ASTM G91-1997(2004) Standard Practice for Monitoring Atmospheric SO2 Using the Sulfation Plate Technique《使用硫酸化极板技术检测大气中二氧化硫的标准实施规范》.pdf
《ASTM G91-1997(2004) Standard Practice for Monitoring Atmospheric SO2 Using the Sulfation Plate Technique《使用硫酸化极板技术检测大气中二氧化硫的标准实施规范》.pdf》由会员分享,可在线阅读,更多相关《ASTM G91-1997(2004) Standard Practice for Monitoring Atmospheric SO2 Using the Sulfation Plate Technique《使用硫酸化极板技术检测大气中二氧化硫的标准实施规范》.pdf(5页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: G 91 97 (Reapproved 2004)Standard Practice forMonitoring Atmospheric SO2Using the Sulfation PlateTechnique1This standard is issued under the fixed designation G 91; the number immediately following the designation indicates the year of originaladoption or, in the case of revision, the y
2、ear of last revision. A number in parentheses indicates the year of last reapproval. A superscriptepsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This practice covers a weighted average effective SO2level for a 30-day interval through the use of the sulfat
3、ion platemethod, a technique for estimating the effective SO2content ofthe atmosphere, and especially with regard to the atmosphericcorrosion of stationary structures or panels. This practice isaimed at determining SO2levels rather than sulfuric acidaerosol or acid precipitation.1.2 The results of t
4、his practice correlate approximately withvolumetric SO2concentrations, although the presence of dewor condensed moisture tends to enhance the capture of SO2intothe plate.1.3 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility
5、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.2. Referenced Documents2.1 ASTM Standards:2D 516 Test Methods for Sulfate Ion in WaterD 2010/D 2010M Test Method for Evaluation of TotalSulfation
6、 Activity in the Atmosphere by the Lead DioxideTechniqueG 16 Guide for Applying Statistics to Analysis of CorrosionData3. Summary of Practice3.1 Sulfation plates consisting of a lead peroxide reagent inan inverted dish are exposed for 30-day intervals. The platesare recovered and sulfate analyses pe
7、rformed on the contents todetermine the extent of sulfur capture. The results are reportedin terms of milligrams of SO2per square metre per day.4. Significance and Use4.1 Atmospheric corrosion of metallic materials is a func-tion of many weather and atmospheric variables. The effect ofspecific corro
8、dants, such as sulfur dioxide, can accelerate theatmospheric corrosion of metals significantly. The sulfationplate method provides a simple technique to independentlymonitor the level of SO2in the atmosphere to yield a weightedaverage result.4.2 Sulfation plate results may be used to characterizeatm
9、ospheric corrosion test sites regarding the effective averagelevel of SO2in the atmosphere at these locations.4.3 Sulfation plate testing is useful in determining micro-climate, seasonal, and long term variations in the effectiveaverage level of SO2.4.4 The results of sulfation plate tests may be us
10、ed incorrelations of atmospheric corrosion rates with atmosphericdata to determine the sensitivity of the corrosion rate to SO2level.4.5 The sulfation plate method may also be used with othermethods to characterize the atmosphere at sites where build-ings or other construction is planned in order to
11、 determine theextent of protective measures required for metallic materials.5. Interferences5.1 The lead peroxide reagent used in this practice mayconvert other compounds such as mercaptans, hydrogen sul-fide, and carbonyl sulfide into sulfate.NOTE 1Hydrogen sulfide and mercaptans, at concentrations
12、 whichaffect the corrosion of structural metals significantly, are relatively rare inmost atmospheric environments, but their effects regarding the corrosionof metals are not equivalent to sulfur dioxide. Therefore, if H2S, COS, ormercaptans are present in the atmosphere, the lead peroxide method mu
13、stnot be used to assess atmospheric corrosivity. It should also be noted thatno actual measurements have been made which would establish thecorrelation between atmospheric H2S, COS, or mercaptan level andsulfation as measured by this practice.1This practice is under the jurisdiction of ASTM Committe
14、e G01 on Corrosionof Metals and is the direct responsibility of Subcommittee G01.04 on AtmosphericCorrosion.Current edition approved Nov 1, 2004. Published November 2004. Originallyapproved in 1986. Last previous edition approved on 1997 as G 91 97.2For referenced ASTM standards, visit the ASTM webs
15、ite, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United Stat
16、es.5.2 The inverted exposure position of the sulfation plate isintended to minimize capture of sulfuric acid aerosols andsulfur bearing species from precipitation.6. Sulfation Plate Preparation and Exposure6.1 Sulfation plates can be prepared according to themethod of Huey.3The plate preparation met
17、hod is given inAppendix X1. Laboratory prepared plates should be exposedwithin 120 days of preparation.6.2 In general, the level of atmospheric sulfur dioxide variesseasonally during the year so that a minimal exposure programrequires four 30-day exposures each year at roughly equalintervals. In ord
18、er to establish the atmospheric SO2level at anatmospheric corrosion test site which has not been monitoredpreviously, a program in which six 30-day exposures per yearfor a period of 3 years is recommended. More extensive testingmay be desirable if large variability is encountered in theresults. Ther
19、eafter, the location should be monitored with atleast four tests in a 1-year period every 3 years. If thesubsequent tests are not consistent with the initial testing, thenanother 3-year program of six tests per year is required. Also,if a major change in the general area occurs in terms ofindustrial
20、 or urban development, then six tests per year for 3years should again be carried out.6.3 In monitoring exposure sites, a minimum of four platesshall be used for each exposure period.6.3.1 Sites which have a grade or elevation variation shouldbe monitored with at least two plates at the highest elev
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