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.
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