EPA Method 26 Determination Of Hydrogen Halide And Halogen Emissions From Stationary Sources Non-Isokinetic Method
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ID： |
B0ED3A2F2191459ABB8F41CFA3DAC6E9 |
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文件大小(MB)： |
0.26 |
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页数： |
26 |
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日期： |
2000-2-12 |
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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）：
1331,METHOD 26 - DETERMINATION OF HYDROGEN HALIDE AND,HALOGEN EMISSIONS FROM STATIONARY SOURCES,NON-ISOKINETIC METHOD,1.0 Scope and Application.,1.1 Analytes.,Analytes CAS No.,Hydrogen Chloride (HCl) 7647-01-0,Hydrogen Bromide (HBr) 10035-10-6,Hydrogen Fluoride (HF) 7664-39-3,Chlorine (Cl2) 7882-50-5,Bromine (Br2) 7726-95-6,1.2 Applicability. This method is applicable for,determining emissions of hydrogen halides (HX) [HCl, HBr,and HF] and halogens (X2) [Cl2 and Br2] from stationary,sources when specified by the applicable subpart. Sources,such as those controlled by wet scrubbers, that emit acid,particulate matter must be sampled using Method 26A.,1.3 Data Quality Objectives. Adherence to the,requirements of this method will enhance the quality of the,data obtained from air pollutant sampling methods.,2.0 Summary of Method.,2.1 An integrated sample is extracted from the source,and passed through a prepurged heated probe and filter into,dilute sulfuric acid and dilute sodium hydroxide solutions,which collect the gaseous hydrogen halides and halogens,1332,respectively. The filter collects particulate matter,including halide salts but is not routinely recovered and,analyzed. The hydrogen halides are solubilized in the,acidic solution and form chloride (Cl-), bromide (Br-), and,fluoride (F-) ions. The halogens have a very low solubility,in the acidic solution and pass through to the alkaline,solution where they are hydrolyzed to form a proton (H+),the halide ion, and the hypohalous acid (HClO or HBrO).,Sodium thiosulfate is added in excess to the alkaline,solution to assure reaction with the hypohalous acid to form,a second halide ion such that 2 halide ions are formed for,each molecule of halogen gas. The halide ions in the,separate solutions are measured by ion chromatography (IC).,3.0 Definitions. [Reserved],4.0 Interferences.,4.1 Volatile materials, such as chlorine dioxide,(ClO2) and ammonium chloride (NH4Cl), which produce halide,ions upon dissolution during sampling are potential,interferents. Interferents for the halide measurements are,the halogen gases which disproportionate to a hydrogen,halide and a hydrohalous acid upon dissolution in water.,However, the use of acidic rather than neutral or basic,solutions for collection of the hydrogen halides greatly,1333,reduces the dissolution of any halogens passing through this,solution.,4.2 The simultaneous presence of HBr and CL2 may,cause a positive bias in the HCL result with a corresponding,negative bias in the Cl2 result as well as affecting the,HBr/Br2 split.,4.3 High concentrations of nitrogen oxides (NOx) may,produce sufficient nitrate (NO3,-) to interfere with,measurements of very low Br- levels.,4.4 A glass wool plug should not be used to remove,particulate matter since a negative bias in the data could,result.,4.5 There is anecdotal evidence that HF may be,outgassed from new teflon components. If HF is a target,analyte, then preconditioning of new teflon components, by,heating should be considered.,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 determine the,applicability of regulatory limitations before performing,this test method.,1334,5.2 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,and decontaminate. Treat residual chemical burns as thermal,burns.,5.2.1 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.,5.2.2 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.,6.0 Equipment and Supplies.,NOTE: Mention of trade names or specific products,does not constitute endorsement by the Environmental,Protection Agency.,6.1 Sampling. The sampling train is shown in,1335,Figure 26-1, and component parts are discussed below.,6.1.1 Probe. Borosilicate glass, approximately 3/8-,in. (9-mm) I.D. with a heating……
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