【BS英国标准】BS EN 1202-1998 Chemicals used for treatment of water intended for human consumption. —ipotassium hydrogen orthophosphate.doc

british standardchemicals used for treatment of water intended for human consumption dipotassium hydrogen orthophosphatethe european standard en 1202 : 1997 has the status of abritish standardics 71.100.80| bs en1202 : 1998|licensed copy: sheffieldun sheffieldun, na, sat oct 28 14:49:09 gmt+00:00 2006, uncontrolled copy, (c) bsi|no copying without bsi permission except as permitted by copyright lawbs en 1202 : 1998national forewordthis british standard is the english language version of en 1202 : 1997.the uk participation in its preparation was entrusted to technical committeec11/59, chemicals for drinking water treatment, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/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 did not support this standard at the cen enquiry stage and voted against its acceptance at the formal vote stage. the principal uk objections were as follows.a) the various requirements in clause 4 are all expressed in terms of the dry product but the results of the determinations, by the methods specified in 5.2, are expressed as percentages of the product. there is no information on how the results are to be converted to a dry basis, nor is any method given for the determination of solids content of a solution.b) the sentence at the beginning of clause 5 allows the use of methods other than those described. the uk view is that only the reference method for a particular determination should be used in cases of dispute.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, room b153, romney house, 43 marsham street, london sw1p 3py.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.compliance with a british standard does not of itself confer immunity from legal obligations.summary 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.licensed copy: sheffieldun sheffieldun, na, sat oct 28 14:49:09 gmt+00:00 2006, uncontrolled copy, (c) bsiamd. no.datetext affectedthis 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 february 1998bsi 1998isbn 0 580 29046 8amendments issued since publicationeuropean standarden 1202norme europe enneeuropa ische normseptember 1997ics 71.100.80descriptors: potable water, water treatment, chemical compounds, orthosphates, potassium, description, physical properties, chemical properties, impurities, toxic substances, tests, labelling, storage, informationenglish versionchemicals used for treatment of water intended for human consumption dipotassium hydrogen orthophosphateproduits chimiques utilise s pour le traitement de leau destine e a la consommation humaine hydroge nophosphate de potassiumprodukte zur aufbereitung von wasser fu r den menschlichen gebrauch dikaliummonohydrogenphosphatlicensed copy: sheffieldun sheffieldun, na, sat oct 28 14:49:09 gmt+00:00 2006, uncontrolled copy, (c) bsithis european standard was approved by cen on 26 september 1997.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 brussels1997 cen all rights of exploitation in any form and by any means reserved worldwide for cen nationalmembers.ref. no. en 1202 : 1997 epage 7en 1202 : 1997bsi 1998forewordthis european standard has been prepared bytechnical committee cen/tc 164, water supply, thecontentspagelicensed copy: sheffieldun sheffieldun, na, sat oct 28 14:49:09 gmt+00:00 2006, uncontrolled copy, (c) bsisecretariat 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 march 1998, and conflicting national standards shall be withdrawn at the latest by march 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 21scope32normative references33description33.1identification33.2commercial form43.3physical properties43.4chemical properties44purity criteria44.1composition of commercial product44.2impurities and main by-products44.3toxic substances45test methods55.1sampling55.2analyses56labelling, transportation, storage66.1means of delivery66.2risk and safety labelling according to the eu directives66.3transportation regulations and labelling66.4marking66.5storage6annexesa(informative) general information on dipotassium hydrogen orthophosphate7b(informative) bibliography7introduction 3introductionin 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 describes the characteristics and specifies the requirements and the corresponding test methods for dipotassium hydrogen orthophosphate used for the treatment of water intended for human consumption. 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 26595water quality determination of total arsenic silver diethyldithiocarbamate spectrophotometric method(iso 6595 : 1982)en iso 3696water for analytical laboratory use specification and test methods(iso 3696 : 1987)iso 2997phosphoric acid for industrial use determination of sulfate content method by reduction and titrimetryiso 3165sampling of chemical products for industrial use safety in samplingiso 3360phosphoric acid and sodium phosphates for industrial use (including foodstuffs) determination of fluorine content alizarin complexone and lanthanum nitrate photometric methodiso 5666-1water quality determination of total mercury by flameless atomic absorption spectrometry part 1: method after digestion with permanganate-peroxodisulfateiso 5961water quality determination of cadmium by atomic absorption spectrometryiso 6206chemical products for industrial use sampling vocabularyiso 6703-1water quality determination of cyanide part 1: determination of total cyanideiso 8213chemical products for industrialuse sampling techniques solid chemical products in the form of particles varying from powders to coarse lumpsiso 8288water quality determination of cobalt, nickel, copper, zinc, cadmium and lead flame atomic absorption spectrometric methodsiso 9174water quality determination of total chromium atomic absorption spectrometric methodsiso 9965water quality determination of selenium atomic absorption spectrometric