1.1 本试验方法包括气相色谱法测定成品发动机和航空火花点火燃料中苯和甲苯的液体体积百分比。本试验方法有两个步骤:步骤A采用毛细管柱气相色谱法，步骤B采用填充柱气相色谱法。程序A和B具有不同的精密度。 1.2 该方法已使用 D6300 -符合要求的实验室间研究（ILS），最低和最高ILS样本浓度平均值如下:（ 1 ）程序A在0.12%至5.2%体积之间和（ 2 )程序B在0.10%至5.0%体积之间。 1.3 该方法已使用 D6300 -符合要求的实验室间研究（ILS），最低和最高ILS样本浓度平均值如下:( 1 )程序A在0.4%至19.7%体积之间，和( 2 ）程序B在2.0%至20.0%体积之间。 1.4 对于报告，根据实践，本试验方法程序A中苯和甲苯的最低和最高浓度范围 D6300 看 13.2 . 1.5 对于报告，根据实践，本试验方法程序B中苯和甲苯的最低和最高浓度范围 D6300 看 24.2 . 1.6 对于程序A中的苯，以下含氧燃料包括在工作范围内:（ 1 )至多20体积%的乙醇(E20)；( 2 )甲醇至10体积%(M10)。不包括燃料M85和E85。 1.7 对于程序B中的苯，以下含氧燃料包括在工作范围内:（ 1 )至多20体积%的乙醇(E20)；( 2 )甲醇至10体积%(M10)。不包括燃料M85和E85。 1.8 对于通过程序A的甲苯，工作范围包括以下含氧燃料:（ 1 )至多20体积%的乙醇(E20)；( 2 )M85和E85。 1.9 对于程序B中的甲苯，以下含氧燃料包括在工作范围内:（ 1 )至多20体积%的乙醇(E20)；( 2 )M85和E85。 1.10 方法A使用MIBK作为内标。程序B用途 sec -丁醇作为内标。对含有混合丁醇的燃料使用程序B要求 sec -燃料中的丁醇低于检测限 sec -丁醇是内标。对于程序B，附件中描述的替代分离柱组（ A2.3 当丁醇可以掺入汽油中时，附件方法B)使用MEK作为内标。1.11 本试验方法包括基于实践的苯的方法间偏差部分 D6708 测试方法之间的偏倚评估 D3606 程序B和试验方法 D5769 旨在允许测试方法 D3606 将程序B用作试验方法的可能替代方法 D5769 .实践 D6708 推导的苯相关方程适用于检测方法报告的0.06%至2.76%体积范围内的苯测量 D3606 程序B（见 26.2.1 ).该相关性符合EPA基于性能的测量系统(PBMS)。 1.12 相关方程包含在测试方法之间的偏差章节中 14.2.1 将程序A中苯和甲苯的体积百分比值转换为程序B。这些相关性适用于0的浓度范围。苯为07%至5.96体积%，甲苯为0.36体积%至20.64体积%，如程序A所报告。 1.13 以SI单位表示的值将被视为标准值。括号中给出的值仅供参考。 1.14 本标准并不旨在解决与其使用相关的所有安全性问题（如果有）。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法规限制的适用性。 1.15 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》中确立的国际公认的标准化原则制定的。======意义和用途====== 5.1 对于调节用途、汽油混合控制和/或工艺优化，可能需要了解苯的浓度。

1.1 This test method covers the quantitation in liquid volume percent of benzene and toluene in finished motor and aviation spark ignition fuels by gas chromatography. This test method has two procedures: Procedure A uses capillary column gas chromatography and Procedure B uses packed column gas chromatography. Procedures A and B have separate precisions. 1.2 The method has been evaluated for benzene using a D6300 -compliant Interlaboratory Study (ILS), with the lowest and highest ILS sample concentration means as follows: ( 1 ) Procedure A between 0.12 % and 5.2 % by volume and ( 2 ) Procedure B between 0.10 % and 5.0 % by volume. 1.3 The method has been evaluated for toluene using a D6300 -compliant Interlaboratory Study (ILS), with the lowest and highest ILS sample concentration means as follows: ( 1 ) Procedure A between 0.4 % and 19.7 % by volume, and ( 2 ) Procedure B between 2.0 % and 20.0 % by volume. 1.4 For reporting, the lowest and highest concentration ranges for benzene and toluene for Procedure A of this test method per Practice D6300 see 13.2 . 1.5 For reporting, the lowest and highest concentration ranges for benzene and toluene for Procedure B of this test method per Practice D6300 see 24.2 . 1.6 For benzene by Procedure A, the following oxygenated fuels are included in the working range: ( 1 ) ethanol up to 20 % by volume (E20); ( 2 ) methanol up to 10 % by volume (M10). Fuels M85 and E85 were excluded. 1.7 For benzene by Procedure B the following oxygenated fuels are included in the working range: ( 1 ) ethanol up to 20 % by volume (E20); ( 2 ) methanol up to 10 % by volume (M10). Fuels M85 and E85 were excluded. 1.8 For toluene by Procedure A the following oxygenated fuels were included in the working range: ( 1 ) ethanol up to 20 % by volume (E20); ( 2 ) M85 and E85. 1.9 For toluene by Procedure B the following oxygenated fuels are included in the working range: ( 1 ) ethanol up to 20 % by volume (E20); ( 2 ) M85 and E85. 1.10 Procedure A uses MIBK as the internal standard. Procedure B uses sec -butanol as the internal standard. The use of Procedure B for fuels containing blended butanols requires that sec -butanol be below the detection limit in the fuels as sec -butanol is an internal standard. For Procedure B, an alternative separation column set described in the annex ( A2.3 , Annex Approach B) uses MEK as the internal standard when butanols may be blended into gasolines. 1.11 This test method includes a between method bias section for benzene based on Practice D6708 bias assessment between Test Method D3606 Procedure B and Test Method D5769 . It is intended to allow Test Method D3606 Procedure B to be used as a possible alternative to Test Method D5769 . The Practice D6708 derived benzene correlation equation is applicable for benzene measurements in the reportable range from 0.06 % to 2.76 % by volume as reported by Test Method D3606 Procedure B (see 26.2.1 ). The correlation complies with EPA’s Performance Based Measurement System (PBMS). 1.12 Correlation equations are included in the between test methods bias section 14.2.1 of Procedure A to convert Procedure A to the Procedure B volume percent values for benzene and toluene. The correlations are applicable in the concentration ranges of 0.07 % to 5.96 % by volume for benzene and 0.36 % to 20.64 % by volume for toluene as reported by Procedure A. 1.13 The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only. 1.14 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. 1.15 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 Knowledge of the concentration of benzene may be required for regulatory use, control of gasoline blending, and/or process optimizations.