1.1 该试验方法用于测定丙酮的总浓度， p -三氟氯甲苯（pCBTF）、乙酸甲酯或 t -乙酸丁酯（tBAc），或四种物质的组合，用于溶剂可还原和水可还原的油漆、涂料、树脂和原材料。由于与被测分析物或内标物共洗脱的未知化合物会导致错误的结果，因此该测试方法应仅用于已知成分的材料，以消除干扰的可能性。该测试方法的既定工作范围为每种分析物重量的1%至100%。 1.2 允许的豁免化合物因监管机构而异。始终核实当前的地方、州和联邦法规，以确保合规。 1.3 以国际单位制表示的值应被视为标准值。 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（如果有的话）。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。 1.5 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====== 4.1 由于需要计算涂料的挥发性有机物含量（VOC）， p -三氟氯甲苯、乙酸甲酯和 t -乙酸丁酯被认为可能豁免挥发性化合物，因此有必要了解这些分析物的含量。这种气相色谱测试方法提供了一种相对简单直接的方法来测定它们的含量。然而，由于该测试方法中使用的检测器没有选择性，并且由于一些涂层是非常复杂的混合物，因此样品中可能存在与分析物共溶的化合物，从而产生错误的高结果。或者，一种成分可能会用内标洗脱，从而产生错误的低结果。因此，了解样品的成分以确保在所使用的分析条件下没有干扰非常重要。试验方法 D6438 和 D6886 采用分析物的质谱检测，并可用作替代方法。

1.1 This test method is for the determination of the total-concentration of acetone, p -chlorobenzotrifluoride (pCBTF), methyl acetate, or t -butyl acetate (tBAc), or combination of any of the four, in solvent-reducible and water-reducible paints, coatings, resins, and raw materials. Because unknown compounds that co-elute with the analyte being measured or with the internal standard, will lead to erroneous results, this test method should only be used for materials of known composition so that the possibility of interferences can be eliminated. The established working range of this test method is from 1 % to 100 % for each analyte by weight. 1.2 Allowed exempt compounds vary by regulatory agency. Always verify current local, state, and federal rules and regulations to ensure compliance. 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 ====== 4.1 With the need to calculate volatile organic content (VOC) of paints, and with acetone, p -chlorobenzotrifluoride, methyl acetate and t -butyl acetate considered possible exempt volatile compounds, it is necessary to know the content of these analytes. This gas chromatographic test method provides a relatively simple and direct way to determine their content. However, because the detectors used in this test method are not selective, and because some coatings are very complex mixtures, compounds may be present in the sample that coelute with the analyte, giving a result that is erroneously high. Or a component may elute with the internal standard, giving a result that is erroneously low. It is therefore important to know the composition of the sample to ensure that there are no interferences, under the analysis conditions used. Test Methods D6438 and D6886 employ mass-spectral detection of analytes and may be used as alternative methods.