HJ 732-2014 English PDF

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HJ 732-2014: Emission from stationary sources. Sampling of volatile organic compounds. Bags method
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Basic data

Standard ID: HJ 732-2014 (HJ732-2014)
Description (Translated English): Emission from stationary sources. Sampling of volatile organic compounds. Bags method
Sector / Industry: Environmental Protection Industry Standard
Classification of Chinese Standard: Z25
Classification of International Standard: 13.040.40
Word Count Estimation: 12,115
Date of Issue: 12/31/2014
Date of Implementation: 2/1/2015
Quoted Standard: HJ/T 397
Regulation (derived from): Ministry of Environmental Protection Notice 2014 No. 91
Issuing agency(ies): Ministry of Ecology and Environment
Summary: This standard specifies the use of polyvinyl fluoride (PVF) and other fluoropolymer film bag manually collect temperature below 150 �� Stationary source emission of volatile organic compounds (VOCs) method. This standard applies to sampling Stationary sour

HJ 732-2014: Emission from stationary sources. Sampling of volatile organic compounds. Bags method

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Emission from stationary sources.Sampling of volatile organic compounds.Bags method National Environmental Protection Standard of the People 's Republic of China Sampling air bag method for volatile organic matter from fixed sources Emission from stationary sources-Sampling of volatile organic Compounds-Bags method Released on.2014-12-31 2015-02-01 implementation Ministry of Environmental Protection released I directory Preface ii 1 Scope of application 1 2 equipment and materials 1 Principle of Method 1 4 equipment and materials 1 5 sampling 2 5.1 sampling position, sampling frequency and sampling time 2 5.2 Installation of sampling system 2 5.3 Sampling Step 3 5.4 Storage and transportation of samples 3 5.5 Analysis of samples 3 6 quality assurance and quality control 4 Appendix A (informative) Some VOCs gas samples are stored in three fluoropolymer film storage bags.

Foreword

To implement the "Environmental Protection Law" and "Air Pollution Prevention Law" to protect the environment, protect human health, the development of this standard. This standard specifies the use of fluoropolymer film air bags on the fixed source of volatile organic compounds in the sampling method. This standard is the first release. Appendix A of this standard is an informative appendix. This standard is organized by the Ministry of Environmental Protection Science and Technology Standards Division. The main drafting unit of this standard. Shanghai Environmental Monitoring Center, Tongji University, China Environmental Monitoring Station. This standard is approved by the Ministry of Environmental Protection on December 31,.2014. This standard is implemented on February 01,.2015. This standard is explained by the Ministry of Environmental Protection.

