1、Designation: D 2110 00 (Reapproved 2006)Standard Test Method forpH of Water Extractions of Halogenated Organic Solventsand Their Admixtures1This standard is issued under the fixed designation D 2110; the number immediately following the designation indicates the year oforiginal adoption or, in the c
2、ase of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) 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 org
3、anic 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 u
4、ser 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 extractdetermin
5、ed 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
6、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 withinth
7、ese 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 epoxidestab
8、ilizers 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:
9、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
10、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 d
11、istilled 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 Procedure BUsing a pH meter, titrate a
12、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
13、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 solven
14、t 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 E
15、xtinguishing Agents and is the directresponsibility of Subcommittee D26.04 on Test Methods.Current edition approved Jan. 1, 2006. Published February 2006. Originallyapproved in 1962 as D 2110-62 T. Last previous edition approved in 2000 as D2110-00.2Available from suppliers of reagent chemicals such
16、 as Fisher Scientific,Houston, TX or Aqua Solutions, Deer Park, TX.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.to separate. Drain and discard the halogenated solvent layerand transfer the water extract to a 100-mL beaker. Determi
17、nethe pH of the water extract by either Procedure A or B.6.2 Procedure APipet 2 mL of Universal Indicator intothe water extract, stir, and compare the resultant color to thecolor chart per manufacturers instructions. The pH of thewater extract is that of the pH of the closest matching color onthe co
18、lor 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 meter, 60.2 pH unit; andfor multilaboratory, 60.9 pH unit.7.2 Bias has not been d
19、etermined.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 this standard. Users of this standard are expressly advised that determination of
20、the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Y
21、our comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your commen
22、ts 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, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or mu
23、ltiple 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).3Supporting data have been filed at ASTM headquarters and may be obtained byrequesting Research Report RR D26-1007.D 2110 00 (2006)2
