1.1 本试验方法包括测定气态2,4-甲苯二异氰酸酯 iso 氰酸盐（2,4-TDI）和2,6-甲苯二异氰酸酯 iso 从工作场所和周围大气中采集的空气样本中的氰酸盐（2,6-TDI）。 1.2 差分空气采样使用分离装置进行。 2. 气体部分收集在浸渍有9-（N-甲胺甲基）蒽（MAMA）的玻璃纤维过滤器（GFF）上。 1.3 使用配备紫外线（UV）和荧光检测器的高效液相色谱仪（HPLC）对气体部分进行分析。也可以使用超高效液相色谱仪（UPLC），前提是其性能等同于本标准中的规定。 1.4 如Ref所述，单独进行气溶胶成分的分析 ( 1. ) . 3. 1.5 使用紫外线和荧光检测器，对0.014至1.16μg单体2,4-和2,6-TDI/2.0 mL解吸溶液（对应于0.001至0.077 mg/m的浓度）的本试验方法的应用范围进行验证 3. 基于15升空气样本的TDI。这对应于0.0.14至11 ppb（V），并包含1 ppb（V）的既定TLV值。 1.6 现场空白取样系统用于检查整个取样和分析过程中污染的可能性。 1.7 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。 1.8 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。 参见第节 9 其他危险。 1.9 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 TDI主要用于制备刚性和半刚性泡沫和粘合剂。 5.2 Di公司 iso 氰酸盐和聚 iso 氰酸盐对皮肤、眼睛和粘膜有刺激性。它们被认为会引起呼吸道过敏性致敏、哮喘性支气管炎和急性呼吸道中毒 ( 6- 9 ) . 5.3 美国政府工业卫生学家会议（ACGIH）采用了阈值-时间加权平均值（TLV）- TWA）为0.001 ppm，为0.007 mg/m 3. 短期暴露极限（STEL）为0.005 ppm或0.036 mg/m 3. 对于2,4–TDI或2,6–TDI，或2,4–和2,6–TDI的混合物 ( 10 ) . 美国劳工部职业安全与健康管理局（OSHA）的允许接触限值为0.02 ppm（V）或0.14 mg/m 3. 以2,4-TDI作为上限，0.005 ppm（V）或0.036 mg/m 3. 作为时间加权平均值 ( 11 ) . 5.4 监测与di相关的呼吸和其他问题 iso 氰酸盐和聚 iso 由于氰酸盐的灵敏度和低体积要求（15升），因此通过使用本试验方法来辅助氰酸盐。其采样时间短，与许多工业过程的持续时间相适应，其定量下限也适用于工作区域中经常发现的浓度。 5.5 与本试验方法相关的分离取样装置物理分离气体和气溶胶，允许 iso 获得两种物理状态下的氰酸盐浓度，从而有助于选择通风系统和个人防护。 5.6 本试验方法用于测量工作场所和环境空气中2,4-和2,6-TDI的气体浓度。

1.1 This test method covers the determination of gaseous 2,4-toluene di iso cyanate (2,4-TDI) and 2,6-toluene di iso cyanate (2,6-TDI) in air samples collected from workplace and ambient atmospheres. 1.2 Differential air sampling is performed with a segregating device. 2 The gaseous fraction is collected on a glass fiber filter (GFF) impregnated with 9-(N-methylaminomethyl) anthracene (MAMA). 1.3 The analysis of the gaseous fraction is performed with a high performance liquid chromatograph (HPLC) equipped with ultraviolet (UV) and fluorescence detectors. An ultra high performance liquid chromatograph (UPLC) can also be used, provided that its performance is equivalent to what is stated in this standard. 1.4 The analysis of the aerosol fraction is performed separately as described in Ref ( 1 ) . 3 1.5 The range of application of this test method, utilizing UV and a fluorescence detector, is validated for 0.014 to 1.16 μg of monomer 2,4- and 2,6-TDI/2.0 mL of desorption solution, which corresponds to concentrations of 0.001 to 0.077 mg/m 3 of TDI based on a 15-L air sample. This corresponds to 0.0.14 to 11 ppb(V) and brackets the established TLV value of 1 ppb(v). 1.6 A field blank sampling system is used to check the possibility of contamination during the entire sampling and analysis. 1.7 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.8 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. See Section 9 for additional hazards. 1.9 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 TDI is used mostly in the preparation of rigid and semi-rigid foams and adhesives. 5.2 Di iso cyanates and poly iso cyanates are irritants to skin, eyes, and mucous membranes. They are recognized to cause respiratory allergic sensitization, asthmatic bronchitis, and acute respiratory intoxication ( 6- 9 ) . 5.3 The American Conference of Governmental Industrial Hygienists (ACGIH) has adopted a Threshold Limit Value–Time Weighted Average (TLV-TWA) of 0.001 ppm of 0.007 mg/m 3 with a Short-Term Exposure Limit (STEL) of 0.005 ppm or 0.036 mg/m 3 for either 2,4–TDI, or 2,6–TDI, or for a mixture of 2,4– and 2,6–TDI ( 10 ) . The Occupational Safety and Health Administration of the U.S. Department of Labor (OSHA) has a permissible exposure limit of 0.02 ppm(V) or 0.14 mg/m 3 of 2,4-TDI as a ceiling limit and 0.005 ppm (V) or 0.036 mg/m 3 as a time-weighted average ( 11 ) . 5.4 Monitoring of respiratory and other problems related to di iso cyanates and poly iso cyanates is aided through the utilization of this test method, due to its sensitivity and low volume requirements (15 L). Its short sampling times are compatible with the duration of many industrial processes and its low quantification limit also suits the concentrations often found in the working area. 5.5 The segregating sampling device pertaining to this proposed test method physically separates gas and aerosol allowing iso cyanate concentrations in both physical states to be obtained, thus helping in the selection of ventilation systems and personal protection. 5.6 This test method is used to measure gaseous concentrations of 2,4- and 2,6-TDI in air for workplace and ambient atmospheres.