1.1 本程序包括使用加压流体萃取（PFE）测定土壤中的硫代二甘醇（TDG）。商用PFE系统 2. 然后使用液相色谱（LC）进行分析，并使用串联质谱（MS/MS）进行检测。通过该方法定性和定量测定TDG。该方法遵循单反应监测（SRM）质谱法。 1.2 TDG的方法检测限（MDL）和报告范围如所示 表1 . 1.2.1 MDL根据联邦法规40 CFR第136部分附录B确定。 1.2.2 报告限值（RL）根据1级校准标准的浓度计算，如表4所示。 该方法的RL为200 ppb。根据表4浓度计算报告范围浓度，假设注入5μL最低水平校准标准、5 g样品和2 mL最终提取物体积。 1.3 单位- 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。 1.4 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。 1.5 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 TDG是《化学武器公约》下的附表2化合物。附表2化学品包括化学武器前体、化学武器制剂或具有许多其他商业用途的化学品。它们被用作生产杀虫剂、除草剂、润滑剂和一些医药产品的原料。附表2化学品可在与化学武器无关的应用中找到。TDG既是芥子气前体，也是降解剂，也是水基油墨、圆珠笔油墨、染料和一些农药的成分。 5. 5.2 该方法已用于土壤。

1.1 This procedure covers the determination of thiodiglycol (TDG) in soil using pressurized fluid extraction (PFE). A commercially available PFE system 2 is used, followed by analysis using liquid chromatography (LC), and detected with tandem mass spectrometry (MS/MS). TDG is qualitatively and quantitatively determined by this method. This method adheres to single reaction monitoring (SRM) mass spectrometry. 1.2 The method detection limit (MDL) and reporting range for TDG are listed in Table 1 . 1.2.1 The MDL is determined following the Code of Federal Regulations, 40 CFR Part 136, Appendix B. 1.2.2 The reporting limit (RL) is calculated from the concentration of the Level 1 calibration standard as shown in Table 4. The RL for this method is 200 ppb. Reporting range concentrations are calculated from Table 4 concentrations assuming a 5 μL injection of the lowest level calibration standard, 5 g sample, and a 2 mL final extract volume. 1.3 Units— The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.4 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. 1.5 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 TDG is a Schedule 2 compound under the Chemical Weapons Convention (CWC). Schedule 2 chemicals include those that are precursors to chemical weapons, chemical weapons agents, or have a number of other commercial uses. They are used as ingredients to produce insecticides, herbicides, lubricants, and some pharmaceutical products. Schedule 2 chemicals can be found in applications unrelated to chemical weapons. TDG is both a mustard gas precursor and a degradant as well as an ingredient in water-based inks, ballpoint pen inks, dyes, and some pesticides. 5 5.2 This method has been investigated for use with soil.