomic absorption spectrometry part 1: method after digestion with permanganate-peroxodisulfate.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.3 description3.1 identification3.1.1 chemical namesodium hydrogen carbonate.3.1.2 synonym or common namessodium bicarbonate, bicarbonate of soda, baking soda.3.1.3 relative molecular mass84,0 empirical formulanahco chemical formulanahco cas registry number1)144-55- einecs reference2)205-633-8.3.2 commercial formssodium hydrogen carbonate as specified in this standard is technically water-free nahco3. the product is available as powder or crystals.3.3 physical properties3.3.1 appearancethe product is a white powder or crystals, slightly hygroscopic.3.3.2 densitysolid: 2,2 g/cm3.bulk density ranging from 0,5 kg/dm3 to 1,1 kg/dm solubility (in water)95 g/l at 20 8c.3.3.4 vapour pressurenot applicable.3.3.5 boiling point at 100 kpa3)not applicable.1) chemicals abstracts service registry number.2) european inventory of existing commercial chemical substances.3) 100 kpa = 1 bar.3.3.6 melting pointnot applicable. product decomposes at 50 8c.3.3.7 specific heat1,197 kj/(kgk).3.3.8 viscosity, dynamicnot applicable.3.3.9 critical temperaturenot applicable.3.3.10 critical pressurenot applicable.3.3.11 physical hardnessthe hardness of solid sodium hydrogen carbonate is given as 1,5 to 2 on mohs scale of hardness.3.4 chemical propertiessodium hydrogen carbonate reacts exothermically with acids with formation of carbon dioxide (co2).4 purity criteria4.1 generallimits have been given for impurities and toxic substances where these are likely to be present in significant quantities from the current production process and raw materials. if a change in the production process or raw materials leads tosignificant quantities of other impurities or by-products being present, this shall be notified to the user.4.2 composition of commercial productthe product shall contain not less than 98,5 % (m/m) ofnahco3.4.3 impurities and main by-productsthe product shall conform to the requirements specified in table 1.the concentration limits refer to nahco3.table 1 impuritiesimpuritylimit in mg/kg of nahco3iron(ii)1) max. insolubles2) max.52001) iron(ii) can cause organoleptic problems.2) indicates the presence of foreign matter.4.4 toxic substancesnote for the purpose of this standard, toxic substances are those defined in the directive 80/778/eec of 15 july, 1980 (see c.1).the content of toxic substances shall conform to the requirements specified in table 2.the concentration limits are specified in milligrams per kilogram of nahco3.table 2 toxic substanceselementlimit in mg/kg of nahco3arsenic (as) max. cadmium (cd) max. chromium (cr) max. mercury (hg) max. nickel (ni) max.lead (pb) max.2220,122note antimony, selenium, cyanides, pesticides and polycyclic aromatic hydrocarbons are not relevant toxic substances as listed in directive 80/778/eec because they are not likely to be found in the raw materials.5 test methods5.1 samplingtake a sample in accordance with iso 8213, taking account of iso 3165 and also iso 6206.5.2 analyses5.2.1 main productthe nahco3 content shall be determined by titration with a standard volumetric acid solution in accordance with iso 2 impurities ironthe iron content shall be determined by the spectrometric method with 1,10-phenanthroline in accordance with iso 24.2 insolublesthe percentage by mass % (m/m) of the insolubles in water shall be determined at 50 8c in accordance with iso 746, replacing sodium carbonate by sodium hydrogen carbonate.5.2.3 toxic substances generalthe concentrations of toxic substances, except for mercury, shall be determined by inductively coupled plasma optical emission spectrometry (icp/oes). arsenicthe arsenic concentration shall be determined by inductively coupled plasma optical emission spectrometry (icp/oes) (see b.1). cadmiumthe cadmium concentration shall be determined by inductively coupled plasma optical emission spectrometry (icp/oes) (see b.1). chromiumthe chromium concentration shall be determined by inductively coupled plasma optical emission spectrometry (icp/oes) (see b.1). mercurythe mercury concentration shall be determined by cold vapour atomic absorption spectrometry in accordance with iso 5666-1 (see b.2). nickelthe nickel concentration shall be determined by inductively coupled plasma optical emission spectrometry (icp/oes) (see b.1). leadthe lead concentration shall be determined by inductively coupled plasma optical emission spectrometry (icp/oes) (see b.1).6 labelling transportation storage6.1 means of deliverysodium hydrogen carbonate can be delivered in bulk, bulk bags or in bags.in order that the purity of the product is not affected, the means of delivery shall not have been used previously for any different product or it shall have been specially cleaned and prepared before use.6.2 risk and safety labelling according to theeu directives4)sodium hydrogen carbonate is not subject to labelling regulations.6.3 transportation regulations and labellingsodium hydrogen carbonate is not listed under a un number5). sodium hydrogen carbonate is not classified as a dangerous product for road, rail, sea and air transportation.6.4 markingeach container shall be marked with at least the following information: the name sodium hydrogen carbonate, the trade name and the grade; the net mass; the name and the address of supplier and/or manufacturer; the statement this product conforms to en 898.6.5 storage6.5.1 long term stabilitysodium hydrogen carbonate is stable up to 50 8c, in dry conditions.6.5.2 storage incompatibilitieskeep bags tightly closed and dry; keep away from acids.annex a (informative)general information on sodium hydrogen carbonatea.1 origina.1.1 raw materialssodium chloride, limestone, or sodium carbonate and carbon dioxide.a.1.2 manufacturing processammonia-soda-process (solvay process).a.2 usea.2.1 functionph stabilization and alkalinity increase.a.2.2 form in which the product is usedas a solution, at concentrations up to about 5 % (m/m).a.2.3 treatment dosevariable depending on raw water quality and application. treatment dose should be such that sodium ions never exceed sodium standard (see c.1).a.2.4 means of applicationthe treatment dose is usually applied using a positive displacement metering pump.a.2.5 secondary effectsincrease in sodium concentration.a.2.6 removal of excess productnot applicable.a.3 rules for safe handling and usecontact with eyes and skin should be avoided.a.4 emergency proceduresa.4.1 accident first aideye contact: rinse with running water for atleast 15 min to eliminate particles of the product.ingestion: plenty of water should be drunk.a.4.2 spillagethe product should be collected, then rinsed with plenty of water.a.4.3 firesodium hydrogen carbonate is not combustible.4) see c.2.5) united nations number.annex b (normative) analytical methodsb.1 determination of arsenic, cadmium, chromium, lead and nickel inductively coupled plasma optical emission spectrometry (icp/oes)b.1.1 generalthe range covered for each element is given inelementconcentration rangemg/kg of productcr, cdni as pb0,2 to 500,5 to 501 to 502 to 50table b.1.table b.1 concentration rangeb.1.3.8 argon, having a pressure not lessthan 700 kpa. the argon used may be compressed or liquefied gas.b.1.4 apparatusordinary laboratory apparatus and glassware, together with the following:note all vessels (glassware, polyethyl