ASTM D3742-98

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn. Contact
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Designation: D 3742 – 98
AMERICAN SOCIETY FOR TESTING AND MATERIALS
100 Barr Harbor Dr., West Conshohocken, PA 19428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
Standard Test Method for
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1,1,1-Trichloroethane Content
This standard is issued under the fixed designation D 3742; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
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e NOTE—Section 10, Keywords, was added in June 1994.
1. Scope 5.3.1 Column—Annealed copper or stainless steel tubing,
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20 ft by ⁄8 in. (2.4 m by 3.2 mm) in outside diameter.
1.1 This test method provides a basis for the determination
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5.3.2 Packing—Chromosorb W HP, 80/100 mesh coated
of the 1,1,1-trichloroethane (weight %) in the presence of
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with 20 weight % OV101 (or equivalent, polydimethyl
stabilizers and impurities, in virgin or reclaimed 1,1,1-
siloxane) as the liquid phase.
trichloroethane products.
5.3.3 Or other columns or packings capable of providing
2. Referenced Documents
separation of 1,1,1-trichloroethane from stabilizers and process
impurities.
2.1 ASTM Standards:
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5.4 Carrier Gas—Dry helium of 99.95 mol % purity.
E 260 Practice for Packed Column Gas Chromatography
5.5 Standard—Uninhibited 1,1,1-trichloroethane of known
3. Summary of Test Method
high purity of at least 98.0 %.
5.6 Flow Meter—Capable of measuring in the prescribed
3.1 Gas chromatographic scans of 1,1,1-trichloroethane of
gas flow ranges.
known purity and the sample under test are prepared. The
1,1,1-trichloroethane concentration of the unknown is calcu-
6. Suggested Analysis Conditions
lated by comparison of the respective elution peak areas.
6.1 The following analysis conditions are recommended:
4. Significance and Use
Initial Column temperature 85°C
Initial hold time 4 min
4.1 This test method provides an analysis in weight percent
Rate 8°C/min
of the 1,1,1-trichloroethane concentration of virgin, or re-
Final temperature 160°C
Final hold time 16 min
claimed 1,1,1-trichloroethane. Compounds that co-elute with
Detector temperature 250°C
1,1,1-trichloroethane may interfere with this test.
Injector temperature 250°C
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Carrier gas and flow 20 He/20 cm /min
5. Apparatus
Sample size 2 μL
5.1 Gas Chromatograph having the following minimum
NOTE 1—With a hydrogen flame detector, sample size should be
capabilities:
reduced to around 0.2 μL to prevent overloading the detector.
5.1.1 Temperature programmable column over with control
6.1.1 Employing the conditions recommended, all constitu-
systems capable of maintaining the chromatographic column at
ents of 1,1,1-trichloroethane solvents should elute from the
the prescribed temp
...