ASTM_D_1631_-_10_2018e1.pdf

Designation:D163110(Reapproved 2018)1Standard Test Method forWater in Phenol and Related Materials by the IodineReagent Method1This standard is issued under the fixed designation D1631;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.This standard has been approved for use by agencies of the U.S.Department of Defense.1NOTESection 14 was editorially corrected in February 2018.1.Scope*1.1 This test method covers the determination of water inphenol and related materials such as cresols,xylenols,naphthalene,pyridine,and quinoline.1.2 This test method has been found applicable to a varietyof materials varying in water content from 100 mg/kg tosolutions containing a relatively high percent of water.1.3 In determining the conformance of the test results usingthis method to applicable specifications,results shall berounded off in accordance with the rounding-off method ofPractice E29.1.4 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,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.For specific hazard statements,see Section 9.1.6 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D1364 Test Method for Water in Volatile Solvents(KarlFischer Reagent Titration Method)D3437 Practice for Sampling and Handling Liquid CyclicProductsD3852 Practice for Sampling and Handling Phenol,Cresols,and Cresylic AcidD4790 Terminology of Aromatic Hydrocarbons and RelatedChemicalsD6809 Guide for Quality Control and Quality AssuranceProcedures for Aromatic Hydrocarbons and Related Ma-terialsE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with SpecificationsE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method2.2 Other Document:3OSHA Regulations,29 CFR paragraphs 1910.1000 and1910.12003.Terminology3.1 See Terminology D4790 for definition of terms used inthis test method.4.Summary of Test Method4.1 When solutions of iodine in methanol and of sulfurdioxide in pyridine are mixed in the presence of water,thefollowing reaction occurs:I21SO21H2O2HI1SO3(1)4.1.1 Sufficient pyridine is present in the reagent to consumethe hydriodic acid and sulfur trioxide:1This test method is under the jurisdiction of ASTM Committee D16 onAromatic,Industrial,Specialty and Related Chemicals and is the direct responsi-bility of Subcommittee D16.02 on Oxygenated Aromatics.Current edition approved Feb.15,2018.Published February 2018.Originallyapproved in 1959.Last previous edition approved in 2010 as D1631 10.DOI:10.1520/D1631-10R18E01.2For 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.3Available from U.S.Government Printing Office,Superintendent ofDocuments,732 N.Capitol St.,NW,Washington,DC 20401-0001,http:/www.access.gpo.gov.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 4.1.2 The pyridine sulfur trioxide salt reacts with themethanol,this preventing a second mole of water from beingconsumed:4.2 When the pyridine solution contains water and the sulfurdioxide is titrated with iodine in methanol solution,theplatinum electrodes remain polarized until all the water reacts.A slight excess of iodine depolarizes the electrodes,allowingcurrent to flow through the microammeter which indicates theend point.5.Significance and Use5.1 This test method is particularly useful for determiningsmall amounts of water in hygroscopic materials.This testmethod is suitable for setting specifications on materialsreferenced in the scope.It may also be used as an internalquality control tool and in development or research work.6.Interferences6.1 This t