ISO 4048-2018 皮革--化学试验--二氯甲烷中可溶物质和游离脂肪酸含量的测定 Leather--Chemical tests--Determination of matter soluble in dichloromethane and free fatty acid content

This document specifies a method for the determination of the substances in leather which are soluble 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 part soluble and partly bound to the leather. On the other hand, the solvent can dissolve non-fatty substances, for example sulfur and impregnants, both of which cause difficulty in the determination of the acid value and saponification value of the fat.
This document includes two techniques for extraction of the fatty substances: 1) extraction using the 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 the leather, 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 other than dichloromethane (although the temperature conditions may need to be varied for high pressure extraction).rd edition 2018-06 Leather — Chemical tests — Determination of matter soluble in dichloromethane and free fatty acid content Cuir — Essais chimiques — Dosage des matières solubles dans le dichlorométhane et des acides gras libres Reference numbers ISO 4048:2018(E) IULTCS/IUC 4:2018(E) ？ ISO 2018 ISO 4048:2018(E) IULTCS/IUC 4: 标准截图