ASTM D2914-2001(2007) Standard Test Methods for Sulfur Dioxide Content of the Atmosphere (West-Gaeke Method)《大气中二氧化硫含量的标准试验方法(韦斯特-盖克法)》.pdf
《ASTM D2914-2001(2007) Standard Test Methods for Sulfur Dioxide Content of the Atmosphere (West-Gaeke Method)《大气中二氧化硫含量的标准试验方法(韦斯特-盖克法)》.pdf》由会员分享,可在线阅读,更多相关《ASTM D2914-2001(2007) Standard Test Methods for Sulfur Dioxide Content of the Atmosphere (West-Gaeke Method)《大气中二氧化硫含量的标准试验方法(韦斯特-盖克法)》.pdf(14页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: D 2914 01 (Reapproved 2007)Standard Test Methods forSulfur Dioxide Content of the Atmosphere (West-GaekeMethod)1This standard is issued under the fixed designation D 2914; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision
2、, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1. Scope1.1 These test methods cov
3、er the bubbler collection andcolorimetric determination of sulfur dioxide (SO2)intheambient or workplace atmosphere.1.2 These test methods are applicable for determining SO2over the range from approximately 25 g/m3(0.01 ppm(v) to1000 g/m3(0.4 ppm(v), corresponding to a solution concen-tration of 0.0
4、3 gSO2/mL to 1.3 gSO2/mL. Beers law isfollowed through the working analytical range from 0.02 gSO2/mL to 1.4 gSO2/mL.1.3 The lower limit of detection is 0.075 gSO2/mL (1)2,representing an air concentration of 25 gSO2/m3(0.01ppm(v) in a 30min sample, or 13 gSO2/m3(0.005 ppm(v)in a 24h sample.1.4 Thes
5、e test methods incorporate sampling for periodsbetween 30 min and 24 h.1.5 These test methods describe the determination of thecollected (impinged) samples.AMethodAand a Method B aredescribed.1.6 Method A is preferred over Method B, as it gives thehigher sensitivity, but it has a higher blank. Manua
6、l Method Bis pH-dependent, but is more suitable with spectrometershaving a spectral band width greater than 20 nm.NOTE 1These test methods are applicable at concentrations below 25g/m3by sampling larger volumes of air if the absorption efficiency of theparticular system is first determined, as descr
7、ibed in Annex A4.NOTE 2Concentrations higher than 1000 g/m3can be determined byusing smaller gas volumes, larger collection volumes, or by suitabledilution of the collected sample with absorbing solution prior to analysis.1.7 This standard does not purport to address all of thesafety concerns, if an
8、y, associated with its use. It is theresponsibility 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. For specificprecautionary statements, see 8.3.1, Section 9, and A3.1.1.2. Referenced Documen
9、ts2.1 ASTM Standards:3D 1071 Test Methods for Volumetric Measurement of Gas-eous Fuel SamplesD 1193 Specification for Reagent WaterD 1356 Terminology Relating to Sampling and Analysis ofAtmospheresD 1357 Practice for Planning the Sampling of the AmbientAtmosphereD 1605 Practices for SamplingAtmosphe
10、res forAnalysis ofGases and Vapors4D 1914 Practice for Conversion Units and Factors Relatingto Sampling and Analysis of AtmospheresD 3195 Practice for Rotameter CalibrationD 3609 Practice for Calibration Techniques Using Perme-ation TubesD 3631 Test Methods for Measuring Surface AtmosphericPressureE
11、1 Specification for ASTM Liquid-in-Glass ThermometersE 275 Practice for Describing and Measuring Performanceof Ultraviolet, Visible, and Near-Infrared Spectrophotom-eters2.2 Other Standards:40 CFR Part 58 Probe and Monitoring Path Siting Criteriafrom Ambient Air Quality Monitoring, Appendix E53. Ter
12、minology3.1 For definitions of terms used in this method, refer toTerminology D 1356.1These test methods are under the jurisdiction of ASTM Committee D22 on AirQuality and are the direct responsibility of Subcommittee D22.03 on AmbientAtmospheres and Source Emissions.Current edition approved April 1
