ASTM D3448-10(2020)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D3448 −10 (Reapproved 2020)
Standard Test Method for
Specific Aqueous Conductance of Trichlorotrifluoroethane
This standard is issued under the fixed designation D3448; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 3. Significance and Use
1.1 This test method covers the determination of aqueous 3.1 This test method allows for the determination of ioniz-
conductivity due to ionizable contaminants extracted from able contaminants (expressed in terms of ppb of HCl) in
trichlorotrifluoroethane. The value of 1.9 µS/cm as maximum trichlorotrifluoroethane via measurement of specific aqueous
specific aqueous conductance corresponds to 0.1 ppm of conductance.
chlorideion(100ppb).Itwascalculatedbyputtingthesolvent
3.2 This test method can be used for establishing manufac-
specification of 0.1 ppm chloride into the equation of the
turing and purchasing specifications.
subject method to find C − C equals 19.08. The specific
2 1
conductance due to contaminants from the solvent was then 4. Apparatus
calculated as follows:
4.1 Conductivity Bridge.
~C 2 C !C 5 ~19!~0.1! 51.9 µS/cm (1) 3
2 1 3
4.2 Conductivity Cell, dip-type. Cell constant of 0.1 recip-
1.2 The above is exclusive of the background specific rocal centimetre. Electrodes must be bright platinum.
conductance of the water used in the analysis.
4.3 Polyethylene Beaker, 250 mL.
1.3 The values stated in SI units are to be regarded as
4.4 Polyethylene Bottles, wide mouth, 300 mLand 500 mL
standard. No other units of measurement are included in this
size.
standard.
4.4.1 Calibrate and mark the outside of the 300 mL poly-
1.3.1 Exception—Values are stated in inch-pound units in
ethylene bottles to indicate 20 mL, 120 mL, and 220 mL
Fig. 1.
(graduate) of water volume, using deionized water to deter-
1.4 This standard does not purport to address all of the
mine the liquid levels.
safety concerns, if any, associated with its use. It is the
4.5 Polyethylene Tubing, long enough to reach the bottom
responsibility of the user of this standard to consult and
of the 300 mL polyethylene bottle.
establish appropriate safety, health, and environmental prac-
tices and determine the applicability of regulatory limitations
5. Reagents
prior to use. Specific precautionary statements are given in
5.1 Purity of Reagents—Reagent grade chemicals shall be
Section 6.
used in all tests. Unless otherwise indicated, it is intended that
1.5 This international standard was developed in accor-
all reagents shall conform to the specifications of the Commit-
dance with internationally recognized principles on standard-
tee onAnalytical Reagents of theAmerican Chemical Society,
ization established in the Decision on Principles for the
where such specifications are available. Other grades may be
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
The sole source of supply of the apparatus (Serfass Model RCM-15B1) known
Barriers to Trade (TBT) Committee.
to the committee at this time is Industrial Instrument Inc., Cedar Grove, NJ. If you
are aware of alternative suppliers, please provide this information to ASTM
2. Summary of Test Method
International Headquarters. Your comments will receive careful consideration at a
meeting of the responsible technical committee, which you may attend.
2.1 Ionizable impurities in the solvent are extracted with
The sole source of supply of the apparatus (Model Cel-A01) known to the
water of known low conductivity. The increase in water
committee at this time is Industrial Instrument Inc., Cedar Grove, NJ. If you are
conductivity measures the amount of these impurities present.
aware of alternative suppliers, please provide this information to ASTM Interna-
tional Headquarters.Your comments will receive careful consideration at a meeting
of the responsible technical committee, which you may attend.
1 4
This test method is under the jurisdiction of ASTM Committee D26 on Reagent Chemicals, American Chemical Society Specifications, American
Halogenated Organic Solvents and Fire Extinguishing Agents and is the direct Chemical Society, Washington, DC. For suggestions on the testing of reagents not
responsibility of Subcommittee D26.04 on Test Methods. listed by the American Chemical Society, see Analar Standards for Laboratory
Current edition approved April 1, 2020. Published April 2020. Originally Chemicals, BDH Ltd., Poole, Dorset, U.K., and the United States Pharmacopeia
ɛ1
approved in 1975. Last previous edition approved in 2015 as D3448–10(2015) . and National Formulary, U.S. Pharmacopeial Convention, Inc. (USPC), Rockville,
DOI: 10.1520/D3448–10R20. MD.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D3448 − 10 (2020)
5.6 Ethyl Alcohol.
NOTE 2—Specially denatured ethyl alcohol conforming to Formula
SD-2B of the U.S. Bureau of Internal Revenue may be substituted for
ethyl alcohol (95%).
