EPA Method 7E Determination Of Nitrogen Oxides Emissions From Stationary Sources (Instrumental Analyzer Procedure)
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ID： |
875FE0D4BB26461780811506A33807C6 |
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文件大小(MB)： |
0.16 |
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页数： |
36 |
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文件格式： |
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日期： |
2011-5-20 |
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购买： |
文本摘录（文本识别可能有误，但文件阅览显示及打印正常，pdf文件可进行文字搜索定位）：
(The following is an updated copy of Method 7E after the 5/22/08 and 5/29/09,technical corrections),Method 7E—Determination of Nitrogen Oxides Emissions From,Stationary Sources (Instrumental Analyzer Procedure),1.0 Scope and Application,What is Method 7E?,Method 7E is a procedure for measuring nitrogen oxides (NOX),in stationary source emissions using a continuous,instrumental analyzer. Quality assurance and quality,control requirements are included to assure that you, the,tester, collect data of known quality. You must document,your adherence to these specific requirements for,equipment, supplies, sample collection and analysis,calculations, and data analysis. This method does not,completely describe all equipment, supplies, and sampling,and analytical procedures you will need but refers to other,methods for some of the details. Therefore, to obtain,reliable results, you should also have a thorough knowledge,of these additional test methods which are found in,appendix A to this part:,(a) Method 1—Sample and Velocity Traverses for Stationary,Sources.,(b) Method 4—Determination of Moisture Content in Stack,Gases.,1.1 Analytes. What does this method determine? This method,measures the concentration of nitrogen oxides as NO2.,Analyte CAS No. Sensitivity,Nitric oxide (NO) 10102–43–9 Typically <2% of,Nitrogen dioxide (NO2) 10102–44–0 Calibration Span.,1.2 Applicability. When is this method required? The use,of Method 7E may be required by specific New Source,Performance Standards, Clean Air Marketing rules, State,Implementation Plans, and permits where measurement of NOX,concentrations in stationary source emissions is required,either to determine compliance with an applicable emissions,standard or to conduct performance testing of a continuous,monitoring system (CEMS). Other regulations may also,require the use of Method 7E.,1.3 Data Quality Objectives (DQO). How good must my,collected data be? Method 7E is designed to provide highquality,data for determining compliance with Federal and,State emission standards and for relative accuracy testing,of CEMS. In these and other applications, the principal,objective is to ensure the accuracy of the data at the,actual emission levels encountered. To meet this objective,the use of EPA traceability protocol calibration gases and,measurement system performance tests are required.,1.4 Data Quality Assessment for Low Emitters. Is,performance relief granted when testing low-emission units?,Yes. For low-emitting sources, there are alternative,performance specifications for analyzer calibration error,system bias, drift, and response time. Also, the,alternative dynamic spiking procedure in Section 16 may,provide performance relief for certain low-emitting units.,2.0 Summary of Method,In this method, a sample of the effluent gas is,continuously sampled and conveyed to the analyzer for,measuring the concentration of NOX. You may measure NO and,NO2separately or simultaneously together but, for the,purposes of this method, NOX is the sum of NO and NO2. You,must meet the performance requirements of this method to,validate your data.,3.0 Definitions,3.1 Analyzer Calibration Error , for non-dilution systems,means the difference between the manufacturer certified,concentration of a calibration gas and the measured,concentration of the same gas when it is introduced into,the analyzer in direct calibration mode.,3.2 Calibration Curve means the relationship between an,analyzer's response to the injection of a series of,calibration gases and the actual concentrations of those,gases.,3.3 Calibration Gas means the gas mixture containing NOXat,a known concentration and produced and certified in,accordance with “EPA Traceability Protocol for Assay and,Certification of Gaseous Calibration Standards,” September,1997, as amended August 25, 1999, EPA–600/R–97/121 or more,recent updates. The tests for analyzer calibration error,drift, and system bias require the use of calibration gas,prepared according to this protocol. If a zero gas is used,for the low-level gas, it must meet the requirements under,the definition for “zero air material” in 40 CFR 72.2 in,place of being prepared by the traceability protocol.,3.3.1 Low-Level Gas means a calibration gas with a,concentration that is less than 20 percent of the,calibration span and may be a zero gas.,3.3.2 Mid-Level Gas means a calibration gas with a,concentration that is 40 to 60 percent of the calibration,span.,3.3.3 High-Level Gas means a calibration gas with a,concentration that is equal to the calibration span.,3.4 Calibration Span means the upper limit of the,analyzer's calibration that is set by the choice of h……
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