method (hydride technique)iso 11885water quality determination of33 elements by inductively coupled plasma atomic emission spectroscopy3 description3.1 identification3.1.1 chemical namedipotassium hydrogen phosphate.3.1.2 synonym or common namepotassium phosphate, dibasic. dipotassium hydrogen orthophosphate.3.1.3 relative molecular mass174, empirical formulak2hpo chemical formulak2hpo cas registry number1)7758-11-4.licensed copy: sheffieldun sheffieldun, na, sat oct 28 14:49:09 gmt+00:00 2006, uncontrolled copy, (c) bsi1)chemical abstracts service registry number.3.1.7 einecs reference2)231-834-5.3.2 commercial formdipotassium hydrogen orthophosphate is available in a number of different forms (see 3.3.1).different commercial forms, solids or dissolved in water are possible. all concentrations mentioned refer to the active matter and shall be calculated accordingly.note. dipotassium hydrogen orthophosphate can be a component of mixtures sold for water treatment purposes.3.3 physical properties3.3.1 appearance solid: white powder. liquid: clear solution.3.3.2 densitysolid: bulk density from 400 g/dm3.liquid: 1,040 g/ml for a product concentration of50 g/l at 20 8c.3.3.3 solubility in water4 purity criterialimits 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.4.1 composition of commercial productthe product shall conform to the following requirements on a dry mass basis: phosphate content expressed as p2o5: (41 1,0) %by mass (% (m/m); potassium content expressed as k2o: (53,5 1,0) %by mass (% (m/m).4.2 impurities and main by-productstable 1. impuritiesimpuritylimit of dry productmg/kg2fluoride (f) max.50010the product shall conform to the requirements specified in table 1.approximately 1590 g/l at 25 8c.3.3.4 vapour pressuresulfate (so4) max.not applicable.3.3.5 boiling point at 100 kpa3)not applicable.3.3.6 melting point1340 8c.3.3.7 specific heatnot known.3.3.8 viscosity (dynamic)solid: not applicable.liquid: 5 mpas for a product concentration of 50 g/l.3.3.9 critical temperaturenot applicable.3.3.10 critical pressurenot applicable.3.3.11 physical hardnessnot applicable.3.4 chemical propertiessolutions of dipotassium hydrogen orthophosphate have alkaline reactions.the ph value of a solution containing 1 % (m/m) is approximately 9 to 9,2.4.3 toxic substancesnote. for the purposes of this standard, toxic substances are those defined in the eu directive 80/778/eec of15 july, 1980 (see b.1).content of various metals depends on the origin of the raw materials; most of these elements are present only as traces.table 2. toxic substancesparameterlimit of dry productmg/kgantimony (sb) max. arsenic (as) max. cadmium (cd) max. chromium (cr) max. cyanide (cn) max. lead (pb) max. mercury (hg) max. nickel (ni) max. selenium (se) max.333105101103note. pesticides and polycyclic aromatic hydrocarbons, as listed in eu directive 80/778/eec, are not relevant in dipotassium hydrogen orthophosphate.the content of toxic substances shall conform to the requirements specified in table 2.licensed copy: sheffieldun sheffieldun, na, sat oct 28 14:49:09 gmt+00:00 2006, uncontrolled copy, (c) bsi2)european inventory of existing commercial chemical substances.3)100 kpa = 1 bar.licensed copy: sheffieldun sheffieldun, na, sat oct 28 14:49:09 gmt+00:00 2006, uncontrolled copy, (c) bsi5 test methodsit is recommended to use the following standards, but other methods giving the same results are allowed.5.1 sampling5.1.1 solidobserve the recommendations of iso 3165 and take account of iso 6206. prepare the laboratory sample(s) required by the relevant procedure described iniso 8 liquid sampling from drums and bottles.1 general.1.1 mix the contents of the container to be sampled by shaking the container, by rolling it or by rocking it from side to side, taking care not to damage the container or spill any of the liquid..1.2 if the design of the container is such (for example, a narrow-necked bottle) that it is impracticable to use a sampling implement, take a sample by pouring after the contents have been thoroughly mixed. otherwise, proceed as describedin .. examine the surface of the liquid. if there are signs of surface contamination, take samples from the surface as described in .2. otherwise, take samples as described in ..1.2 surface samplingtake a sample using a suitable ladle. lower the ladle into the liquid until the rim is just below the surface, so that the surface layer runs into it. withdraw the ladle before it fills completely and allow any liquid adhering to the ladle to drain off. if necessary, repeat this operation so that, when the other selected containers have been sampled in a similar manner, the total volume of sample required for subsequent analysis is obtained..3 bottom samplingtake a sample using an open sampling tube, or a bottom-valve sampling tube, suited to the size of container and the viscosity of the liquid.when using an open sampling tube, close it at the top and then lower the bottom end to the bottom of the container. open the tube and move it rapidly so that the bottom of the tube traverses the bottom of the container before the tube is filled. close the tube, withdraw it from the container and allow any liquid adhering at the outside of the tube to drain off.when using a bottom-valve sampling tube, close the valve before lowering the tube into the container and then proceed in a similar manner to that when using an open sampling tube. sampling from tanks and tankersfrom each access point, take samples as follows:a) from the surface of the liquid, using a ladle as described in .2;b) from the bottom of the tank or tanker, using a sampling tube as described in .3 or using a specially designed bottom-sampling apparatus;c) from one or more positions, depending on the overall depth, between the bottom and the surface using a weighted sampling can.5.2 analysesunless otherwise stated, the reagents shall be of a recognized analytical grade and the water used shall conform to g