5.7 Hydrochloric Acid, concentrated.
5.8 Ion-Exchange Cylinders.
6. Safety Precautions
6.1 Both trichlorotrifluoroethane and trichloromonofluoro-
methane are not flammable and have threshold limit value’s of
1000 ppm by volume in air. The respective boiling points of
these solvents are 47.6°C and 23.7°C. Avoid repeated skin
contact with the solvents. They remove surface oils 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 Acid—Take all precautions necessary to
avoid contact with the body internally and externally.The acid
is corrosive.
7. Procedure
7.1 The basis of this test method is the determination by
conductance of ions present in the test solution. Therefore,
cleanallequipmentcarefullytoremovealladsorbedionsinthe
measuring apparatus, otherwise, erroneously high values will
be obtained. Do the initial cleaning and the cleaning of
equipment in accordance with 7.2. All equipment must be
rinsed with deionized trichloromonofluoromethane before us-
FIG. 1 Alumina Gel Contractor
ing in a test.
7.2 Deionizing of Equipment:
7.2.1 Polyethylene Bottles and Stainless Steel Cylinders:
used, provided it is first ascertained that the reagent is of
7.2.1.1 Add about 30 g of ion exchange resin from an
sufficiently high purity to permit its use without lessening the
exchange cylinder to the item to be cleaned. Use an exchange
accuracy of the determination.
cylinder as a source of resin for cleaning.
5.2 Alcoholic Hydrochloric Acid (0.01 N)—Dilute 5.0 mL
7.2.1.2 Adddeionizedwatertothecontaineruntilitisabout
(pipet)ofconcentratedhydrochloricacidto6Lwithdenatured
two-thirds full.
2B ethyl alcohol.
7.2.1.3 Closethecontainerandrollforatleast24honaball
5.3 Alumina Gel.
mill roller or its equivalent.
7.2.1.4 Discardtheion-exchangeresinandwater,rinsewith
5.4 Deionized Trichloromonofluoromethane, in 25 kg cylin-
deionized water and then with deionized trichloromono-
der. This deionized solvent may be selected pure material or it
fluoromethane.
may be purified by multiple passes through an alumina gel
7.2.2 Polyethylene Delivery Tubes:
contactor(seeFig.1).Checktheacceptabilityofthisdeionized
solvent as described in 7.4.
NOTE 3—Use of highly plasticized polyethylene tubing and bottles is
not recommended.
NOTE 1—The use of deionized trichloromonofluoromethane will serve
as a check on the cleanliness. The deionized standard should be used as
7.2.2.1 Place the polyethylene delivery tubes in a 500 mL
required on a periodic basis when samples are being evaluated. Standards
polyethylene bottle.
should be checked whenever high values are obtained or there is doubt of
7.2.2.2 Clean by following 7.2.1.1 – 7.2.1.4.
the results.
7.2.3 Polyethylene Beakers, Dip-Cell, and Other Equip-
5.5 Deionized Water—Distilled water passed through two
ment:
mixed resin ion exchangers connected in series and having a
7.2.3.1 Add about 30 g of ion-exchange resin to the beaker.
conductance of no greater than 0.5 µS. Check the acceptability
7.2.3.2 Fill the beaker with deionized water.
of the deionized water in accordance with 7.3.
The sole source of supply of the apparatus (Illco-Way ion exchange cylinders,
Thesolesourceofsupplyoftheapparatus(GradeF-3)knowntothecommittee researchmodel)knowntothecommitteeatthistimeisIllinoisWaterTreatmentCo.,
at this time is Aluminum Company of America. If you are aware of alternative Rockford, IL. If you are aware of alternative suppliers, please provide this
suppliers, please provide this in
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