1、BRITISH STANDARD BS EN ISO 6845:2003 ISO 6845:1989 Incorporating Amendment N o s . 1 a n d 2 t o BS 6829-2.2:1989 (Amendment 2 renumbers the BS as BS EN ISO 6845:2003) Surface active agents Technical alkane sulfonates Determination of the mean relative molecular mass of the alkane monosulfonates and
2、 the alkane monosulfonate content The European Standard EN ISO 6845:2003 has the status of a British Standard ICS 71.100.40 BS EN ISO 6845:2003 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 November 1989 BSI 21 October 2003 ISBN 0 580 17
3、832 3 National foreword This British Standard is the official English language version of EN ISO 6845:2003. It is identical with ISO 6845:1989. The UK participation in its preparation was entrusted to Technical Committee CIC/34, which has the responsibility to: A list of organizations represented on
4、 this committee can be obtained on request to its secretary Additional information With reference to 5.2 and 5.3 the ethanol may be replaced by industrial methylated spirits complying with the requirements of BS 3591, or such spirits diluted as required. It should be noted that the use of industrial
5、 methylated spirits is governed by The Methylated Spirits Regulations, 1983 (S.I. 1983 No. 252). It is not permissible to use duty-free ethanol, received under the provisions of the Alcoholic Liquors Duties Act 1972, Section 10, for purposes for which industrial methylated spirits is an acceptable a
6、lternative. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic
7、Catalogue or of British Standards Online. 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 does not of itself confer immunity from legal obligations. aid enquirers to underst
8、and 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. Summary of pages This document comprises
9、a front cover, an inside front cover, the EN ISO title page, the EN ISO foreword page, the ISO title page, the ISO foreword page, pages 1 to 4, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued si
10、nce publication Amd. No. Date Comments 7846 15 August 1993 See national foreword 14444 21 October 2003 Implementation of the European StandardEUROPEANSTANDARD NORMEEUROPENNE EUROPISCHENORM ENISO6845 February2003 ICS71.100.40 Englishversion SurfaceactiveagentsTechnicalalkanesulfonates Determinationof
11、themeanrelativemolecularmassofthealkane monosulfonatesandthealkanemonosulfonatecontent(ISO 6845:1989) AgentsdesurfaceAlcanesulfonatestechniques Dterminationdelamassemolculairerelativemoyenne desalcanemonosulfonatesetdeleurteneur(ISO 6845:1989) GrenzflchenaktiveStoffeTechnischeAlkansulfonate Bestimmu
12、ngdermittlerenrelativenMolmassevon AlkanmonosulfonatenunddesGehaltesan Alkanmonosulfonat(ISO6845:1989) ThisEuropeanStandardwasapprovedbyCENon6December2002. CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEurope an Standardthestatusofanationalsta
13、ndardwithoutanyalteration.Uptodatelistsandbibliographicalreferencesconcernings uchnational standardsmaybeobtainedonapplicationtotheManagementCentreortoanyCENmember. ThisEuropeanStandardexistsinthreeofficialversions(English,French,German).Aversioninanyotherlanguagemadebytra nslation undertheresponsib
14、ilityofaCENmemberintoitsownlanguageandnotifiedtotheManagementCentrehasthesamestatusasthe official versions. CENmembersarethenationalstandardsbodiesofAustria,Belgium,CzechRepublic,Denmark,Finland,France,Germany,Greece, Hungary,Iceland,Ireland,Italy,Luxembourg,Malta,Netherlands,Norway,Portugal,SlovakR
15、epublic,Spain,Sweden,Switzerland and UnitedKingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG ManagementCentre:ruedeStassart,36B1050Brussels 2003CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.ENISO684
16、5:2003EINESO86:5402(30E) 2 Foreword ThetextofISO6845:1989hasbeenpreparedbyTechnicalCommitteeISO/TC91“Surface activeagents“oftheInternationalOrganizationforStandardization(ISO)andhasbeentaken overasENISO6845:2003byTechnicalCommitteeCEN/TC276“Surfaceactiveagents“,the secretariatofwhichisheldbyAFNOR. T
