土质.测定有机污物用试样的预处理

[中文适用范围]： 本国际标准规定了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； ——如果要测量中等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 2 毫米的颗粒和/或污染物分布不均匀； ——如果要测量非挥发性有机化合物并且提取程序规定使用现场潮湿的样品，或者如果样品的最大颗粒小于 2 毫米并且污染物分布均匀。 如果可以接受降低的精度和重复性，则该程序也适用。 本国际标准中描述的预处理与萃取程序结合使用，其中污染物可用于萃取液。 注：为了确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，请参见 ISO 11464。 [外文原描述]： 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.