ISO 16720:2005规定了通过冷冻干燥对土壤样品进行预处理的方法进行后续分析。 ISO 16720:2005适用于土壤样品，用于随后测定在冷冻干燥条件下被认为是非挥发性的元素或有机化合物。通常，ISO 16720:2005也可以应用于污泥和沉积物的样品。 该方法也可用作测定干物质（或水）含量的第一步骤，例如在含水量高的样品的情况下

ISO 16720:2005 specifies a method for pretreatment of soil samples by freeze-drying for subsequent analysis. ISO 16720:2005 is applicable to soil samples for subsequent determination of elements or organic compounds recognized as non-volatile under freeze-drying conditions. Generally, ISO 16720:2005 can also be applied to samples from sludges and sediments. This method is also applicable as a first step for the determination of dry matter (or water) content, for instance in the case of samples with high water content.