1、Designation:D344400(Reapproved 2020)Standard Test Method forTotal Acid Number of Trichlorotrifluoroethane1This standard is issued under the fixed designation D3444;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revi
2、sion.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 determination of totalacidity in trichlorotrifluoroethane and other halocarbons thatare liquid at room t
3、emperature.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.3 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 establi
4、sh appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.Specific precautionary statements are given in Section 6.1.4 This international standard was developed in accor-dance with internationally recognized principles on standa
5、rd-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 total acidity of the solvent is determined by titrationwith s
6、tandard alcoholic potassium hydroxide solution usingphenolphthalein solution as the indicator.3.Significance and Use3.1 This test method determines the total acidity of trichlo-rotrifluoroethane by titration with alcoholic potassium hydrox-ide using phenolphthalein for an indicator.3.2 This test met
7、hod can be used to develop production andpurchasing specifications.4.Apparatus4.1 Buret,2 mL in 0.01 mL subdivisions,self-leveling,with1000 mL reservoir.4.2 Vinyl Tubing.24.3 Two Indicating Carbon Dioxide Absorbent Tubes,3050mesh.5.Reagents5.1 Purity of ReagentsReagent grade chemicals shall beused i
8、n all tests.Unless otherwise indicated,it is intended thatall reagents shall conform to the specifications of the Commit-tee on Analytical Reagents of the American Chemical Society,where such specifications are available.3Other grades may beused,provided it is first ascertained that the reagent is o
9、fsufficiently high purity to permit its use without lessening theaccuracy of the determination.5.2 Purity of WaterUnless otherwise indicated,referencesto water shall be understood to mean halide-free distilled water.5.3 Isopropyl Alcohol.5.4 Phenolphthalein Indicator Solution(0.05 g in 100 mLofisopr
10、opyl alcohol).5.5 Potassium Acid Phthalate,U.S.National Bureau ofStandards primary standard.Dry this chemical in a 120 Coven for several hours prior to use.Store the dry chemical in adesiccator.5.6 Potassium Hydroxide Pellets.5.7 Potassium Hydroxide Solution in Isopropyl Alcohol(0.01 N)Add approxima
11、tely 1 g of solid KOH to approxi-mately 1 L of anhydrous isopropyl alcohol in a 2 L Erlenmeyerflask.Boil the mixture gently for 5 to 10 min,stirring toprevent the solids from forming a cake on the bottom.Add atleast 2 g of barium hydroxide Ba(OH)2 and boil again gentlyfor 5 to 10 min.Cool to room te
12、mperature.Allow to stand forseveral hours and filter the supernatant liquid through a finesintered glass or porcelain filtering funnel.Avoid unnecessaryexposure to CO2during filtration.Store the solution out ofcontact with cork or rubber.Protect the solution from CO2by1This test method is under the
13、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 Jan.1,2020.Published January 2020.Originallyapproved in 1975.Last previous edition approved in 2015 as D3444
14、00(2015).DOI:10.1520/D344400R20.2Tygon has been found satisfactory.An equivalent may be used.3Reagent Chemicals,American Chemical Society Specifications,AmericanChemical Society,Washington,DC.For suggestions on the testing of reagents notlisted by the American Chemical Society,see Analar Standards f
15、or LaboratoryChemicals,BDH Ltd.,Poole,Dorset,U.K.,and the United States Pharmacopeiaand National Formulary,U.S.Pharmacopeial Convention,Inc.(USPC),Rockville,MD.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was
16、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.a guard tube containing carbon dioxide adsorbent.Standardizeagainst pure potassium acid phthalate in about 25 mL ofCO2-free water using phenolphthalein to detect the end point.6.Hazards6.1 Trichlorotrifluoroethane remo
