1、Designation:D617397(Reapproved 2014)Standard Test Method forDetermination of Various Anionic Surfactant Actives byPotentiometric Titration1This standard is issued under the fixed designation D6173;the number immediately following the designation indicates the year oforiginal adoption or,in the case
2、of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method is based on a potentiometric titration ofcommon anionic surfactants and blends of
3、anionic surfactantwith a hydrotrope.This test method solely is intended for theanalysis of active matter in the following surfactants:alcoholether sulfate,alpha olefin sulfonate,alkylbenzene sulfonicacid,alcohol sulfate,sodium alkylbenzene sulfonate/sodiumxylene sulfonate blend(5:1),sodium alkylbenz
4、ene sulfonate/sodium xylene sulfonate blend(16:1),and sodium alkylben-zene sulfonate/sodium xylene sulfonate blend(22:1).It has notbeen tested for surfactant formulations.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.3 Th
5、is standard does not purport to address all the safetyconcerns,if any,associated with its use.It is the responsibilityof the user of this standard to establish appropriate safety andhealth practices and determine the applicability of regulatorylimitations prior to use.Material Safety Data Sheets are
6、available for reagents and materials.Review them for hazardsprior to usage.2.Referenced Documents2.1 ASTM Standards:2D459 Terminology Relating to Soaps and Other DetergentsD1681 Test Method for Synthetic Anionic Active Ingredientin Detergents by Cationic Titration ProcedureD3049 Test Method for Synt
7、hetic Anionic Ingredient byCationic Titration3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 active matter,nthe organic surface-active materialpresent in the detergent.Also defined in Terminology D459 asactive ingredient of detergents.4.Summary of Test Method4.1 This test metho
8、d describes a potentiometric titrationprocedure for determining active matter in anionic surfactant.The anionic surfactant is first dissolved in water,and the pH ofthe solution is adjusted according to the type of anionicsurfactant being measured.In the potentiometric titration theanionic surfactant
9、 is titrated with a standard solution ofHyamine using a surfactant electrode,and the reaction involvesthe formation of a complex between the anionic surfactant andthe cationic titrant(Hyamine),which then precipitates.At theend point the surfactant electrode appears to respond to anexcess of titrant
10、with potential change large enough to give awell defined inflection in the titration curve.5.Significance and Use5.1 The most common anionic surfactants presented in thistest method are used widely in synthetic detergents and otherhousehold cleaners.Current analysis of the active matter inthese anio
11、nic surfactants involves the two-phase aqueous/chloroform titration with a mixed indicator,organic dyes suchas disulphine blue/dimidium bromide(see Test MethodD3049),and methylene blue(see Test Method D1681).Thistest method eliminates the use of hazardous chloroform,theuse of which is restricted for
12、 environmental and toxicologicalreasons.5.2 This test method also describes the titration of variousratio blends of sodium alkylbenzene sulfonate and sodiumxylene sulfonate.Active matter content in these blends isattributable directly to sodium alkylbenzene sulfonate.Therefore,the presence of variou
13、s amounts of sodium xylenesulfonate in these blends does not interfere with the determi-nation of percent actives.1This test method is under the jurisdiction of ASTM Committee D12 on Soapsand Other Detergents and is the direct responsibility of Subcommittee D12.12 onAnalysis and Specifications of So
14、aps,Synthetics,Detergents and their Components.Current edition approved Jan.1,2014.Published February 2014.Originallyapproved in 1997.Last previous edition approved in 2005 as D6173-97(2005).DOI:10.1520/D6173-97R14.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Cus
15、tomer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 6.Apparatus6.1 Autotitration System,equip
16、ped with a delivery buretsystem,10 or 20-mL capacity.3,46.2 Phoenix Surfactant Combination Electrode,3,4nitratespecific ion electrode,or surfactant electrode4,5equipped withsilver/silver chloride reference electrode.5The conditioning ofthis type of electrode is essential for obtaining a good break inthe titration curve.Therefore,each electrode should be condi-tioned in sodium lauryl sulfate 0.0001M solution for 15 min.For other electrode requirements,follow the manufacturersinstruction manual.6.
