ASTM D3448-1985(2005) Standard Test Method for Specific Aqueous Conductance of Trichlorotrifluoroethane《三氯三氟乙烷的特殊水质传导率的试验方法》.pdf
《ASTM D3448-1985(2005) Standard Test Method for Specific Aqueous Conductance of Trichlorotrifluoroethane《三氯三氟乙烷的特殊水质传导率的试验方法》.pdf》由会员分享,可在线阅读,更多相关《ASTM D3448-1985(2005) Standard Test Method for Specific Aqueous Conductance of Trichlorotrifluoroethane《三氯三氟乙烷的特殊水质传导率的试验方法》.pdf(4页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: D 3448 85 (Reapproved 2005)Standard Test Method forSpecific Aqueous Conductance of Trichlorotrifluoroethane1This standard is issued under the fixed designation D 3448; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, th
2、e 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 determination of aqueousconductivity due to ionizable contaminants extracted fr
3、omtrichlorotrifluoroethane. The value of 1.9 S/cm as maximumspecific aqueous conductance corresponds to 0.1 ppm ofchloride ion (100 ppb). It was calculated by putting the solventspecification of 0.1 ppm chloride into the equation of thesubject method to find C2 C1equals 19.08. The specificconductanc
4、e due to contaminants from the solvent was thencalculated as follows:C22 C1!C35 19! 0.1! 5 1.9 S/cm (1)1.2 The above is exclusive of the background specificconductance of the water used in the analysis.1.3 This standard does not purport to address all of thesafety concerns, if any, associated with i
5、ts use. It is theresponsibility of the user of this standard to consult andestablish appropriate safety and health practices and deter-mine the applicability of regulatory limitations prior to use.Specific precautionary statements are given in Section 6.2. Summary of Test Method2.1 Ionizable impurit
6、ies in the solvent are extracted withwater of known low conductivity. The increase in waterconductivity measures the amount of these impurities present.3. Significance and Use3.1 This test method allows for the determination of ioniz-able contaminants (expressed in terms of ppb of HCl) intrichlorotr
7、ifluoroethane via measurement of specific aqueousconductance.3.2 This test method can be used for establishing manufac-turing and purchasing specifications.4. Apparatus4.1 Conductivity Bridge.24.2 Conductivity Cell,3dip-type. Cell constant of 0.1 recip-rocal centimetre. Electrodes must be bright pla
8、tinum.4.3 Polyethylene Beaker,4250-mL.4.4 Polyethylene Bottles, wide mouth, 300-mL and 500-mLsize.4.4.1 Calibrate and mark the outside of the 300-mL poly-ethylene bottles to indicate 20, 120, and 220 mL (graduate) ofwater volume, using deionized water to determine the liquidlevels.4.5 Polyethylene T
9、ubing, long enough to reach the bottomof the 300-mL polyethylene bottle.5. Reagents5.1 Purity of ReagentsReagent grade chemicals shall beused in all tests. Unless otherwise indicated, it is intended thatall reagents shall conform to the specifications of the Commit-tee on Analytical Reagents of the
10、American Chemical Society,where such specifications are available.5Other grades may beused, provided it is first ascertained that the reagent is ofsufficiently high purity to permit its use without lessening theaccuracy of the determination.5.2 Alcoholic Hydrochloric Acid (0.01 N)Dilute 5.0 mL(pipet
11、) of concentrated hydrochloric acid to 6 L with denatured2B ethyl alcohol.5.3 Alumina Gel.65.4 Deionized Trichloromonofluoromethane, in 50-lb cylin-der. This deionized solvent may be selected pure material or itmay be purified by multiple passes through an alumina gelcontactor (see Fig. 1). Check th
12、e acceptability of this deionizedsolvent as described in 7.4.NOTE 1The use of deionized trichloromonofluoromethane will serveas a check on the cleanliness. The deionized standard should be used as1This test method is under the jurisdiction of ASTM Committee D26 onHalogenated Organic Solvents and Fir
13、e Extinguishing Agents and is the directresponsibility of Subcommittee D26.04 on Test Methods.Current edition approved June 1, 2005. Published June 2005. Originallyapproved in 1975. Last previous edition approved in 2000 as D 3448 85(00).2Serfass Model RCM-15B1 has been found satisfactory and can be
14、 obtainedfrom Industrial Instrument Inc., Cedar Grove, NJ. An equivalent may be used.3Model Cel-A01 has been found satisfactory and can be obtained from IndustrialInstrument Inc., Cedar Grove, NJ. An equivalent may be used.4Catalog No. H-4040, Harshaw Scientific Co., Cleveland, OH, has been foundsat
15、isfactory. An equivalent may be used.5Reagent 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 for LaboratoryChemicals, BDH Ltd., Poole, Dorset, U
16、.K., and the United States Pharmacopeiaand National Formulary, U.S. Pharmacopeial Convention, Inc. (USPC), Rockville,MD.6Grade F-3 has been found satisfactory and can be obtained from theAluminumCompany of America.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken,
17、PA 19428-2959, United States.required on a periodic basis when samples are being evaluated. Standardsshould be checked whenever high values are obtained or there is doubt ofthe results.5.5 Deionized WaterDistilled water passed through twomixed resin ion exchangers connected in series and having acon
18、ductance of no greater than 0.5 S. Check the acceptabilityof the deionized water in accordance with 7.3.5.6 Ethyl Alcohol.NOTE 2Specially denatured ethyl alcohol conforming to FormulaSD-2B of the U.S. Bureau of Internal Revenue may be substituted forethyl alcohol (95 %).5.7 Hydrochloric Acid, concen
19、trated.5.8 Ion-Exchange Cylinders.76. Safety Precautions6.1 Both trichlorotrifluoroethane and trichloromonofluoro-methane are not flammable and have threshold limit values of1000 ppm by volume in air. The respective boiling points ofthese solvents are about 118 and 75F (47.8 and 23.9C).Avoidrepeated
20、 skin contact with the solvents. They remove surfaceoils from skin.6.2 Denatured ethyl alcohol is flammable and has a thresh-old limit value of 1000 ppm by volume in air.6.3 Hydrochloric AcidTake all precautions necessary toavoid contact with the body internally and externally. The acidis corrosive.
21、7. Procedure7.1 The basis of this test method is the determination byconductance of ions present in the test solution. Therefore,clean all equipment carefully to remove all adsorbed ions in themeasuring apparatus, otherwise, erroneously high values willbe obtained. Do the initial cleaning and the cl
22、eaning ofequipment in accordance with 7.2. All equipment must berinsed with deionized trichloromonofluoromethane before us-ing in a test.7.2 Deionizing of Equipment:7.2.1 Polyethylene Bottles and Stainless Steel Cylinders:7.2.1.1 Add about 30 g of ion exchange resin from anexchange cylinder to the i
23、tem to be cleaned. Use an exchangecylinder as a source of resin for cleaning.7.2.1.2 Add deionized water to the container until it is abouttwo-thirds full.7.2.1.3 Close the container and roll for at least 24 h on a ballmill roller or its equivalent.7.2.1.4 Discard the ion-exchange resin and water, r
24、inse withdeionized water and then with deionized trichloromono-fluoromethane.7.2.2 Polyethylene Delivery Tubes:NOTE 3Use of highly plasticized polyethylene tubing and bottles isnot recommended.7.2.2.1 Place the polyethylene delivery tubes in a 500-mLpolyethylene bottle.7.2.2.2 Clean by following 7.2
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