13、, 2007. Published June 2007. Originallyapproved in 1970. Last previous edition approved in 2001 as D 2914 - 01.2The boldface numbers in parentheses refer to a list of references at the end ofthis standard.3For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer S
14、ervice at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.4Withdrawn.5Available from U.S Government Printing Office, Superintendent of Documents,732 North Capitol Street, NW, Mail Stop: SDE, Washington, DC 20401.1C
15、opyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.4. Summary of Test Methods4.1 Sulfur dioxide (SO2) is absorbed by aspirating a mea-sured air sample through a tetrachloromercurate (TCM) solu-tion, resulting in the formation of a dichlor
16、osulfonatomercuratecomplex (2,3). Ethylenediaminetetraacetic acid disodium salt(EDTA) is added to this solution to complex heavy metals thatinterfere with this method (4). Dichlorosulfonatomercurate,once formed, is stable to strong oxidants (for example, ozoneand oxides of nitrogen) (2). After the a
17、bsorption is completed,any ozone in the solution is allowed to decay (5). The liquid istreated first with a solution of sulfamic acid to destroy thenitrite anion formed from the absorption of oxides of nitrogenpresent in the atmosphere (6). It is treated next with solutionsof formaldehyde and specia
18、lly purified acid-bleached pararo-saniline containing phosphoric acid (H3PO4) to control pH.Pararosaniline, formaldehyde, and the bisulfite anion react toform the intensely colored pararosaniline methyl sulfonic acidwhich behaves as a two-color pH indicator (2). The pH of thefinal solution is adjust
19、ed to the desired value by the addition ofprescribed amounts of 3 N H3PO4to the pararosaniline reagent(5).5. Significance and Use5.1 Sulfur dioxide is a major air pollutant, commonlyformed by the combustion of sulfur-bearing fuels. The Envi-ronmental Protection Agency (EPA) has set primary andsecond
20、ary air quality standards (7) that are designed to protectthe public health and welfare.5.2 The Occupational Safety and Health Administration(OSHA) has promulgated exposure limits for sulfur dioxide inworkplace atmospheres (8).5.3 These methods have been found satisfactory for mea-suring sulfur diox
21、ide in ambient and workplace atmospheresover the ranges pertinent in 5.1 and 5.2.5.4 Method A has been designed to correspond to theEPA-Designated Reference Method (7) for the determinationof sulfur dioxide.6. Interferences6.1 The interferences of oxides of nitrogen are eliminatedby sulfamic acid (5
22、,6), of ozone by time delay (5), and of heavymetals by EDTA and phosphoric acid (4,5). At least 60 gofFe(III), 10 g of Mn(II), and 10 g of Cr(III), 10 g of Cu(II)and 22 g of V(V) in 10 mL of absorbing reagent can betolerated in the procedure. No significant interference wasfound with 2.3 gofNH3(9).7
23、. Apparatus7.1 For Sampling:7.1.1 Absorber, ShortTerm SamplingAn all-glass midgetimpinger having a solution capacity of 30 mL and a stemclearance of 4 6 1 mm from the bottom of the vessel is usedfor sampling periods of 30 min and 1 h (or any periodconsiderably less than 24 h).7.1.2 Absorber, 24-h Sa
24、mplingA glass or polypropylenetube 32 mm in diameter and 164 mm long with a polypropy-lene two-port cap (rubber stoppers are unacceptable becausethe absorbing reagent can react with the stopper to yielderroneously high SO2concentrations, and cause high andvariable blank values). Insert a glass impin
- 1.请仔细阅读文档,确保文档完整性,对于不预览、不比对内容而直接下载带来的问题本站不予受理。
- 2.下载的文档,不会出现我们的网址水印。
- 3、该文档所得收入(下载+内容+预览)归上传者、原创作者;如果您是本文档原作者,请点此认领!既往收益都归您。
下载文档到电脑,查找使用更方便
10000 积分 0人已下载
下载 | 加入VIP,交流精品资源 |
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- ASTMD291420012007STANDARDTESTMETHODSFORSULFURDIOXIDECONTENTOFTHEATMOSPHEREWESTGAEKEMETHOD 大气 二氧化硫 含量

链接地址:http://www.mydoc123.com/p-513782.html