GMW-15654-2008.pdf
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1、 WORLDWIDE ENGINEERING STANDARDS Test Procedure Interior GMW15654 Determination of Volatile and Semi-Volatile Organic Compounds from Vehicle Interior Air Copyright 2008 General Motors Corporation All Rights Reserved March 2008 Originating Department: North American Engineering Standards Page 1 of 16
2、 1 Scope Note: Nothing in this standard supersedes applicable laws and regulations. Note: In the event of conflict between the English and domestic language, the English language shall take precedence. 1.1 Purpose. This test procedure is used for the qualitative and quantitative determination of Vol
3、atile Organic Compound (VOC) and Semi- Volatile Organic Compound (SVOC) emissions in vehicle interior air utilizing Tenax TA adsorbent media and Thermal Desorption - Gas Chromatography / Mass Selective Detection (TD-GC/MSD). 1.1.1 Individual VOC and SVOC emissions in different vehicle interior air s
4、amples can be identified, quantified, and compared. 1.1.2 In combination with GMW15634 the sources of VOCs and SVOCs in vehicle air can be identified. 1.1.3 VOC emissions are in the boiling point range 345C or chromatographic elution range from n-pentane (n-C5) to n-eicosane (n-C20), and SVOC emissi
5、ons are in the boiling range 280C or chromatographic elution range from n- hexadecane (n-C16) to n-dotriacontane (n-C32). This procedure can determine all of these components in vehicle interior air. 1.2 Foreword. Determination of VOCs and SVOCs in vehicle interior air is essential to meet customer
6、requirements and regulatory requirements in some global markets. Concentrations are in the g/m3 range which warrants accurate analytical measurements. 1.3 Applicability. This test procedure should be used for all vehicles for the determination of VOC and SVOC emissions in the vehicle interior air. T
7、he results will provide complementary information to interpret findings in GMW3205, GMW3235, GMW3059 and GMW15635. Moreover, the test procedure can be used to pursue customer complaints regarding odor. The analytical instrumentation described herein can also be used in GMW15634 to determine the sour
8、ces of VOCs and SVOCs in interior materials. 1.3.1 This test procedure was modified from EPA TO-17. 1.3.2 This test procedure complements GMW8081 and GMW15600. 2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. EPA
9、TO-17 2.2 GM Standards/Specifications. GMW3059 GMW15600 GMW3205 GMW15634 GMW3235 GMW15635 GMW8081 2.3 Additional References. AK-101AA-ARO-PAK 3 Resources 3.1 Facilities. For testing the car interior air, a test chamber is needed. The latest draft regulations from Japan Automobile Manufacturers Assoc
10、iation (JAMA self commitment), China (legislation), and South Korea (legislation) contain information on test chambers. 3.2 Equipment. This test procedure utilizes commonly available equipment and instrumentation. Specific instrumentation and test conditions are noted in Appendix A. 3.2.1 Balance wi
11、th a sensitivity of 0.01 mg. 3.2.2 Directly Coupled Thermodesorption-Gas Chromatography System with Cryofocusing and Split System. This instrumentation may be purchased at . 3.2.3 Gas Chromatograph (GC) with mass- selective detector, software and mass spectra library. This instrumentation may be pur
12、chased at . 3.2.4 GC Capillary Columns. GC Capillary Guard Column is used to prevent thermal shock to GMW15654 GM WORLDWIDE ENGINEERING STANDARDS Copyright 2008 General Motors Corporation All Rights Reserved Page 2 of 16 March 2008 increase capillary column longevity. A low-Bleed GC/MS Capillary Col
13、umn, Stationary Phase: (5%-phenyl) - methylpolysiloxane is used (e.g., 60 m x 0.32 mm x 0.50 m DB-5MS capillary column, Agilent P/N 123-5566, see Appendix A). 3.2.5 Tenax TA (or equivalent), Glass Thermal Desorption Tubes (GTDT). Compatible with the specific corresponding thermal desorption system.
14、(See Figure H1.) The tubes may be purchased at . 3.2.6 Tube-Spiking Adapter for spiking liquid standards onto Tenax tubes and evaporating the solvent. See Figure H2 for details. Other tube- spiking apparatus can be used. 3.2.7 Carrier Gas. Grade 5.0 Helium and a corresponding in-line purifier trap i
15、s used for the GC carrier gas, the Tenax TA Glass Thermal Desorption Tubes (GTDTs) conditioning purge gas, and the Tube-Spiking Adapter gas. 3.2.8 Conditioning Tenax TA Glass Thermal Desorption Tubes (GTDTs). Tenax filled tubes must be conditioned thermally with an apparatus designed for that purpos
16、e; such as a Dynatherm Model 9600 six-tube conditioner, or equivalent. Set the helium purge gas flow rate to 30 to 40 mL/minute for each port. Conditioning consists of heating Tenax TA GTDTs at 320C continuously for 3 h 10 minutes. After thermal conditioning, the sorbent tubes should be packed airti
17、ght in aluminum foil or protective Teflon tubes to prevent contamination. The conditioning apparatus may be purchased at . 3.2.9 Syringes for Spiking Tubes: 10 L, 5 L, and 1 L syringes. 3.2.10 Solvents for Standard Dilutions. Methanol (MeOH), HPLC grade Methylene Chloride (MeCl2), HPLC grade 3.2.11
18、Standards and Dilutions. All standards and dilutions are to be kept in sealed containers and refrigerated at 8C when not in use. 3.2.11.1 Standards of desired VOC and SVOC components at 98% purity (or equivalent). Standards can be purchased at www.sigma- . 3.2.11.2 Check standard containing a mixtur
19、e of 18 individual components, 110 10 g/mL each in MeOH. (See Appendix B, B1.) 3.2.11.3 Calibration standard consisting of toluene and n-hexadecane, 500 50 g/mL each in MeOH. (See Appendix B, B2.) 3.2.11.4 n-Alkane Standard containing n-C5 to n- C32 of 28 individual n-alkane components, 2000 g/mL ea
20、ch in MeCl2. The n-Alkane standard can be custom blended and purchased at . 3.2.11.5 Aromatic Standard containing aromatic hydrocarbons, 14 individual components, 2000 g/mL each in MeOH. The aromatic standard AK-101AA-ARO-PAK can be purchased at . 3.2.11.6 Grob-Test Mix for testing the GC-column per
21、formance. This test mix can be purchased at www.sigma-. 3.2.12 Sampling Pump: Portable sampling pumps with a flow calibrator and a minimum flow range between 50 to 1000 mL/minute (e.g. Mine Safety Appliance Co. #49772 or Aircheck 2000) and an appropriate flow calibrator (e.g DC-1 flow calibrator BIO
22、S International #DC-MC-1). A pump and flow calibrator can be purchased at . 3.3 Test Vehicle/Test Piece. The vehicle to be tested is determined by the test director. The actual age of the vehicle may vary according to the purpose of the test. It may be a used vehicle with a customer complaint or a n
23、ew vehicle less than 28 days after production as required by sampling protocols. 3.3.1 The nominal temperature in the test vehicle interior air can range from 10 to 65C. However, at temperatures above 40C, the sampling tube should be placed outside the vehicle to ensure quantitative collection of th
24、e VOC and SVOC species. Vehicles may be pre-conditioned as required, and details should be documented. 3.4 Test Time. A pre-conditioning period for the vehicle lasting 2 to 12 h may be required in an environmentally controlled chamber at specific temperatures of 40 to 60C and 50 10% relative humidit
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