ASTM_D_2110_-_00_2012.pdf

Designation:D211000(Reapproved 2012)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 and health practices and determine the applica-bility of regulatory limitations prior to use.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 50mL 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 per manufacturers instructions)with either 0.01N HCl if the pH is above 7 or 0.01 N NaOH if the pH is below7,and record the titer.From this titer,calculate and add thevolume of 0.01 N NaOH or 0.01 N HCl required to adjust theremaining 950 mL of the boiled distilled or deionized water toa pH of 7.The amount of 0.01 N NaOH or 0.01 N HCl neededto neutralize the 950 mLwater will be 19 X titer.Determine thepH of a second aliquot.If further adjustment is necessary toobtain a pH of 7,repeat the above procedure.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 or 0.01N HCl required to adjust the remaining 950 mL of the boileddistilled or deionized water to a pH pf 7.0 to 7.3.The amountof 0.01 N NaOH or 0.01 N HCl needed to neutralize the 950mL water will be 19 X titer.Determine the pH of a secondaliquot.If further adjustment is necessary to obtain a pH of 7.0to 7.3,repeat the above procedure.6.Procedure6.1 Transfer 50 mL of the halogenated organic solvent to a250-mL separatory funnel containing 50 mL of freshly boiled,neutral,distilled or freshly boiled,neutral,deionized water.Shake the mixture for 2 min;then let stand and allow the layers1This 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 March 1,2012.Published May 2012.Originallyapproved in 1962 as D2110-62 T.Last previous edition approved in 2006 asD2110-00(2006).DOI:10.1520/D2110-00R12.2Available 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 States1 to separate.Drain and discard the halogenated solvent layerand transfer the water extract to a 100-mL beaker.Determinethe pH of the water extract by either Procedure A or B.6.2 Procedure APipet 2 mLof Universal Indicator into thewater extract,stir,and compare the resultant color to the colorchart per manufacturers instructions.The pH of the waterextract is that of the pH