1、Designation:D136422Standard Test Method forWater in Volatile Solvents(Karl Fischer Reagent TitrationMethod)1This standard is issued under the fixed designation D1364;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last re
2、vision.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.1.Scope1.1 This test method covers the determination of
3、water involatile solvents and chemical intermediates used in paint,varnish,lacquer,and related products.1.2 This test method is not applicable in the presence ofmercaptans,peroxides,or appreciable quantities of aldehydesor amines.1.3 For purposes of determining conformance of an ob-served or a calcu
4、lated value using this test method to relevantspecifications,test result(s)shall be rounded off“to the nearestunit”in the last right-hand digit used in expressing thespecification limit,in accordance with the rounding-off methodof Practice E29.1.4 The values stated in SI units are to be regarded ass
5、tandard.No other units of measurement are included in thisstandard.1.5 For hazard information and guidance,see the suppliersMaterial Safety Data sheet.1.6 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 st
6、andard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.7 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision o
7、n 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:2D1500 Test Method for ASTM Color of Petroleum Products(ASTM Color Scale)E29 Practice for Us
8、ing Significant Digits in Test Data toDetermine Conformance with Specifications3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 instrumental end point,nthat point in the titrationwhen two small platinum electrodes,upon which a potential of20 to 50 mV has been impressed,are depol
9、arized by theaddition of 0.05 mL of Karl Fischer reagent(6 mg of H2O permL),causing a change of current flow of 10 to 20 A thatpersists for at least 30 s.NOTE1This end point is sometimes incorrectly called the“dead stop”which is the reverse of the above.3.1.2 color end point,nduring the titration,th
10、e solutionfirst turns yellow,then later deepens towards the end of thetitration;the end point is indicated by the change from yellowto orange-red which is quite sharp and easily repeated;theorange-red color must persist for at least 30 s in order toindicate an end point.NOTE2View the color by transm
11、itted daylight or by transmitted lightfrom an artificial daylight lamp,such as the one that complies with thespecifications given in Test Method D1500.4.Summary of Test Method4.1 This test method is based essentially upon the reductionof iodine by sulfur dioxide in the presence of water.Thisreaction
12、 can be used quantitatively only when pyridine and analcohol are present to react with the sulfur trioxide andhydriodic acid produced according to the following reactions:H2O1I21SO213C5H5N2C5H5NHI1C5H5NSO3(1)C5H5NSO31ROHC5H5NHSO4R1This test method is under the jurisdiction of ASTM Committee D01 on P
13、aintand Related Coatings,Materials,and Applications and is the direct responsibility ofSubcommittee D01.35 on Solvents,Plasticizers,and Chemical Intermediates.Current edition approved Jan.1,2022.Published January 2022.Originallyapproved in 1955.Last previous edition approved in 2012 as D1364 02(2012
14、)which was withdrawn January 2021 and reinstated in January 2022.DOI:10.1520/D1364-22.2For 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
15、 onthe ASTM website.Copyright 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 theDevel
16、opment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.14.2 To determine water,Karl Fischer reagent(a solution ofiodine,pyridine,and sulfur dioxide,in the molar ratio of1+10+3)dissolved in anhydrous 2-methoxyethanol is addedto a solution of the sample in anhydrous pyridine-ethyleneglycol(1+4)until all water present has been consumed.Thisis evidenced by the persistence of the orange-red end-pointcolor;or altern
