ISO 4098 |IULTCS/IUC 6:2018规定了水溶性物质、水溶性无机物和水溶性有机物的测定方法。 ISO 4098 | IULTCS/IUC 6:2018适用于所有皮革类型。该分析得出的结果取决于以下因素: -皮革的研磨程度； -萃取温度； -提取期； -皮革与水的比例。 因此，为了获得可比结果，必须准确再现试验条件。 在所有情况下，滤液中的任何铵盐都是水溶性物质的一部分，然后在点火时分解。因此，它们有助于获得水溶性有机物。如果需要，可以在滤液中单独测定铵盐的浓度。

ISO 4098 | IULTCS/IUC 6:2018 specifies a method of determination of water-soluble matter, water-soluble inorganic matter and water-soluble organic matter. ISO 4098 | IULTCS/IUC 6:2018 is applicable to all leather types. The result obtained by this analysis depends on factors such as: - the degree to which the leather is ground; - the extraction temperature; - the extraction period; - the ratio of leather to water. To obtain comparable results, it is consequently imperative that test conditions be accurately reproduced. In all cases, any ammonium salts in the filtrate are included as part of the water-soluble matter and are then decomposed on ignition. Thus they contribute towards the result for water-soluble organic substances. The concentration of the ammonium salts can be determined in the filtrate separately if required.