1 Sampling air bag method for volatile organic compounds

1. Applicable scope This standard specifies the use of fluoroprene (PVF) and other fluoropolymer film bags manually collected temperature below 150 ℃ fixed pollution sources Methods for the Volatile Organic Compounds (VOCs) in Exhaust. This standard applies to the sampling of non-methane total hydrocarbons and partial VOCs in fixed sources of exhaust gas. VOCs suitable for use in this process include Experiments have been carried out to verify that the compounds can be stably preserved in the material type air bag used. Three kinds of fluoropolymer film material bag storage 61 kinds See Appendix A for the performance indicators of VOCs. 2. Normative references to documents The contents of this standard refer to the terms of the following documents. For undated references, the valid version applies to this standard. Technical specification for HJ/T 397 fixed source exhaust gas monitoring 3. Methodology The use of vacuum boxes, pumps and other equipment will be fixed pollution source exhaust pipe emissions directly collected and preserved to the chemical inert Of the fluoropolymer film in the air bag. 4. Equipment and materials 4.1 Air bag sampling system 1-exhaust pipe; 2-glass wool filter head; 3-Teflon connecting tube; 4-heated sampling tube; 5-quick connector male; 6-quick connector female; 7 - sample air bag; 8 - vacuum box; 9 - valve; 10 - activated carbon filter; 11 - pump. Figure 1 Airbag sampling system 24.8 Glass wool filter head Installed in the front of the sampling tube, filling the experimental cleaning glass wool, filter exhaust particles in the device. 4.1.2 sampling tube There is heating function, the inner wall should be stainless steel or coated with Teflon (Teflon) or quartz glass sampling tube. 4.1.3 Teflon connection tube Sufficient length of Teflon (Teflon) tube. 4.1.4 Sampling air bag Low adsorption and low gas permeability, do not release the interference material, the experimental verification of the target VOCs in the air bag can be stable Preserved fluoropolymer film bag. The storage properties of 61 VOCs in three fluoropolymer materials are shown in Appendix A. The results for the choice of air bag material reference. A Teflon material with a connection tube can be connected to the tube It is also a valve device that can be opened and closed. The volume of the sample bag is at least 1 L, depending on the minimum sample required for the analytical method Volume to select the sampling bag size specifications. Before sampling, observe the appearance of the air bag, check whether there are cracks and other leaks may be the case, If found to be abandoned. 4.1.5 vacuum box Transparent or observing holes, with sufficient strength of plexiglass or stainless steel sealed containers, vacuum box cover can be opened, cover The bottom four sides have a seal. 4.1.6 Valves Control and switch sampling airflow. 4.1.7 Activated carbon filter Intermediate filled with activated carbon, both ends of the glass wool to fill. 4.1.8 Pumps A diaphragm pump or other type of pump that provides at least a flow rate of 0.1 to 1 L/min should be able to overcome the resistance of the flue and sampling system. If the sampling site explosion-proof safety requirements, the pump must be explosion-proof safety certification with explosion-proof function. 4.2 Sample storage container Contains containers that are protected from light. 4.3 Sample heating box The air bag sample can be heated to a heating vessel of 120 ° C (± 5 ° C). 5. Sampling 5.1 sampling position, sampling frequency and sampling time Sampling position, sampling frequency and sampling time selection and related operations to implement the relevant provisions of HJ/T 397. 35.2 Installation of sampling system 5.2.1 Install the sampling system as shown in Figure 1. 5.2.2 Leakage check After the system is connected, the sampling system should be checked for air tightness. Remove the glass wool filter (4.1.1), block the sampling tube (4.1.2) Front, with a three-way vacuum pressure gauge installed in the regulator before the valve on the pipeline, and then through the quick connector (or other means) to jump The vacuum chamber is connected directly to the Teflon connection tube; open the suction pump (4.1.8) to allow the vacuum gauge to read to 13 kPa, close Control valve; if the vacuum pressure gauge in 1 min down less than 0.15 kPa, then the system is not leaked. Such as the discovery of leakage should be divided Check, find out the leak, timely solution. 5.3 Sampling steps 5.3.1 Sampling the air bag directly connected to the pump, the gas bag in the bag after the pump into the vacuum box, and close the sealed vacuum box. 5.3.2 The heated sampling tube into the sampling hole, the inlet position should be as close as possible to the center of the discharge pipe, if the exhaust pipe exhaust The temperature is higher than the ambient temperature, then open the heating tube power supply, the sampling tube heated to 120 ℃ (± 5 ℃). 5.3.3 Connect the pipe in front of the valve directly to the Teflon connection pipe via the quick connector (or other means), jump the vacuum chamber And then open the pump to continue pumping for some time, the sampling tube of gas into the exhaust pipe of the gas, and then disconnect (If you do not use the self-styled quick connector connection shown in Figure 1, you will need to take other ways to disconnect the Teflon Tube end closed). 5.3.4 Quickly connect the Teflon sampling tube to the interface of the vacuum box access air bag, connect the pipe in front of the adjustment valve to the vacuum box An interface, air connection as shown in Figure 2 (a), began sampling. Observe the air bag inside the vacuum box, when the air bag inside the sample volume to reach the air bag The maximum volume of about 80% of the sampling end, close the pump. Disconnect the Teflon connection from the vacuum box connector (if not used) After disconnecting the quick-connect quick connector connection, you will need to take the other way to disconnect the Teflon connection tube and the vacuum box interface Closed). Figure 2 (a) Figure 2 (b) Figure 2 Schematic diagram of sampling and exhaust gas connections 5.3.5 Connect the pump directly to the interface of the vacuum box to the sampling bag. The air connection is shown in Figure 2 (b). Open the pump The sample gas in the bag is drained. 5.3.6 repeat the above 5.3.4 and 5.3.5 steps 3 times, so that the sample gas aging the inner surface of the bag to reduce the adsorption of the inner surface of the bag 4 sample loss interference. 5.3.7 to restore the sampling air connection, as shown in Figure 2 (a), when the bag size of the bag to reach the maximum volume of about 80% Sampling is completed, close the pump on the pump and the air bag, remove the air bag and label the sample number. 5.3.8 Determine and record the exhaust gas temperature, exhaust gas flow and moisture content in the exhaust pipe. The procedure is to implement the relevant regulations of HJ/T 397. 5.3.9 record the sample number, sample sampling conditions, ambient temperature, atmospheric pressure, sampling time and other information, other related Record the relevant provisions for the implementation of HJ/T 397. 5.4 Storage and transportation of samples At the end of sampling, the bag sample is immediately stored in a container (4.2) protected from light and removed until the sample is analyzed. 5.5 Analysis of samples Airbag samples should be analyzed in time, usually within 8 hours after sampling injection analysis. If you need to extend the sample retention time, Refer to Appendix A to determine, or to confirm the experiment with the target VOCs of the standard gas in the use of different types of materials used in the preservation of airbags Between the recovery rate. Before the sample analysis to observe the inner wall of the sample bag, if there is droplet condensation phenomenon, the air bag should be put into the heating box, to confirm After the droplet condensation phenomenon is removed, the bag is taken out quickly. 6. Quality assurance and quality control 6.1 Sample collection should be given priority to the use of new bags. If you want to reuse the sample bag, you must perform a blank experiment before sampling. Have already made Used in the air bag into the gas in addition to zero gas sealed, room temperature for a period of time, the placement time is not less than the actual monitoring of the sample preservation Time, and then use the same steps as the sample analysis to determine the target VOCs concentration, if the concentration is lower than the method detection limit, Continue to use the air bag, empty the bag after the gas to save; otherwise you must abandon. 6.2 If the target VOCs or pouch material is not included in Appendix A, the storage performance of the target VOCs in the air bag shall be in accordance with the Appendix A.1, and the validation report is attached to the monitoring report. 6.3 Sampling tube The inlet position should be as close as possible to the center of the discharge pipe. The length of the sampling tube should be as short as possible.

