1.1 本试验方法采用直接界面气相色谱/质谱仪（GCMS）来识别和量化以下列出的36种挥发性有机化合物（或这些化合物的子集）。每个化合物后面都列出了单个化学文摘社（CAS）的编号。 苯-71432 二氯甲烷-75092 溴二氯甲烷-75274 1,1,2,2-四氯乙烷-79349 二硫化碳-75150 1,1,1-三氯乙烷-71556 氯仿-67663 1,1,2-三氯乙烷-79005 甲基异丁酮-108101 对二甲苯-106423 苯乙烯-100425 溴甲烷-74839 四氯乙烯-127184 四氯化碳-56235 甲苯-108883 氯苯-108907 溴仿-75252 c-1,3-二氯丙烯-10061015 醋酸乙烯酯-108054 1,2-二氯乙烷-156592 氯乙烯-75014 1,1-二氯乙烯-75354 氯甲烷-74873 t-1,2-二氯乙烯-156605 顺-1,2-二氯乙烯-156592 甲乙酮- 78933 二溴氯甲烷-124481 2-己酮-591786 1,1-二氯乙烷-107062 t-1,3-二氯丙烯-542756 1,2-二氯丙烷-78875 三氯乙烯-79016 乙苯-100414 间二甲苯-108383 乙基氯化物-75003 邻二甲苯-95476 1.2 该测试方法结合了基于性能的方法，该方法通过在仪器对气体内标物及其特定质谱相对丰度的响应上设置边界来验证每个GCMS分析。使用这种方法，试验方法可以扩展到分析其他化合物。 1.3 该测试方法提供了对来自固定源的提取、无条件和不饱和（在仪器上）气体样本的现场分析。含水量高的气流可能需要调节，以防止仪器内出现水汽凝结。对于这些样品，测试方法中提供了质量保证（QA）要求，以验证极性水的分析- 可溶性化合物。 1.4 仪器范围应足以使用全扫描操作（45至300个原子质量单位）测量150 ppb（v）至100 ppm（v）的列出挥发性有机化合物。可以使用以下任一程序将范围扩展到更高或更低的浓度: 1.4.1 调整初始三点校准浓度和持续校准检查，以匹配堆栈浓度，或 1.4.2 三点校准扩展到包括额外浓度，以覆盖测量范围。 1.5 最低量化水平为50 % 最低校准浓度。低于该水平的响应被视为估计浓度，除非在较低浓度下进行校准标准检查以证明线性。GCMS测量系统对单个目标分析物的灵敏度取决于: 1.5.1 每个目标分析物的特定仪器响应和可用质谱定量离子的数量。 1.5.2 仪表噪音的大小，以及 1.5.3 样气的含水量百分比。 1.6 以国际单位制表示的数值应视为标准值。本标准不包括其他计量单位。 1.7 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 第节介绍了其他安全预防措施 9 . 1.8 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 ====意义和用途====== 5.1 该现场测试方法确定第节中列出的VOHAP（或任何子集）的质量浓度 1. . 5.2 将质量浓度乘以出水体积流量（见 2.2 )产生质量排放率。 5.3 该现场测试方法在常见应用中采用实验室GCMS技术和质量保证/质量控制（QC）程序。 5.4 这种现场测试方法提供的数据的准确性和精密度与大多数实验室GCMS仪器类似。

1.1 This test method employs a direct interface gas chromatograph/mass spectrometer (GCMS) to identify and quantify the 36 volatile organic compounds (or sub-set of these compounds) listed as follows. The individual Chemical Abstract Service (CAS) numbers are listed after each compound. Benzene-71432 Methylene chloride-75092 Bromodichloromethane-75274 1,1,2,2-Tetrachloroethane-79349 Carbon disulfide-75150 1,1,1-Trichloroethane-71556 Chloroform-67663 1,1,2-Trichloroethane-79005 Methyl iso-Butyl ketone-108101 p-Xylene-106423 Styrene-100425 Bromomethane-74839 Tetrachloroethylene-127184 Carbon tetrachloride-56235 Toluene-108883 Chlorobenzene-108907 Bromoform-75252 c-1,3-Dichloropropene-10061015 Vinyl acetate-108054 1,2-Dichloroethane-156592 Vinyl chloride-75014 1,1-Dichloroethene-75354 Chloromethane-74873 t-1,2-Dichloroethene-156605 cis-1,2-Dichloroethene-156592 Methyl ethyl ketone-78933 Dibromochloromethane-124481 2-Hexanone-591786 1,1-Dichloroethane-107062 t-1,3-Dichloropropene-542756 1,2-Dichloropropane-78875 Trichloroethene-79016 Ethylbenzene-100414 m-Xylene-108383 Ethyl chloride-75003 o-Xylene-95476 1.2 The test method incorporates a performance-based approach, which validates each GCMS analysis by placing boundaries on the instrument response to gaseous internal standards and their specific mass spectral relative abundance. Using this approach, the test method may be extended to analyze other compounds. 1.3 The test method provides on-site analysis of extracted, unconditioned, and unsaturated (at the instrument) gas samples from stationary sources. Gas streams with high moisture content may require conditioning to prevent moisture condensation within the instrument. For these samples, quality assurance (QA) requirements are provided in the test method to validate the analysis of polar, water-soluble compounds. 1.4 The instrument range should be sufficient to measure the listed volatile organic compounds from 150 ppb(v) to 100 ppm(v), using a full scan operation (between 45 and 300 atomic mass units). The range may be extended to higher or lower concentrations using either of the following procedures: 1.4.1 The initial three-point calibration concentrations and the continuing calibration checks are adjusted to match the stack concentrations, or 1.4.2 The three-point calibration is extended to include additional concentrations to cover the measurement range. 1.5 The minimum quantification level is 50 % of the lowest calibration concentration. Responses below this level are considered to be estimated concentrations, unless a calibration standard check is conducted at a lower concentration to demonstrate linearity. The sensitivity of the GCMS measurement system for the individual target analytes depends upon: 1.5.1 The specific instrument response for each target analyte and the number of mass spectral quantification ions available. 1.5.2 The amount of instrument noise, and 1.5.3 The percent moisture content of the sample gas. 1.6 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.7 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Additional safety precautions are described in Section 9 . 1.8 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 5.1 This field test method determines the mass concentration of VOHAPs (or any subset) listed in Section 1 . 5.2 Multiplying the mass concentration by the effluent volumetric flow rate (see 2.2 ) yields mass emission rates. 5.3 This field test method employs laboratory GCMS techniques and QA/quality control (QC) procedures in common application. 5.4 This field test method provides data with accuracy and precision similar to most laboratory GCMS instrumentation.