Significance and Use

Both NO ₂ and NO play an important role in photochemical-smog-forming reactions. In sufficient concentrations NO ₂ 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 NO ₂ by oxygen and other atmospheric oxidants. Nitrogen dioxide also may be generated from processes involving nitric acid, nitrates, the use of explosives, and welding.

1. Scope

1.1 This test method covers the manual determination of the combined nitrogen dioxide (NO ₂ ) and nitric oxide (NO) content, total NO _x ; in the atmosphere in the range from 4 to 10 000 ? g/m ³ (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 parentheses are for information only.

1.4 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.

2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM Standards

D1071 Test Methods for Volumetric Measurement of Gaseous Fuel Samples

D1193 Specification for Reagent Water

D1356 Terminology Relating to Sampling and Analysis of Atmospheres

D1357 Practice for Planning the Sampling of the Ambient Atmosphere

D3195 Practice for Rotameter Calibration

D3609 Practice for Calibration Techniques Using Permeation Tubes

D3631 Test Methods for Measuring Surface Atmospheric Pressure

E1 Specification for ASTM Liquid-in-Glass Thermometers

E128 Test Method for Maximum Pore Diameter and Permeability of Rigid Porous Filters for Laboratory Use

Keywords

ambient atmospheres; analysis; colorimetric analysis; Greiss-Saltzman reaction; nitric oxide; nitrogen dioxide; nitrogen oxides; sampling: Atmospheric analysis; Griess-Saltzman reaction; Nitrogen oxides;

ICS Code

ICS Number Code 13.040.20 (Ambient atmospheres)

DOI: 10.1520/D3608-95R11

ASTM International is a member of CrossRef.

ASTM D3608