ISO 14507:2003规定了在测定有机污染物之前在实验室对土壤样品进行预处理的三种方法: 如果要测量挥发性有机化合物；如果要测量中度挥发性至非挥发性有机化合物，如果后续分析的结果必须准确且可重复，并且如果样品含有大于2mm的颗粒和/或污染物不均匀分布；如果要测量非挥发性有机化合物，并且提取程序规定了现场潮湿的样品，或者如果样品的最大颗粒小于2mm并且污染物均匀分布。如果准确度和重复性降低是可接受的，则该方法也适用。 ISO 14507中描述的预处理:2003与提取过程结合使用，其中污染物可用于提取液体。 注:为测定非挥发性无机化合物和土壤物理化学特性而对土壤样品进行预处理，见ISO 11464。

ISO 14507:2003 specifies three methods for the pretreatment of soil samples in the laboratory prior to the determination of organic contaminants:

• if volatile organic compounds are to be measured;
• if moderately volatile to non-volatile organic compounds are to be measured, if the result of the subsequent analysis must be accurate and reproducible, and if the sample contains particles larger than 2 mm and/or the contaminant is heterogeneously distributed;
• if non-volatile organic compounds are to be measured and the extraction procedure prescribes a field-moist sample, or if the largest particles of the sample are smaller than 2 mm and the contaminant is homogeneously distributed. This procedure is also applicable if reduced accuracy and repeatability are acceptable.

The pretreatment described in ISO 14507:2003 is used in combination with an extraction procedure in which the contaminant is available for the extraction liquid. NOTE For the pretreatment of soil samples for the purposes of determining non-volatile inorganic compounds and physico-chemical soil characteristics, see ISO 11464.