1、Designation: D2110 00 (Reapproved 2017)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 cas
2、e 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 organi
3、c 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
4、 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 t
5、he 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
6、 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 halog
7、enated 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 reclaim
8、ed 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 thi
9、s 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
10、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 o
11、f 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
12、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 mL water 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 Proc
13、edure 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 boileddisti
14、lled 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 second1This test method is under the jurisdiction of ASTM Committee D26 onHalogenated Organic Solvents and Fire Extinguishing Agents an
15、d is the directresponsibility of Subcommittee D26.04 on Test Methods.Current edition approved Nov. 1, 2017. Published December 2017. Originallyapproved in 1962 as D2110-62 T. Last previous edition approved in 2012 asD2110-00 (2012). DOI: 10.1520/D2110-00R17.2Available from suppliers of reagent chemi
16、cals 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 standardi
17、zation 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 7.0to 7.3, repeat the above pro
18、cedure.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 layersto separate. Drain and discard the h
19、alogenated 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 mL of Universal Indicator into thewater extract, stir, and compare the resultant color to the colorchart per manufacturers instructions. T
20、he pH of the waterextract is that of the pH of the closest matching color on thecolor chart.6.3 Procedure BDetermine the pH of the water extract tothe nearest 0.1 pH unit with a pH meter.7. Precision and Bias37.1 The precision for Procedure A, Universal Indicator, is60.5 pH unit; for Procedure B, pH
21、 meter, 60.2 pH unit; andfor multilaboratory, 60.9 pH unit.7.2 Bias has not been determined.8. Keywords8.1 acidity; alkalinity; halogenated organic solvents; pH;solventsASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin
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24、esponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700,
25、 West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ data have been filed at ASTM headquarters and may be obtained byrequesting Research Report RR D26-1007.D2110 00 (2017)2
