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1.1 This practice covers a weighted average effective SO2 level for a 30-day interval through the use of the sulfation plate method, a technique for estimating the effective SO2 content of the atmosphere, and especially with regard to the atmospheric corrosion of stationary structures or panels. This practice is aimed at determining SO2 levels rather than sulfuric acid aerosol or acid precipitation.
1.2 The results of this practice correlate approximately with volumetric SO2 concentrations, although the presence of dew or condensed moisture tends to enhance the capture of SO2 into the plate.
1.3 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.
D516 Test Method for Sulfate Ion in Water
D1193 Specification for Reagent Water
D2010/D2010M Test Methods for Evaluation of Total Sulfation Activity in the Atmosphere by the Lead Dioxide Technique
G16 Guide for Applying Statistics to Analysis of Corrosion Data
G84 Practice for Measurement of Time-of-Wetness on Surfaces Exposed to Wetting Conditions as in Atmospheric Corrosion Testing
G140 Test Method for Determining Atmospheric Chloride Deposition Rate by Wet Candle Method
ISO StandardsISO 9225 Corrosion of metals and alloys- Corrosivity of atmospheres - Measurement of environmental parameters affecting corrosivity of atmospheres
ICS Number Code 13.040.20 (Ambient atmospheres)
UNSPSC Code 41114604(Corrosion testers)
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ASTM G91-97(2010), Standard Practice for Monitoring Atmospheric SO