ASTM D1608-98

NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
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Designation: D 1608 – 98
Standard Test Method for
Oxides of Nitrogen in Gaseous Combustion Products
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(Phenol-Disulfonic Acid Procedures)
This standard is issued under the fixed designation D 1608; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope D 1605 Practices for Sampling Atmospheres for Analysis of
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Gases and Vapors
1.1 This test method describes the phenol-disulfonic acid
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colorimetric procedure (1) for the determination of total
3. Terminology
oxides of nitrogen [nitrous oxide (N O) excepted] in gaseous
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3.1 Definitions—For definitions of terms used in this test
effluents from combustion and other nitrogen oxidation pro-
method, refer to Terminology D 1356.
cesses.
1.2 It is applicable to a concentration range of oxides of
4. Summary of Test Method
nitrogen as nitrogen dioxide (NO ) of 5 ppm to several
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4.1 The gas sample is admitted into an evacuated flask
thousand parts per million by volume (four to several thousand
containing an oxidizing absorbing solution consisting of hy-
milligrams per dry standard cubic metre).
drogen peroxide in dilute sulfuric acid. The oxides of nitrogen
1.3 Since the grab sampling technique used takes a rela-
are converted to nitric acid by gas phase oxidation due to
tively small sample over a very short period of time, the result
oxygen in the sample and by the absorbent solution. The
obtained will be an instantaneous measure of the nitrogen
resulting nitrate ion is reacted with phenol disulfonic acid to
oxides and, therefore, will be representative of the emissions
produce a yellow compound (the tri-ammonium salt of 6-nitro-
only if the gas stream is well mixed and the concentration
1-phenol-2,4-disulfonic acid), which is measured colorimetri-
constant with time. Multiple samples are recommended.
cally. Calibration curves, prepared from samples of known
1.4 The values stated in SI units are to be regarded as
nitrate content, are used to determine the amount of nitrate in
standard. The SI equivalents are in parentheses and may be
the sample with results expressed as nitrogen dioxide.
approximate.
1.5 This standard does not purport to address all of the
5. Significance and Use
safety concerns, if any, associated with its use. It is the
5.1 This test method provides a means to measure the total
responsibility of the user of this standard to establish appro-
nitrogen oxides (NO ) content of gaseous emissions for pur-
x
priate safety and health practices and determine the applica-
poses such as determining compliance with regulations, study-
bility of regulatory limitations prior to use. (For more specific
ing the effect of various abatement procedures on NO emis-
x
safety precautionary information see 8.5 and Section 3.)
sions, and checking the validity of instrumental measurements.
2. Referenced Documents
6. Interferences (1, 2)
2.1 ASTM Standards:
6.1 Inorganic nitrates, nitrites, or organic nitrogen com-
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D 1193 Specification for Reagent Water
pounds that are easily oxidized to nitrates interfere with the test
D 1356 Terminology Relating to Sampling and Analysis of
method and give erroneously high results. The presence of
4
Atmospheres
certain reducing agents, for example, sulfur dioxide (SO ),
2
D 1357 Practice for Planning the Sampling of the Ambient
may interfere by consuming part of the hydrogen peroxide in
4
Atmosphere
the absorbing solution to leave an inadequate amount for
reaction with the oxides of nitrogen. Halides lower the results,
1 but interference from halide ion (and lead) are negligible in the
This test method is under the jurisdiction of ASTM Committee D-22 on
Sampling and Analysis of Atmospheres and is the direct responsibility of Subcom- concentration usually encountered in combustion sources.
mittee D22.03 on Ambient Atmospheres and Source Emissions.
6.2 The role of some of the constituents of combustion
Current edition approved Oct. 10, 1998. Published December 1998. Originally
effluents as possible interfering substances has not been thor-
e1
published as D 1608 – 58 T. Last previous edition D 1608 – 77 (1994) .
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oughly investigated.
The boldface numbers in parentheses refer to a list of references at the end of
this test method.
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Annual Book of ASTM Standards, Vol 11.01.
4 5
Annual Book of ASTM Standards, Vol 11.03. Discontinued—see 1991 Annual Book of ASTM Standards, Vol 11.03.
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