17、hisEuropeanStandardshallbegiventhestatusofanationalstandard,eitherbypublicationof anidenticaltextorbyendorsement,atthelatestbyAugust2003,andconflictingnational standardsshallbewithdrawnatthelatestbyAugust2003. AccordingtotheCEN/CENELECInternalRegulations,thenationalstandardsorganizationsof thefollow
18、ingcountriesareboundtoimplementthisEuropeanStandard:Austria,Belgium,Czech Republic,Denmark,Finland,France,Germany,Greece,Hungary,Iceland,Ireland,Italy, Luxembourg,Malta,Netherlands,Norway,Portugal,Slovakia,Spain,Sweden,Switzerlandand theUnitedKingdom. Endorsementnotice ThetextofISO6845:1989hasbeenap
19、provedbyCENasENISO6845:2003withoutany modifications. ENISO6845:2003INTERNATIONAL STANDARD ISO 6845 Second edition 1989-07- 15 Surface active agents - Technical alkane sulfonates - Determination of the mean relative molecular mass of the alkane monosulfonates and the alkane monosulfonate content Agen
20、ts de swface - Alcanesulfonates techniques - Determination de Ia rnol V is the volume, in millilitres, of the sodium hydroxide Solution (5.6) used for neutralization of the extracted monosulfonic acid ; Remove the flask (6.2) from the extractor (6.1) and evaporate to dryness on the water bath (6.9)
21、maintained at about 70 OC, while passing a gentle current of nitrogen over the surface of the liquid in Order to accelerate the evaporation, or evaporate using the rotary evaporator (6.12), on the water bath (6.9) maintained at between 25 OC and 40 OC, and under a vacuum produced by a water-jet suct
22、ion pump, for instance. c is the exact concentration, in moles of NaOH per litre, of the sodium hydroxide Solution (5.6). 9.1.2 Alkane monosulfonate content Dissolve the residue in 50 ml of the 95 % (Vl V) ethanol (5.2) and pass this Solution through the previously prepared cation- exchange column (
23、see 8.2). The alkane monosulfonate tonten t of the diluted sam expressed as a percentage by mass, is given by the formu Pk Ia ml x 100 mg Collect the eluate in the flat-bottomed flask (6.3) containing some antibumping granules and previously tared with its stop- per. Wash the column with 100 ml of t
24、he ethanol (5.2), collec- ting the washings in the flask. The alkane monosulfonate content of the raw material, expressed as a percentage by mass, is given b y the formula Add a few drops of the bromophenol blue Solution (5.7) to the eluate. Stir this Solution using the magnetic stirrer (6.11) and a
25、dd the sodium hydroxide Solution (5.6) by means of the burette (6.6) until a blue colour is obtained. ml x 100 1 X- mg f where Evaporate the neutralized Solution to dryness on the boiling water bath (6.8), while passing a gentle current of nitrogen over the surface of the Solution, or evaporate usin
26、g the rotary evaporator (6.12), on the water bath (6.9) maintained at be- tween 25 OC and 40 OC, and under a vacuum produced by a water-jet suction pump, for instance. mg is the mass, in grams, of the test Portion (8.1); ml is as defined in 9.1.1; f is the dilution factor of the laboratory Sample. 9
27、.2 Precision To eliminate the last traces of water, carry out the following procedure three times : dissolve the residue in 10 ml of the acetone (5.1) and evaporate to dryness on the boiling water bath (6.8), while passing a gentle current of nitrogen over the surface of the Solution, or by means of
28、 the rotary evaporator (6.12). 9.2.1 Mean relative molecular mass Comparative analyses on a Sample in the form of a homogeneous aqueous Solution containing about 25 % (m/m) of total soluble matter (comprising alkane mono-, di- and polysulfonates in the form of their sodium salts, sodium sulfate and
29、small quantities of Paraffins), carried out in 17 laboratories, have given the following statistical results: Dry the residue and the flask for 1 h in the vacuum oven (6.10), maintained at 120 OC & 2 OC, allow to cool in the desiccator and weigh the stoppered flask (6.3) to the nearest 1 mg. - mean (mean relative molecular mass) : 320 - Standard deviation of repeatability, 0,: 2,03 - Standard deviation of reproducibility, GR : 6,49 Repeat the operations of drying, cooling and weighing until the differente between two successive weighings does not exceed 1 mg. 3 ENISO6845:2003
