ISO 4048-2008 皮革.化学试验.可溶于二氯甲烷和游离脂肪酸的物质的测定

标准号：ISO 4048-2008
中文标准名称：皮革.化学试验.可溶于二氯甲烷和游离脂肪酸的物质的测定
英文标准名称：Leather - Chemical tests - Determination of matter soluble in dichloromethane and free fatty acid content
标准类型：Y45
发布日期：1999/12/31 12:00:00
实施日期：1999/12/31 12:00:00
中国标准分类号：Y45
国际标准分类号：59.140.30
引用标准：ISO 2418;ISO 4044;ISO 4098;ISO 4684
适用范围：This International Standard specifies a method for the determination of the substances in leather which aresoluble in dichloromethane. This method is applicable to all types of leather.Not all fatty and similar substances can be extracted from leather with organic solvents; they may be in partsoluble and partly bound to the leather. On the other hand, the solvent can dissolve non-fatty substances, e.g.sulfur and impregnants, both of which cause difficulty in the determination of the acid value and saponificationvalue of the fat.This International Standard includes two techniques for extraction of the fatty substances: 1) extraction usingthe Soxhlet apparatus; and 2) extraction using a pressurized extraction system.As the extraction is frequently done in conjunction with determination of the free fatty acid content of theleather, a suitable procedure for determination of the free fatty acids extracted by this method is included.The apparatus and technique described in this method are also suitable for the extraction by solvents otherthan dichloromethane (although the temperature conditions may need to be varied for high pressureextraction).