5 Appendix A

(Informative) Preservation experiment of some VOCs gas samples in three kinds of fluoropolymer film sampling air bag A.1 Determination of the recovery rate of gaseous VOCs in air bags A standard gas close to the actual sample concentration was injected into an unused air bag, and the same analytical method was used to measure the gas The initial concentration of the target VOCs in the bag and the concentration after storage at different temperatures under normal temperature conditions were calculated according to the following formula (1).  I C CP (1) Where. Pi - standard gas sample recovery rate; Ci - standard gas in the test bag at room temperature after a period of time to save the concentration, mg/m3; C0i - initial concentration of standard gas in the test bag, mg/m3. A.2 Storage Results of 61 VOCs Gas Samples in Three Fluoropolymer Film Sampling Air Bags Table A.1 61 kinds of VOCs gas samples 1, 2 in the air bag to save 8 hours and 24 hours after the recovery Chemical Abstracts The name of the compound Recovery after 8 hours (%) Recovery after 24 hours (%) Polyvinyl Fluoride (PVF) Polyfluoroethylene glycol (FEP) Copolymerized vinylidene fluoride (S-PVDF) Polyvinyl Fluoride (PVF) Polyfluoroethylene glycol (FEP) Copolymerized vinylidene fluoride (S-PVDF) 115-07-1 Propylene 99.1 99.0 86.5 97.0 90.4 78.4 75-71-8 dichlorodifluoromethane 90.4 85.2 73.0 78.7 78.1 72.6 74-87-3 Chloromethane 98.3 96.9 87.9 97.0 90.0 84.4 76-14-2 dichlorotetrafluoroethane 94.5 92.6 78.1 86.3 85.1 76.8 75-01-4 Vinyl chloride 99.4 97.5 81.8 92.6 85.4 79.6 106-99-0 1,3-butadiene 92.1 94.6 83.5 92.2 85.4 79.8 74-83-9 Bromomethane 87.8 84.7 79.2 77.2 75.3 71.0 75-00-3 Chloroethane 88.7 89.3 88.1 87.7 85.1 80.8 67-64-1 Acetone 88.7 96.7 84.0 81.5 75.5 65.6 75-69-4 Trichlorofluoromethane 82.4 77.2 73.3 70.8 71.0 68.2 67-63-0 isopropanol 89.1 79.2 85.5 77.5 86.2 72.8 75-35-4 1,1-dichloroethylene 87.7 82.7 79.0 74.1 73.1 71.8 75-15-0 Carbon disulfide 98.7 76.8 88.5 87.1 74.9 82.0 75-9-2 dichloromethane 90.8 75.2 81.1 74.1 74.0 68.2 76-13-1 Trichlorotrifluoroethane 85.4 80.4 86.6 92.4 93.6 88.4 156-60-5 negatively - 1,2 - dichloroethylene 95.1 90.7 89.2 81.3 73.2 76.3 75-34-3 1,1-dichloroethane 98.6 96.7 92.2 86.1 87.9 81.2 1634-04-4 Methyl Dibutyl Ether 97.3 98.2 90.0 82.4 84.3 72.1 108.5-4 Vinyl Acetate 95.4 96.5 90.4 81.6 76.0 68.0 78-93-3 methyl ethyl ketone 96.6 95.6 96.8 85.7 82.2 69.6 156-59-2 cis-1,2-dichloroethylene 96.2 93.7 90.8 80.9 81.1 76.8 110-54-3 n-hexane 95.3 93.1 97.7 95.9 92.8 89.9 67-66-3 chloroform 95.8 91.5 87.3 79.8 80.2 76.9 Ethyl acetate 95.2 94.9 95.5 83.6 78.5 75.0

