ASTM_D_2110_-_00_2022.pdf

Designation:D211000(Reapproved 2022)Standard Test Method forpH of Water Extractions of Halogenated Organic Solventsand Their Admixtures1This standard is issued under the fixed designation D2110;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 covers the measurement of the pH ofwater extractions of halogenated organic solvents and admix-tures thereof.This test method is applicable for the determina-tion of the pH of water extractions of virgin,reclaimed,or usedsolvents.1.2 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.1.3 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.Summary of Test Method2.1 The solvent sample is shaken with freshly boiled neutraldistilled or deionized water and the pH of the water extractdetermined by one of two procedures:2.1.1 Procedure A,by comparing the color formed upon theaddition of Universal Indicator with that of a calibrated pHIndicator Color Chart,or2.1.2 Procedure B,using a glass electrode pH meter.3.Significance and Use3.1 The pH of halogenated solvents varies according to thenature of stabilizers in the particular solvent.Solvents withalkaline stabilizers(amine-types)generally have pHs in the 7to 11 range,whereas solvents containing neutral stabilizers(epoxide-types)generally have pHs in the 5 to 7 range.3.2 Virgin and reclaimed solvents should have pHs withinthese ranges,dependent upon the claimed method of stabiliza-tion.These values should be within the accepted limits asproposed by the producers of the original virgin solvent.3.3 A lowering of pH from the above values,on receipt oruse,is cause for concern.In this event,solvents having epoxidestabilizers should be tested for acid acceptance;solvent havingalkaline stabilizers should be tested for alkalinity.4.Apparatus4.1 Universal Indicator2and pH Indicator Color Chart(Procedure A),2or4.2 pH Meter(Procedure B).5.Water5.1 Neutral Distilled or Deionized Water shall be preparedas follows:Boil 1 L of distilled or deionized water for 5 min ina borosilicate glass or stainless steel container,then cover andcool to room temperature.5.2 Procedure ATo a 50 mL aliquot of the cooled,boiledwater,add 2 mL of Universal Indicator.Titrate the aliquot to apH of 7(as indicated by comparing the color of the aliquot tothe color chart in accordance with manufacturers instructions)with either 0.01 N HCl if the pH is above 7 or 0.01 N NaOH ifthe pH is below 7,and record the titer.From this titer,calculateand add the volume of 0.01 N NaOH or 0.01 N HCl requiredto adjust the remaining 950 mL of the boiled distilled ordeionized water to a pH of 7.The amount of 0.01 N NaOH or0.01 N HCl needed to neutralize the 950 mLwater will be 19 Xtiter.Determine the pH of a second aliquot.If further adjust-ment is necessary to obtain a pH of 7,repeat the aboveprocedure.5.3 Procedure BUsing a pH meter,titrate a 50 mL aliquotto a pH of 7.0 to 7.3 with either 0.01 N HCl if the pH is above7.0 or 0.01 N NaOH if the pH is 7.0 and record the titer.Fromthis titer,calculate and add the volume of 0.01 N NaOH or0.01 N HCl required to adjust the remaining 950 mL of theboiled distilled or deionized water to a pH pf 7.0 to 7.3.Theamount of 0.01 N NaOH or 0.01 N HCl needed to neutralize the950 mL water will be 19 X titer.Determine the pH of a second1This test method is under the jurisdiction of ASTM Committee D26 onHalogenated Organic Solvents and Fire Extinguishing Agents and is the directresponsibility of Subcommittee D26.04 on Test Methods.Current edition approved May 1,2022.Published May 2022.Originallyapproved in 1962 as D2110-62 T.Last previous edition approved in 2017 asD2110-00(2017).DOI:10.1520/D2110-00R22.2Available from suppliers of reagent chemicals such as Fisher Scientific,Houston,TX or Aqua Solutions,Deer Park,TX.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 theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1aliquot.If further adjustment is necessary to obtain a pH of