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Significance and Use
Sulfur dioxide is a major air pollutant, commonly formed by the combustion of sulfur-bearing fuels. The Environmental Protection Agency (EPA) has set primary and secondary air quality standards (7) that are designed to protect the public health and welfare.
The Occupational Safety and Health Administration (OSHA) has promulgated exposure limits for sulfur dioxide in workplace atmospheres (8).
Method A has been designed to correspond to the EPA-Designated Reference Method (7) for the determination of sulfur dioxide.
1.1 These test methods cover the bubbler collection and colorimetric determination of sulfur dioxide (SO
1.2 These test methods are applicable for determining SO
1.3 The lower limit of detection is 0.075 g SO
1.4 These test methods incorporate sampling for periods between 30 min and 24 h.
1.5 These test methods describe the determination of the collected (impinged) samples. A Method A and a Method B are described.
1.6 Method A is preferred over Method B, as it gives the higher sensitivity, but it has a higher blank. Manual Method B is pH-dependent, but is more suitable with spectrometers having a spectral band width greater than 20 nm. Note 1These test methods are applicable at concentrations below 25 g/m 3 by sampling larger volumes of air if the absorption efficiency of the particular system is first determined, as described in Annex A4.<>Note 2
Concentrations higher than 1000 g/m 3 can be determined by using smaller gas volumes, larger collection volumes, or by suitable dilution of the collected sample with absorbing solution prior to analysis.
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.
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
D1605 Practices for Sampling Atmospheres for Analysis of Gases and Vapors
D1914 Practice for Conversion Units and Factors Relating to Sampling and Analysis of Atmospheres
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
E275 Practice for Describing and Measuring Performance of Ultraviolet and Visible Spectrophotometers
Other Standards40CFRPart58 Probe and Monitoring Path Siting Criteria from Ambient Air Quality Monitoring, Appendix E Available from U.S Government Printing Office, Superintendent of Documents, 732 North Capitol Street, NW, Mail Stop: SDE, Washington, DC 20401.
ICS Number Code 13.040.20 (Ambient atmospheres)
UNSPSC Code 77121501(Air quality management)