E S00TS00 E06TSh -E H-/4~/2 1-14-010 ISO INTERNATIONAL STANDARD 6843 First edition 1988-06-15 INTERNATIONALORGANIZATIONFOR STANDARDIZATION ORGANISATION INTERNATIONALEDE NORMALISATION ME>KAYHAPOAHAAOPAHW3ALMHIOCTAHAAPTM3ALMM Surface active agents - Sulfated ethoxylated alcohols and alkylphenols - Estimation of the mean relative molecular mass Agents de surface - Sulfates d'alcools et dalkylphenols ethoxyles - Evaluation de la masse moleculaire relative moyenne Reference number ISO 6843 : 1988 (E) COPYRIGHT 2ooo International Organization For Standardization Information Handling Services, 2oo0 S 900TS00 E06TS9h -E ISO 6843 : 1988 (E) Foreword Iso (the International Organizationfor Standardization)is a worldwide federation of national standards bodies (iso member bodies).The work of preparing International Standards isnormallycarriedoutthroughIsotechnical committees.Eachmember body interested in a subject for which a technical committee has been established has the righttobe representedonthat committee.International organizations,govern- mental and non-governmental, in liaison with iso, also take part in the work. iso collaborates closely with the international Electrotechnical Commission (IEC) on all mattersofelectrotechnical standardization. Draft InternationalStandardsadoptedbythetechnicalcommitteesare circulatedto the member bodies for approval before their acceptance as International Standards by the Iso Council. They are approved in accordance with Iso procedures requiring at least 75 % approval by the member bodies voting. International Standard ISO 6843 was prepared by Technical Committee ISO/TC 91, Surfaceactiveagents. AnnexAformsanintegralpartofthisInternationalStandard. @ International Organizatlon for Standardization, 1988 Printed in Switzerland CoPYRIGHT 2ooo International Organization For Standardization Information Handling Services, 2oo0 6843-88 EO6TSh 200T500 8 INTERNATIONALSTANDARD ISO6843:1988 (E) Surface active agents - Sulfated ethoxylated alcohols and alkylphenols- Estimation of the mean relative molecular mass 1 Scope 3 Principle This International Standard specifies a method for the esti- From a solution of the test portion saturated with sodium mation of the mean relative molecular mass of the anionic- chloride, extraction of alkylether sulfate with an ethyl active matter present in ordinarycommercial neutralized acetate/butan-1-ol mixture, then evaporation of the aqueous products of sulfation of ethoxylated alcohols or alkyiphenols phase containing the polyglycol, the polyglycol sulfate and [alkyl oxyethylenesulfates (ethoxylated alcoholsulfates)or possibly traces of ether sulfates; then removal of salts from the alkylphenol oxyethylene sulfates (ethoxylated alkylphenol residue by treatment with methanol and filtration. sulfates)] containing an average of not more than 20 oxy- ethylene groups permolecule. Evaporation of an aliquot portion of the filtrate and weighing of the residue, then redissoiution in water and determination of It also sets out, in annex A, a general scheme of analysis the sodium chloride and anionic-active matter contents. Determination of the polyglycol content by passing the remain- Normativereferences ing fraction of filtrate through an ion-exchange resin. 2 Determination of the polyglycol sulfate content by difference The following standards contain provisions which, through between the above determinations. referenceinthistext,constituteprovisionsofthisInternational Standard. At the time of publication, the editions indicated From the content of anionic surface active agent (alkylether were valid. All standards are subject to revision, and parties to sulfate) and the anionic surface active matter content deter- agreements based on this International Standard are encour- aged to investigate the possibility of applying the most recent mined by two-phase titration, estimation of the mean relative editions of the standards listed below. Members of IEC and ISO molecularmass. maintain