ASTM D1946-90(2000)
(Practice)Standard Practice for Analysis of Reformed Gas by Gas Chromatography
Standard Practice for Analysis of Reformed Gas by Gas Chromatography
SCOPE
1.1 This practice covers the determination of the chemical composition of reformed gases and similar gaseous mixtures containing the following components: hydrogen, oxygen, nitrogen, carbon monoxide, carbon dioxide, methane, ethane, and ethylene.
1.2 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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Designation:D1946–90(Reapproved 2000)
Standard Practice for
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Analysis of Reformed Gas by Gas Chromatography
This standard is issued under the fixed designation D 1946; 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.
1. Scope 5. Apparatus
1.1 This practice covers the determination of the chemical 5.1 Detector—The detector shall be a thermal conductivity
composition of reformed gases and similar gaseous mixtures type or its equivalent in stability and sensitivity. The thermal
containing the following components: hydrogen, oxygen, ni- conductivity detector must be sufficiently sensitive to produce
trogen, carbon monoxide, carbon dioxide, methane, ethane, a signal of at least 0.5 mV for 1 mol % methane in a 0.5-mL
and ethylene. sample.
1.2 This standard does not purport to address all of the 5.2 Recording Instruments—Either strip chart recorders or
safety concerns, if any, associated with its use. It is the electronic integrators, or both, are used to display the separated
responsibility of the user of this standard to establish appro- components. Although a strip chart recorder is not required
priate safety and health practices and determine the applica- when using electronic integration, it is highly desirable for
bility of regulatory limitations prior to use. evaluation of instrument performance.
5.2.1 Therecorder,whenused,shallbeastripchartrecorder
2. Referenced Documents
with a full-range scale of 5 mV or less (1 mV preferred). The
2.1 ASTM Standards: width of the chart shall be not less than 150 mm. A maximum
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E 260 Practice for Packed Column Gas Chromatography
pen response time of2s(1s preferred) and a minimum chart
speed of 10 mm/min shall be required. Faster speeds up to 100
3. Summary of Practice
mm/min are desirable if the chromatogram is to be interpreted
3.1 Components in a sample of reformed gas are physically
using manual methods to obtain areas.
separatedbygaschromatographyandcomparedtocorrespond-
5.2.2 Electronic or Computing Integrators—Proof of sepa-
ing components of a reference standard separated under
ration and response equivalent to that for the recorder is
identical operating conditions, using a reference standard
required for displays other than by chart recorder.
mixture of known composition. The composition of the re-
5.3 Attenuator—If manual methods are used to interpret the
formed gas is calculated by comparison of either the peak
chromatogram, an attenuator must be used with the detector
height or area response of each component with the corre-
output signal to keep the peak maxima within the range of the
sponding value of that component in the reference standard.
recorder chart.The attenuator must be accurate to within 0.5 %
between the attenuator range steps.
4. Significance and Use
5.4 Sample Inlet System:
4.1 The information about the chemical composition can be
5.4.1 The sample inlet system must be constructed of
used to calculate physical properties of the gas, such as heating
materials that are inert and nonadsorptive with respect to the
(calorific) value and relative density. Combustion characteris-
components in the sample. The preferred material of construc-
tics, products of combustion, toxicity, and interchangeability
tion is stainless steel. Copper and copper-bearing alloys are
with other fuel gases may also be inferred from the chemical
unacceptable.
composition.
5.4.2 Provision must be made to introduce into the carrier
gas ahead of the analyzing column a gas-phase sample that has
beenentrappedineitherafixedvolumelooportubularsection.
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This practice is under the jurisdiction of ASTM Committee D-3 on Gaseous
The injected volume must be reproducible such that successive
Fuels and is the direct responsibility of Subcommittee D03.07 on Analysis of
runs of the same sample agree within the limits of repeatability
Chemical Composition of Gaseous Fuels.
Current edition approved March 30, 1990. Published May 1990. Originally
for the concentration range as specified in 11.1.1.
published as 1946 – 62 T. Last previous edition D 1946 – 82.
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Annual Book of ASTM Standards, Vol 14.02.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D1946–90 (2000)
5.4.3 If the instrument is calibrated with pure components, 5.8.2 Either an adsorption-type column or a partition-type
the inlet system shall be equipped to introduce a sample at less column, or both, may be used to make the analysis.
than atmospheric pressure. The pressure-sensing device must
NOTE 1—Se
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