ASTM_D_5070_-_90_2014.pdf

Designation:D507090(Reapproved 2014)Standard Test Method forSynthetic Quaternary Ammonium Salts in Fabric Softenersby Potentiometric Titrations1This standard is issued under the fixed designation D5070;the number immediately following the designation indicates the year oforiginal adoption or,in the case 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 describes a potentiometric titrationprocedure for the determination of quaternary ammonium saltsin fabric softeners.This test method is intended for the analysisof known quaternary ammonium salts such as the dialkyldimethyl quaternary ammonium compound type and the di-amidoamine based quaternary ammonium compound type.1.2 The quaternary ammonium salts conform to the struc-tures shown in Fig.1 and Fig.2.1.3 The analytical procedure appears in the following order:SectionApparatus5Reagents6Preparation of standard reagents7Standardization of hyamine solution9Safety precautions8Procedure for determination of dialkyl dimethyl quaternaries10Procedure for determination of diamidoamine based quaternaries111.4 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.5 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.See 6.4,6.6,6.7and Section 8 for specific warning statements.2.Referenced Documents2.1 ASTM Standards:2D1193 Specification for Reagent WaterD3049 Test Method for Synthetic Anionic Ingredient byCationic Titration3.Summary of Test Method3.1 Quaternary ammonium compounds present in fabricsofteners,as the active materials,are titrated potentiometricallyin an aqueous medium with a standard solution of sodiumlauryl sulfate using a nitrate ion-selective electrode.In thispotentiometric titration,the reaction involves the formation ofa complex between the quaternary ammonium compound andthe anionic surfactant which then precipitates.At the end point,the nitrate ion electrode appears to respond to an excess oftitrant with a potential change large enough to give a welldefined inflection in the titration curve.Alternatively thequaternary ammonium compound can be first complexed withan excess of standard sodium lauryl sulfate;the excess sodiumlauryl sulfate is titrated potentiometrically with standardHyamine 1622.34.Significance and Use4.1 This test method is used to determine the quaternaryammonium salts commonly found in fabric softeners.Quater-nary ammonium compounds being the active ingredients infabric softeners requires accurate determination to assess thecost and performance of such compounds.5.Apparatus5.1 Autotitration Systemburet with 10 or 20 mL capacity;4magnetic stirrer;5evaluating ruler.65.2 Electrodes(1)nitrate specific ion electrode;7(2)sur-factant electrode;8(3)Ag/AgCl reference electrode.91This 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 Soaps,Synthetics,Detergents and their Components.Current edition approved Jan.1,2014.Published February 2014.Originallyapproved in 1990.Last previous edition approved in 2005 as D5070-90(2005).DOI:10.1520/D5070-90R14.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3The sole source of supply of Hyamine 1622 known to the committee at thistime is Gallard Schlesinger Manufacturing Corp.,584 Mineola Ave.,Carle Place,NY 11514.If you are aware of alternative suppliers,please provide this informationto ASTM Headquarters.Your comments will receive careful consideration at ameeting of the responsible technical committee,which you may attend.4Metrohm-Brinkman E-536,or equivalent,has been found satisfactory.Avail-able from Brinkman Instruments Inc.,Cantiague Rd.,Westbury,NY 11590.5Potentiograph/E-535 and Dosimat/E-459,or equivalent,have been foundsatisfactory.Available from Brinkman Instruments Inc.,Cantiague Rd.,Westbury,NY 11590.6Evaluating Ruler EA-893,or equivalent,has been found satisfactory.Availablefrom Brinkman Instruments Inc.,Cantiague Rd.,Westbury,NY 11590.7Orion Model 93.07,or equivalent,has been found satisfactory.Available fromOrion Research Inc.,529 Main St.,Boston,MA 02129.8Orion Model 93.42,or equivalent,has been found satisfactory.Available fromOrion Research Inc.,529 Main St.,Boston,MA 02129.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.3 Adaptors(1)coaxial adaptor,required for ind