ISO 16720:2005规定了通过冷冻干燥对土壤样品进行预处理以进行后续分析的方法。 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不易挥发的元素或有机化合物。通常，ISO 16720:2005也适用于淤泥和沉积物的样品。 该方法也适用于测定干物质（或水）含量的第一步，例如在高含水量样品的情况下。

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.