1、 WORLDWIDE ENGINEERING STANDARDS Test Procedure GMW8081 Static Headspace GC-MS for Interior Materials Interior Emissions Copyright 2011 General Motors Company All Rights Reserved December 2011 Originating Department: GME Specification Center Page 1 of 5 1 Scope Note: Nothing in this standard superce
2、des 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 standard is used for the semi-quantitative determination of emissions for interior materials via Headspace-Gas Chromatograph -
3、Mass Spectrometry (GC-MS). With the emission spectra: x Emissions of interior materials can be compared x Resultant emissions can be identified x Relative emissions can be calculated x Substances with regard to GMW3059 can be identified 1.2 Foreword. The test defined in this standard is designed to
4、evaluate the “emission“ tendencies of all interior and air ventilation system materials. The resulting rating “Relative Emission” influenced by the volatile organic constituents, liberated under conditions of high ambient temperatures and subsequently stays in the interior air, is determined. 1.3 Ap
5、plicability. All interior parts including HVAC ducts, trunk trim, and insulation having an air flow to the interior are included under this standard. For clarification refer to the responsible GM material engineer. All parts having an air flow to the interior with an area of 50 cm or a weight of 10
6、g shall be tested. For parts that are 10 g or the area is 50 cm the part shall be tested. The results will provide complementary information to GMW15634 and GMW3205. 2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications
7、. None 2.2 GM Standards/Specifications. GMW3059 GMW3205 GMW15634 3 Resources 3.1 Facilities. 3.1.1 Gas Chromatograph (GC) with split/splitless injector and mass-selective detector, software and mass spectra library e.g. Agilent HP6890 and Agilent HP5973. 3.1.2 GC Capillary Columns. Low-Bleed Gas Chr
8、omatograph Mass Spectrometer (GC/MS) Capillary Column, Stationary Phase: (5 %-phenyl)-methylpolysiloxane is used (e.g. HP Ultra 2 50 m x 0.32 mm x 0.52 Pm). 3.1.3 Headspace sampler, e.g. Agilent HP 7694. 3.2 Equipment. 3.2.1 Septum (non bleeding, heat resistant to +120 C). 3.2.2 Analytical balance (
9、accuracy: 1 mg). Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW8081 Copyright 2011 General Motors Company All Rights Reserved December
10、2011 Page 2 of 5 3.2.3 Vial (20 ml). 3.2.4 Locking tool for 20 ml Vials. 3.2.5 Suitable Cutting tools: Scissor, scalpel etc. 3.3 Test Vehicle/Test Piece. (2 0.1) g of the material to be tested shall be placed into a 20 ml vial. 3.4 Test Time. Not applicable. 3.5 Test Required Information. Not applic
11、able. 3.6 Personnel/Skills. Not applicable. 4 Procedure 4.1 Preparation. Using a cutting tool, a sample of the material shall be cut into small pieces each of which weighs 10 mg and AbundanceTIC: HK031.D data.msCopyright General Motors Company Provided by IHS under license with General Motors Compan
12、yNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW8081 Copyright 2011 General Motors Company All Rights Reserved December 2011 Page 4 of 5 Figure 2: Example of a Mass Spectrum 5 Data 5.1 Calculations. 5.1.1 Calculation of the ov
13、erall “Relative Emission” and the “Relative Emission” of single substances. Using the chromatogram, the total area of all emissions is determined by integration. The area of the “Air Peak” is subtracted from the total area. The resulting net area is divided by the area of the “Air Peak”. From this c
14、alculation the value for the overall “Relative Emission” is obtained (the area of the “Air Peak” can be used as an internal standard). With this value, interior materials can be mutually compared. Each analyte with a “Relative emission” 0.001 has to be identified and its individual “Relative Emissio
15、n” shall be calculated. For the “Relative Emission” of the single substances divide the area of the single substance by the area of the “Air Peak”. Note: The assumed approximations of the calculation of the “Relative Emission” withstand the comparison to an absolute determination. Because of the con
16、siderable additional expenditure of an absolute determination over standards, the method described here is considered extremely efficient and sufficient. 5.1.2 Examination of Emissions with Regard to GMW3059. All substances with a “Relative Emission” 0.001 are identified using mass spectrometry. A l
17、ist of this substances and their individual “Relative Emission” shall be included to the test report. With the help of the library search report restricted and reportable substances according to GMW3059 can be examined, in reference to the substances. 5.2 Interpretation of Results. Not applicable. 5
18、.3 Test Documentation. The test report shall include the overall “Relative Emission” value and a complete list of the identified individual analytes (“Relative Emission” 0.001) with their individual “Relative Emission” values. Include additional evaluations as appropriate. 6 Safety This standard may
19、 involve hazardous materials, operations, and equipment. This standard does not propose to address all the safety problems associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory
20、 limitations prior to use. 7 Notes 7.1 Glossary. Not applicable. 10 20 30 40 50 60 70 80 90 100 110 120 130050000100000150000200000250000300000350000400000450000500000550000m/ zAbundanceScan 1222 (9.548 min): HK031.D data.ms85.243.171.257.127.1128.3113.399.215.2Copyright General Motors Company Provi
21、ded by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW8081 Copyright 2011 General Motors Company All Rights Reserved December 2011 Page 5 of 5 7.2 Acronyms, Abbreviations, and Symbo
22、ls. Not applicable. 8 Coding System This standard shall be referenced in other documents, drawings, etc., as follows: Example: Test to GMW8081 - relative Emission 1.2 9 Release and Revisions This standard was originated in February 2005. It was first approved by WWW Interior Trim Team in May 2005. I
23、t was first published in May 2005. Issue Publication Date Description (Organization) 1 MAY 2005 Initial publication. 2 5 Year Refresh; content completely reworked; new template Ownership moved to the WWW Vehicle Interior Air Team in 2010. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
