EPA Method 308 Procedure for Determination of Methanol Emission from Stationary Sources
|
ID： |
C0926FE156644E50AC3EA308B42E66E2 |
|
文件大小(MB)： |
0.06 |
|
页数： |
14 |
|
文件格式： |
|
|
日期： |
1998-5-13 |
|
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）：
3. Appendix A of part 63 is amended by adding Method 308 in,numerical order to read as follows:,Appendix A to Part 63--Test Methods,* * * * *,Method 308--Procedure for Determination of Methanol Emission from,Stationary Sources,1.0 Scope and Application.,1.1 Analyte. Methanol. Chemical Abstract Service (CAS),No. 67-56-1.,1.2 Applicability. This method applies to the measurement,of methanol emissions from specified stationary sources.,2.0 Summary of Method. A gas sample is extracted from the,sampling point in the stack. The methanol is collected in,deionized distilled water and adsorbed on silica gel. The sample,is returned to the laboratory where the methanol in the water,fraction is separated from other organic compounds with a gas,chromatograph (GC) and is then measured by a flame ionization,detector (FID). The fraction adsorbed on silica gel is extracted,with an aqueous solution of n-propanol and is then separated and,measured by GC/FID.,3.0 Definitions. [Reserved],4.0 Interferences. [Reserved],5.0 Safety.,5.1 Disclaimer. This method may involve hazardous,materials, operations, and equipment. This test method does not,purport to address all of the safety problems associated with its,use. It is the responsibility of the user of this test method to,establish appropriate safety and health practices and to,determine the applicability of regulatory limitations before,performing this test method.,5.2 Methanol Characteristics. Methanol is flammable and a,dangerous fire and explosion risk. It is moderately toxic by,ingestion and inhalation.,6.0 Equipment and Supplies.,6.1 Sample Collection. The following items are required,for sample collection:,6.1.1 Sampling Train. The sampling train is shown in,Figure 308-1 and component parts are discussed below.,6.1.1.1 Probe. Teflon?, approximately 6-millimeter (mm),(0.24 inch) outside diameter.,6.1.1.2 Impinger. A 30-milliliter (ml) midget impinger.,The impinger must be connected with leak-free glass connectors.,Silicone grease may not be used to lubricate the connectors.,6.1.1.3 Adsorbent Tube. Glass tubes packed with the,required amount of the specified adsorbent.,6.1.1.4 Valve. Needle valve, to regulate sample gas flow,rate.,6.1.1.5 Pump. Leak-free diaphragm pump, or equivalent, to,pull gas through the sampling train. Install a small surge tank,between the pump and rate meter to eliminate the pulsation effect,of the diaphragm pump on the rotameter.,6.1.1.6 Rate Meter. Rotameter, or equivalent, capable of,measuring flow rate to within 2 percent of the selected flow rate,of up to 1000 milliliter per minute (ml/min). Alternatively, the,tester may use a critical orifice to set the flow rate.,6.1.1.7 Volume Meter. Dry gas meter (DGM), sufficiently,accurate to measure the sample volume to within 2 percent,calibrated at the selected flow rate and conditions actually,encountered during sampling, and equipped with a temperature,sensor (dial thermometer, or equivalent) capable of measuring,temperature accurately to within 3 oC (5.4 oF).,6.1.1.8 Barometer. Mercury (Hg), aneroid, or other,barometer capable of measuring atmospheric pressure to within,2.5 mm (0.1 inch) Hg. See the NOTE in Method 5 (40 CFR part 60,appendix A), section 6.1.2.,6.1.1.9 Vacuum Gauge and Rotameter. At least 760-mm (30-,inch) Hg gauge and 0- to 40-ml/min rotameter, to be used for,leak-check of the sampling train.,6.2 Sample Recovery. The following items are required for,sample recovery:,6.2.1 Wash Bottles. Polyethylene or glass, 500-ml, two.,6.2.2 Sample Vials. Glass, 40-ml, with Teflon?-lined,septa, to store impinger samples (one per sample).,6.2.3 Graduated Cylinder. 100-ml size.,6.3 Analysis. The following are required for analysis:,6.3.1 Gas Chromatograph. GC with an FID, programmable,temperature control, and heated liquid injection port.,6.3.2 Pump. Capable of pumping 100 ml/min. For flushing,sample loop.,6.3.3 Flow Meter. To monitor accurately sample loop flow,rate of 100 ml/min.,6.3.4 Regulators. Two-stage regulators used on gas,cylinders for GC and for cylinder standards.,6.3.5 Recorder. To record, integrate, and store,chromatograms.,6.3.6 Syringes. 1.0- and 10-microliter (l) size,calibrated, for injecting samples.,6.3.7 Tubing Fittings. Stainless steel, to plumb GC and,gas cylinders.,6.3.8 Vials. Two 5.0-ml glass vials with screw caps fitted,with Teflon?-lined septa for each sample.,6.3.9 Pipettes. Volumetric type, assorted sizes for,preparing calibration standards.,6.3.10 Volumetric Flasks. Assorted sizes for preparing,calibration standards.,6.3.11 Vials. Glass 40-ml with Teflon?-lined septa, to,store calibration standards (one per standard).,7.0 Reagents and Stan……
……