1.1 本规程是一种筛选程序，用于评估土壤中是否存在含有芳香化合物的燃料。如果有污染燃料的样本，可以确定土壤中燃料的浓度。如果污染物燃料类型已知，但污染物燃料的样品不可用，则可以使用基于土壤中燃料成分的平均响应因子来估计土壤中燃料的浓度。如果污染燃料的种类未知，则可以使用这种筛选方法来识别污染的存在。 1.2 以国际单位制表示的数值应视为标准。本标准中不包括其他计量单位。 1.3 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。 1.4 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 本规程是一种筛选程序，用于确定土壤中是否存在含有芳香化合物的燃料。如果污染燃料的样品可用于校准，则可以计算土壤中燃料的近似浓度。如果燃料类型已知，但污染物燃料的样本无法用于校准，则可以使用基于土壤中燃料成分的平均响应因子来计算污染物燃料浓度的估计值。 如果污染物燃料的成分未知，则无法计算污染物浓度，并且这种做法只能用于指示燃料污染的存在或不存在。 5.2 含有芳香族化合物的燃料，如柴油和汽油，以及其他含有芳香族的碳氢化合物材料，如原油、煤油和机油，可以通过这种做法来确定。柴油燃料的定量限值约为75 mg/kg。可通过该筛选实践确定的其他含芳香烃材料的近似定量限值见 表1 .高脂族材料（如航空汽油和合成机油）的定量限值远高于芳香族物质（如煤和柴油）的定量极限值。 注1: 中列出的定量限值 表1 是估计值，因为在这种实践中，定量限可能受到特定燃料类型和土壤背景的影响。有关中给出的值如何 表1 已确定，请参阅 附录X1 .本筛选实践制定过程中产生的数据以及与本实践相关的其他信息可在参考研究报告中找到 ( 1. ， 2. ) 。 3. 5.3 当将此做法应用于受柴油污染的现场时，应注意从中给出的列表中选择适当的响应系数 表2 ，考虑燃料污染是否新鲜或是否经过风化或生物降解过程。看见 附录X2 。 5.4 使用这种做法时要考虑的是污染是否是一种或多种燃料类型的混合物。如果是这种情况，则特定地点的响应系数（参见 X2.3 )如果无法确定，则应使用混合物中单个燃料类型的响应系数来估计污染物浓度。 5.5 某些材料，如沥青和沥青残留物，以及来自树木和其他植被的油和沥青，在实践测试时作为燃料产生反应，会产生高的空白吸光度值，这可能会干扰本实践的使用。看见 8.1.2.1 和 注3 有关确定该做法是否适用于含有一种或多种此类材料的特定土壤的信息。 5.6 可提取材料散射或吸收254nm的光，是这种筛选实践的潜在干扰。

1.1 This practice is a screening procedure for assessing the presence of fuels containing aromatic compounds in soils. If a sample of the contaminant fuel is available, the concentration of the fuel in the soil can be determined. If the contaminant fuel type is known but a sample of the contaminant fuel is not available, an estimate of the concentration of the fuel in the soil can be made using average response factors based on composition of the fuel in the soil. If the kind of contaminant fuel is unknown, this screening method can be used to identify the presence of contamination. 1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.3 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. 1.4 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 This practice is a screening procedure for determining the presence of fuels containing aromatic compounds in soils. If a sample of the contaminant fuel is available for use in calibration, the approximate concentration of the fuel in the soil can be calculated. If the fuel type is known but a sample of the contaminant fuel is not available for calibration, an estimate of the contaminant fuel concentration can be calculated using average response factors based on composition of the fuel in the soil. If the composition of the contaminant fuel is unknown, a contaminant concentration cannot be calculated, and this practice can only be used only to indicate the presence or absence of fuel contamination. 5.2 Fuels containing aromatic compounds, such as diesel fuel and gasoline, as well as other aromatic-containing hydrocarbon materials, such as crude oil, coal oil, and motor oil, can be determined by this practice. The quantitation limit for diesel fuel is about 75 mg/kg. Approximate quantitation limits for other aromatic-containing hydrocarbon materials that can be determined by this screening practice are given in Table 1 . Quantitation limits for highly aliphatic materials, such as aviation gasoline and synthetic motor oil, are much higher than those for more aromatic materials, such as coal oil and diesel fuel. Note 1: The quantitation limits listed in Table 1 are estimated values because in this practice, the quantitation limit can be influenced by the particular fuel type and soil background. For information on how the values given in Table 1 were determined, see Appendix X1 . Data generated during the development of this screening practice and other information pertaining to this practice can be found in the referenced research reports ( 1 , 2 ) . 3 5.3 When applying this practice to sites contaminated by diesel fuel, care should be taken in selecting the appropriate response factor from the list given in Table 2 , with consideration given to whether or not the fuel contamination is fresh or has undergone weathering or biodegradation processes. See Appendix X2 . 5.4 A consideration in using this practice is whether the contamination is a mixture of one or more fuel types. If this is the case, and a site-specific response factor (see X2.3 ) cannot be determined, the response factors for the individual fuel types in the mixture should be used to estimate contaminant concentrations. 5.5 Certain materials, such as asphalts and asphalt residuals and oils and pitch from trees and other vegetation, which respond as fuel when tested by the practice, give high blank absorbance values which may interfere with use of this practice. See 8.1.2.1 and Note 3 for information on determining if this practice can be applied to a specific soil containing one or more of these types of materials. 5.6 Extractable material, which scatters or absorbs light at 254 nm, is a potential interference for this screening practice.