1.1 本规程描述了通过索氏提取法测定在需要高清洁度的硬件（例如用于氧气服务的部件）内使用或与之接触的材料中残留污染物的程序。 1.2 本规程可用于从固体中提取非挥发性和半挥发性残留物，如新的和使用过的手套、新的和用过的擦拭器、受污染的试样或对照试样、小块零件（金属或非金属）等。当与拟定的消耗品清洁材料（擦拭器、手套等）一起使用时，该实践可用于确定所提出的溶剂从清洁材料中提取污染物（增塑剂、残留洗涤剂、增白剂等）并将其沉积在被清洁表面上的可能性。 1.3 本规程不适用于微粒污染的评估。 1.4 以SI单位表示的值为标准值。 1.5 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建立适当的安全、健康和环境实践，并确定监管限制的适用性。 1.6 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《国际标准、指南和建议制定原则决定》中确立的国际公认标准化原则制定的。 =====意义和用途====== 5.1 预计本规程将适用于识别和量化在系统、系统材料和需要高清洁度的系统中使用的部件（如氧气服务部件）中发现的污染物。 非金属件零件，如密封件和阀座，可在收到时进行测试。 警告- 如果被测试的零件随后将安装在富氧系统中，由于干燥不足而残留在零件中的残余提取溶剂可能会增加系统的点火敏感性。使用前，应彻底清除零件上的萃取溶剂。 5.2 可在使用前评估用于清洁操作的处理材料，例如手套和擦拭器或其样品，以确保所提出的清洁溶剂不会提取可能作为残留物沉积在待清洁表面上的污染物。 注1: 不需要索氏设备的试验方法，如试验方法 1560年 和 1731年 ，可以是评估加工材料的合适替代品。试验方法 第144页 带着练习 第136页 可适用于待测试材料未通过超声降解时使用。然而，该测试方法的结果不能与其他测试方法的测试结果直接比较。索氏提取可能比其他提取方法更具侵略性。 5.3 擦拭器或其他清洁用品可以在使用前后进行测试，以确定从表面去除的污染物量。从表面去除的污染物的类型也可以通过使用诸如傅里叶变换红外（FTIR）的分析方法对提取的NVR进行定性分析来确定。该程序可用于使用经过清洁过程的受污染对照试样作为验证清洁操作的对照，获得用于NVR分析的样品。 5.4 溶剂的选择需要对污染物有一定的了解（参见实践 第93页 建议）。如果要对分子污染物进行非挥发性残留物（NVR）分析，溶剂的沸点应明显低于污染物的沸点。对于其他分析方法，测试人员必须知道分析方法的准确性，并且溶剂的选择应避免干扰所选的分析方法。为了确定NVR的组成，已经令人满意地使用了红外光谱或气相色谱/质谱等分析方法。

1.1 This practice describes a procedure for the determination of residual contamination in materials to be used within or in contact with hardware requiring a high level of cleanliness, such as components for oxygen service, by Soxhlet extraction. 1.2 This practice may be used for extracting nonvolatile and semivolatile residues from solids such as new and used gloves, new and used wipers, contaminated test specimens or control coupons, small piece parts (metallic or nonmetallic), etc. When used with proposed consumable cleaning materials (wipers, gloves, etc.), this practice may be used to determine the potential of the proposed solvent to extract contaminants (plasticizers, residual detergents, brighteners, etc.) from the cleaning material and deposit them on the surface being cleaned. 1.3 This practice is not suitable for the evaluation of particulate contamination. 1.4 The values stated in SI units are standard. 1.5 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. 1.6 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 It is expected that this practice will be suitable to identify and quantify contaminants found in systems, system materials, and components used in systems requiring a high level of cleanliness, such as components for oxygen service. Nonmetallic piece parts such as seals and valve seats can be tested as received. Warning— If parts being tested are to be subsequently installed in an oxygen-enriched system, residual extraction solvent remaining in the part due to inadequate drying may increase the susceptibility of the system to ignition. The extraction solvent shall be thoroughly removed from the parts prior to service. 5.2 Processing materials such as gloves and wipers, or samples thereof, to be used in the cleaning operation can be evaluated prior to use to ensure that the proposed cleaning solvent does not extract contaminants that may be deposited as residues on the surface to be cleaned. Note 1: Test methods that do not require Soxhlet equipment, such as Test Methods E1560 and E1731 , may be suitable alternatives for evaluation of processing materials. Test Method G144 with Practice G136 may be suitable for use when the material to be tested is not degraded by sonication. However, results from this test method cannot be directly compared to results from other test methods. Soxhlet extraction may be more aggressive than other extraction methods. 5.3 Wipers or other cleaning supplies can be tested before and after use to determine the amount of contaminant removed from a surface. The type of contaminant removed from the surface may also be determined by qualitative analysis of the extracted NVR using analytical methods such as Fourier Transform Infrared (FTIR). This procedure can be used to obtain samples for NVR analysis using contaminated control coupons that were subjected to the cleaning process as controls to validate cleaning operations. 5.4 The selection of the solvent requires some knowledge of the contaminant (see Practice G93 for recommendations). If a nonvolatile residue (NVR) analysis is to be performed on the molecular contaminant, the boiling point of the solvent shall be significantly lower than that of the contaminant. For other analytical methods, the tester must know the accuracy of the analytical methods, and the solvent shall be chosen so as not to interfere with the selected analytical method. To identify the composition of the NVR, analytical methods such as infrared spectroscopy or gas chromatography/mass spectroscopy have been used satisfactorily.