EPA Method 7 Determination Of Nitrogen Oxide Emissions From Stationary Sources
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ID： |
104D588563CA4E248DD8D83FA5541BE4 |
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文件大小(MB)： |
0.2 |
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页数： |
26 |
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文件格式： |
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日期： |
2000-2-12 |
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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）：
645,METHOD 7 - DETERMINATION OF NITROGEN OXIDE,EMISSIONS FROM STATIONARY SOURCES.,NOTE: This method does not include all of the,specifications (e.g., equipment and supplies) and procedures,(e.g., sampling and analytical) essential to its,performance. Some material is incorporated by reference,from other methods in this part. Therefore, to obtain,reliable results, persons using this method should have a,thorough knowledge of at least the following additional test,methods: Method 1 and Method 5.,1.0 Scope and Application.,1.1 Analytes.,Analyte CAS No. Sensitivity,Nitrogen oxides (NOx),as NO2, including:,Nitric oxide (NO),Nitrogen dioxide,(NO2),10102-43-9,10102-44-0,2-400 mg/dscm,1.2 Applicability. This method is applicable for the,measurement of nitrogen oxides (NOx) emitted from stationary,sources.,1.3 Data Quality Objectives. Adherence to the,requirements of this method will enhance the quality of the,data obtained from air pollutant sample methods.,2.0 Summary of Method.,646,A grab sample is collected in an evacuated flask,containing a dilute sulfuric acid-hydrogen peroxide,absorbing solution, and the nitrogen oxides, except nitrous,oxide, are measured colorimetrically using the,phenoldisulfonic acid (PDS) procedure.,3.0 Definitions. [Reserved],4.0 Interferences.,Biased results have been observed when sampling under,conditions of high sulfur dioxide concentrations (above 2000,ppm).,5.0 Safety.,5.1 Disclaimer. This method may involve hazardous,materials, operations, and equipment. This test method may,not address all of the safety problems associated with its,use. It is the responsibility of the user to establish,appropriate safety and health practices and to determine the,applicability of regulatory limitations prior to performing,this test method.,5.2 Corrosive Reagents. The following reagents are,hazardous. Personal protective equipment and safe,procedures are useful in preventing chemical splashes. If,contact occurs, immediately flush with copious amounts of,water for at least 15 minutes. Remove clothing under shower,647,and decontaminate. Treat residual chemical burns as thermal,burns.,5.2.1 Hydrogen Peroxide (H2O2). Irritating to eyes,skin, nose, and lungs.,5.2.2 Phenoldisulfonic Acid. Irritating to eyes and,skin.,5.2.3 Sodium Hydroxide (NaOH). Causes severe damage,to eyes and skin. Inhalation causes irritation to nose,throat, and lungs. Reacts exothermically with limited,amounts of water.,5.2.4 Sulfuric Acid (H2SO4). Rapidly destructive to,body tissue. Will cause third degree burns. Eye damage may,result in blindness. Inhalation may be fatal from spasm of,the larynx, usually within 30 minutes. May cause lung,tissue damage with edema. 1 mg/m3 for 8 hours will cause,lung damage or, in higher concentrations, death. Provide,ventilation to limit inhalation. Reacts violently with,metals and organics.,5.2.5 Phenol. Poisonous and caustic. Do not handle,with bare hands as it is absorbed through the skin.,6.0 Equipment and Supplies.,6.1 Sample Collection. A schematic of the sampling,train used in performing this method is shown in Figure 7-1.,Other grab sampling systems or equipment, capable of,648,measuring sample volume to within 2.0 percent and collecting,a sufficient sample volume to allow analytical,reproducibility to within 5 percent, will be considered,acceptable alternatives, subject to the approval of the,Administrator. The following items are required for sample,collection:,6.1.1 Probe. Borosilicate glass tubing, sufficiently,heated to prevent water condensation and equipped with an,in-stack or heated out-of-stack filter to remove particulate,matter (a plug of glass wool is satisfactory for this,purpose). Stainless steel or Teflon tubing may also be used,for the probe. Heating is not necessary if the probe,remains dry during the purging period.,6.1.2 Collection Flask. Two-liter borosilicate,round bottom flask, with short neck and 24/40 standard taper,opening, protected against implosion or breakage.,6.1.3 Flask Valve. T-bore stopcock connected to a,24/40 standard taper joint.,6.1.4 Temperature Gauge. Dial-type thermometer, or,other temperature gauge, capable of measuring 1 EC (2 EF),intervals from -5 to 50 EC (23 to 122 EF).,6.1.5 Vacuum Line. Tubing capable of withstanding a,vacuum of 75 mm (3 in.) Hg absolute pressure, with "T",connection and T-bore stopcock.,649,6.1.6 Vacuum Gauge. U-tube manometer, 1 meter (39,in.), with 1 mm (0.04 in.) divisions, or other gauge capable,of measuring pressure to within 2.5 mm (0.10 in.) Hg.,6.1.7 Pump. Capable of evacuating the collection,flask to a pressure equal to or less than 75 mm (3 in.) Hg,absolute.,6.1.8 Squeeze Bulb. One-……
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