Standard Test Method for Nitrogen Oxides (Combined) Content in the Atmosphere by the Griess-Saltzman Reaction

SIGNIFICANCE AND USE
Both NO2 and NO play an important role in photochemical-smog-forming reactions. In sufficient concentrations NO2 is deleterious to health, agriculture, materials, and visibility.
In combustion processes, significant amounts of NO may be produced by combination of atmospheric nitrogen and oxygen; at ambient temperatures, NO can be converted to NO2 by oxygen and other atmospheric oxidants. Nitrogen dioxide also may be generated from processes involving nitric acid, nitrates, the use of explosives, and welding.
SCOPE
1.1 This test method covers the manual determination of the combined nitrogen dioxide (NO2) and nitric oxide (NO) content, total NOx; in the atmosphere in the range from 4 to 10 000 g/m3 (0.002 to 5 ppm (v)).
1.2 The maximum sampling period is 60 min at a flow rate of 0.4 L/min.
1.3 The values stated in SI units are to be regarded as standard. The values given in brackets are for information only.
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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Publication Date
30-Sep-2005
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ASTM D3608-95(2005) - Standard Test Method for Nitrogen Oxides (Combined) Content in the Atmosphere by the Griess-Saltzman Reaction
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:D3608–95(Reapproved2005)
Standard Test Method for
Nitrogen Oxides (Combined) Content in the Atmosphere by
1
the Griess-Saltzman Reaction
This standard is issued under the fixed designation D3608; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope E128 Test Method for Maximum Pore Diameter and Per-
meability of Rigid Porous Filters for Laboratory Use
1.1 This test method covers the manual determination of the
combined nitrogen dioxide (NO ) and nitric oxide (NO)
2
3. Terminology
content, total NO ; in the atmosphere in the range from 4 to
x
3 3.1 Definitions—For definitions of terms used in this test
10 000 µg/m (0.002 to 5 ppm (v)).
method, refer to Terminology D1356.
1.2 The maximum sampling period is 60 min at a flow rate
of 0.4 L/min.
4. Summary of Test Method
1.3 The values stated in SI units are to be regarded as
3
4.1 The NO is quantitatively (1) converted to NO by a
2
standard.Thevaluesgiveninbracketsareforinformationonly.
chromicacidoxidizer.TheresultingNO ,plustheNO already
2 2
1.4 This standard does not purport to address all of the
present, are absorbed in an azo-dye-forming reagent (2). A
safety concerns, if any, associated with its use. It is the
red-violet color is produced within 15 min, the intensity of
responsibility of the user of this standard to establish appro-
which is measured spectrophotometrically at 550 nm.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
5. Significance and Use
5.1 Both NO and NO play an important role in
2. Referenced Documents
2
2 photochemical-smog-forming reactions. In sufficient concen-
2.1 ASTM Standards:
trations NO is deleterious to health, agriculture, materials, and
2
D1071 Test Methods for Volumetric Measurement of Gas-
visibility.
eous Fuel Samples
5.2 In combustion processes, significant amounts of NO
D1193 Specification for Reagent Water
may be produced by combination of atmospheric nitrogen and
D1356 Terminology Relating to Sampling and Analysis of
oxygen; at ambient temperatures, NO can be converted to NO
2
Atmospheres
by oxygen and other atmospheric oxidants. Nitrogen dioxide
D1357 Practice for Planning the Sampling of the Ambient
also may be generated from processes involving nitric acid,
Atmosphere
nitrates, the use of explosives, and welding.
D3195 Practice for Rotameter Calibration
D3609 Practice for Calibration Techniques Using Perme-
6. Interferences
ation Tubes
6.1 Anysignificantinterferencesduetosulfurdioxide(SO )
2
D3631 Test Methods for Measuring Surface Atmospheric
should be negated by the oxidation step. The addition of
Pressure
acetone to the reagent retards color-fading by forming a
E1 Specification for ASTM Liquid-in-Glass Thermometers
temporary addition product with SO . This will protect the
2
reagent from incidental exposure to SO and will permit
2
1
This test method is under the jurisdiction of ASTM Committee D22 on Air
readingthecolorintensitywithin4to5h(insteadofthe45min
Quality and is the direct responsibility of Subcommittee D22.03 on Ambient
required without acetone) without appreciable losses.
Atmospheres and Source Emissions.
6.2 A five-fold ratio of ozone to NO will cause a small
2
Current edition approved Oct. 1, 2005. Published January 2006. Originally
´1
approved in 1977. Last previous edition approved in 2000 as D3608 - 95 (2000) . interference, the maximal effect occurring in 3 h. The reagent
DOI: 10.1520/D3608-95R05.
assumes a slightly orange tint.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
3
Standards volume information, refer to the standard’s Document Summary page on The boldface numbers in parentheses refer to the list of references appended to
the ASTM website. this test method.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D3608–95 (2005)
6.3 The interferences from nitrous oxide and nitrogen pen- acid mixture, rinse well with water, and redetermine the
toxide, and other gases that might be found in polluted air are maximum pore diameter.
considered to be negligible. 7.3.3 Rinse the bubbler thoroughly with water and allow to
dry before using.
7.4 Mist Eliminator or Gas Drying Tube filled with acti-
vated charcoal or soda lime is used to prevent damage to the
flowmeter and pump.
7.5 Air-Metering Device—A calibrated glass variable-area
flowmeter, or dry gas meter coupled with a flow indicator
capableofaccur
...

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