1、Designation:D160791(Reapproved 2011)Standard Test Method forNitrogen Dioxide Content of the Atmosphere(Griess-Saltzman Reaction)1This standard is issued under the fixed designation D1607;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revisio
2、n,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope1.1 This test method2covers
3、the manual determination ofnitrogen dioxide(NO2)in the atmosphere in the range from 4to 10 000 g/m3(0.002 to 5 ppm(v)when sampling isconducted in fritted-tip bubblers.1.2 For concentrations of NO2in excess of 10 mg/m3(5ppm(v),as occur in industrial atmospheres,gas burner stacks,or automotive exhaust
4、,or for samples relatively high in sulfurdioxide content,other methods should be applied.See forexample Test Method D1608.1.3 The maximum sampling period is 60 min at a flow rateof 0.4 L/min.1.4 The values stated in SI units are to be regarded asstandard.The values given in parentheses are for infor
5、mationonly.1.5 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.See als
6、o 7.2.2 forother precautions.2.Referenced Documents2.1 ASTM Standards:3D1071 Test Methods for Volumetric Measurement of Gas-eous Fuel SamplesD1193 Specification for Reagent WaterD1356 Terminology Relating to Sampling and Analysis ofAtmospheresD1357 Practice for Planning the Sampling of the AmbientAt
7、mosphereD1608 Test Method for Oxides of Nitrogen in GaseousCombustion Products(Phenol-Disulfonic Acid Proce-dures)D3195 Practice for Rotameter CalibrationD3609 Practice for Calibration Techniques Using Perme-ation TubesD3631 Test Methods for Measuring Surface AtmosphericPressureE1 Specification for
8、ASTM Liquid-in-Glass ThermometersE128 Test Method for Maximum Pore Diameter and Perme-ability of Rigid Porous Filters for Laboratory Use3.Terminology3.1 For definitions of terms used in this test method,refer toTerminology D1356.4.Summary of Test Method4.1 The NO2is absorbed in an azo-dye-forming re
9、agent(1).4Ared-violet color is produced within 15 min,the intensityof which is measured spectrophotometrically at 550 nm.5.Significance and Use5.1 Nitrogen dioxide plays an important role in photochemi-cal smog-forming reactions and,in sufficient concentrations,isdeleterious to health,agriculture,ma
10、terials,and visibility.5.2 In combustion processes,significant amounts of nitricoxide(NO)may be produced by combination of atmosphericnitrogen and oxygen;at ambient temperatures NO can beconverted to NO2by oxygen and other atmospheric oxidants.Nitrogen dioxide may also be generated from processes in
11、volv-ing nitric acid,nitrates,the use of explosives,and welding.6.Interferences6.1 Aten-fold ratio of sulfur dioxide(SO2)to NO2producesno effect.A thirty-fold ratio slowly bleaches the color to a1This test method is under the jurisdiction of ASTM Committee D22 on AirQuality and is the direct respons
12、ibility of Subcommittee D22.03 on AmbientAtmospheres and Source Emissions.Current edition approved Oct.1,2011.Published October 2011.Originallyapproved in 1958.Last previous edition approved in 2005 as D1607 91(2005).DOI:10.1520/D1607-91R11.2Adapted from“Selected Methods for the Measurement of Air P
13、ollutants,”PHSPublication No 999-AP-11,May 1965.A similar version has been submitted to theIntersociety Committee.3For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the sta
14、ndards Document Summary page onthe ASTM website.4The boldface numbers in parentheses refer to the list of references appended tothis method.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 slight extent.The addition of acetone to the reage
15、nt retards thefading by forming a temporary addition product with SO2.Thispermits reading the color intensity within 4 to 5 h(instead ofthe 45 min required without the acetone)without appreciablelosses.6.2 A five-fold ratio of ozone to NO2will cause a smallinterference,the maximal effect occurring i
16、n 3 h.The reagentassumes a slightly orange tint.6.3 Peroxyacetyl nitrate(PAN)can produce a color changein the absorbing reagent.However,in ordinary ambient air,theconcentration of PAN is too low to cause any significant errorin the measurement of NO2.6.4 Interferences may exist from other nitrogen oxides andother gases that might be found in polluted air.7.Apparatus7.1 Sampling ProbeA glass or TFE-fluorocarbon(pre-ferred)tube,6 to 10 mm in diameter provided with adownwind facing intake(funnel or
