1.1 本试验方法包括通过液相色谱法（LC）直接注射和串联质谱法（MS/MS）检测测定海水中的二丙二醇单丁醚（DPGBE）和乙二醇单丁醚（EGBE）。这些分析物通过该试验方法进行定性和定量测定。该测试方法遵循选择性反应监测（SRM）质谱法。 1.2 DPGBE和EGBE的检测验证级别（DVL）和报告范围列于 表1 . 1.2.1 DVL的浓度要求至少是报告限值（RL）的3倍，并且信噪比大于3: 1. 图1 和 图2 显示单反应监测（SRM）转变的信噪比。 图1 检测验证电平信噪比 图2 报告水平（校准标准）信噪比 1.2.2 报告限值是DPGBE和EGBE的1级校准标准的浓度，如表4所示，考虑到20%的样品制备稀释系数。 1.3 以国际单位制表示的数值应视为标准。本标准不包括其他计量单位。 1.4 本标准并不旨在解决与其使用相关的所有安全问题（如有）。 本标准的使用者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》中确立的国际公认的标准化原则制定的。 ====意义和用途====== 5.1 DPGBE和EGBE具有多种住宅和工业应用，如清洁配方、表面涂料、油墨和化妆品。 这些分析物可能以对水生生物有害的水平释放到环境中。 5.2 该测试方法已被研究用于试剂和海水。

1.1 This test method covers the determination of dipropylene glycol monobutyl ether (DPGBE) and ethylene glycol monobutyl ether (EGBE) in sea water by direct injection using liquid chromatography (LC) and detection with tandem mass spectrometry (MS/MS). These analytes are qualitatively and quantitatively determined by this test method. This test method adheres to selected reaction monitoring (SRM) mass spectrometry. 1.2 The detection verification level (DVL) and reporting range for DPGBE and EGBE are listed in Table 1 . 1.2.1 The DVL is required to be at a concentration at least 3 times below the reporting limit (RL) and have a signal/noise ratio greater than 3:1. Fig. 1 and Fig. 2 display the signal/noise ratio of the single reaction monitoring (SRM) transition. FIG. 1 Detection Verification Level Signal/Noise Ratio FIG. 2 Reporting Level (Calibration Standard) Signal/Noise Ratio 1.2.2 The reporting limit is the concentration of the Level 1 calibration standard as shown in Table 4 for DPGBE and EGBE, taking into account the 20 % sample preparation dilution factor. 1.3 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 DPGBE and EGBE have a variety of residential and industrial applications such as cleaning formulations, surface coatings, inks, and cosmetics. These analytes may be released into the environment at levels that may be harmful to aquatic life. 5.2 This test method has been investigated for use with reagent and sea water.