6 Chemical Abstracts

The name of the compound Recovery after 8 hours (%) Recovery after 24 hours (%) Polyvinyl Fluoride (PVF) Polyfluoroethylene glycol (FEP) Copolymerized vinylidene fluoride (S-PVDF) Polyvinyl Fluoride (PVF) Polyfluoroethylene glycol (FEP) Copolymerized vinylidene fluoride (S-PVDF) 109-99-9 tetrahydrofuran 99.2 64.5 96.0 97.0 86.3 88.7 107-06-2 1,2-dichloroethane 87.0 87.5 79.9 72.1 73.0 67.0 71-55-6 1,1,1-trichloroethane 93.4 90.4 85.7 78.8 79.8 75.4 71-43-2 benzene 99.5 99.9 97.8 89.2 86.3 81.7 56-23-5 Carbon tetrachloride 93.6 90.5 86.3 79.3 79.2 75.9 110-82-7 Cyclohexane 94.6 98.1 96.5 94.6 96.8 91.9 78-87-5 1,2-dichloropropane 95.1 96.0 98.5 89.4 87.9 80.4 75-27-4 bromo dichloromethane 92.9 91.7 86.4 76.5 76.9 74.3 79-01-6 Trichlorethylene 95.2 94.9 96.1 87.0 76.0 84.3 123-91-1 1,4-dioxane 95.6 99.4 72.6 80.7 97.2 75.6 142-82-5 heptane 93.7 94.0 94.9 100.0 91.1 96.9 10061-01-5 cis-1,3-dichloropropene 93.8 99.1 90.8 76.2 75.7 71.6 108-10-1 methyl isobutyl ketone 98.8 99.0 84.3 81.7 79.3 72.2 10061-02-6 Inverse 1,3-dichloropropene 87.7 95.6 84.4 64.0 68.0 62.9 79-00-5 1,1,2-trichloroethane 96.5 99.5 94.1 79.9 80.1 77.5 108-88-3 Toluene 94.6 68.0 97.7 81.6 76.0 75.3 626-93-7 Methylbutyl ketone 99.9 97.1 85.7 78.6 70.6 67.6 124-48-1 Dibromochloromethane 92.3 98.1 90.5 75.1 77.1 72.6 Methoxyethane 92.7 98.2 92.1 70.3 73.2 69.4 Polyvinyl Chloride 98.4 90.5 92.7 82.5 64.3 80.9 108-90-7 Chlorobenzene 90.9 94.4 91.8 63.3 61.4 67.5 100-41-4 ethylbenzene 94.3 95.0 95.2 66.1 63.5 67.5 106-42-3, p-xylene 92.6 91.7 91.4 62.9 58.3 65.2 75-25-2 bromoform 88.2 98.5 88.1 59.0 70.2 64.1 100-42-5 Styrene 90.1 93.9 94.5 53.7 57.3 62.4 79-34-5 1,1,2,2-tetrachloroethane 93.9 97.8 90.0 65.2 71.1 66.4 95-47-6 o-xylene 95.4 91.5 93.4 62.6 61.4 66.1 622-96-8 4-ethyl toluene 90.1 85.8 91.2 57.7 49.8 63.9 108-67-8 1,3,5-trimethylbenzene 91.8 88.2 89.6 58.7 54.7 65.7 95-63-6 1,2,4-trimethylbenzene 87.7 82.6 89.2 53.6 48.6 62.5 541-73-1 1,3-dichlorobenzene 80.3 73.5 86.8 44.8 38.3 58.0 106-46-7 1,4-Dichlorobenzene 80.3 73.5 86.8 44.8 38.3 58.0 95-50-1 1,2-Dichlorobenzene 77.8 76.6 82.4 42.9 40.8 54.3 120-82-1 1,2,4-trichlorobenzene 60.8 47.6 72.1 22.8 19.5 39.0 87-68-3 Hexachloro-1,3-butadiene 77.0 66.8 60.9 42.9 43.3 55.6 107-13-1 Acrylonitrile > 91.23 // 82.3 // Note. 1. 60 kinds of VOCs without acrylonitrile mixed gas, the compound concentration of 1.0 μmol/mol; 2. Acrylonitrile gas concentration of 41.9 μmol/mol. ; 3. The recovery rate of acrylonitrile standard gas stored in PVF bag for 12 hours. ......

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