GSO ISO 4048:2014
皮革化学试验二氯甲烷中可溶物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

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标准号

GSO ISO 4048:2014

发布

2014年

发布单位

GSO

当前最新

GSO ISO 4048:2014

 

 

适用范围

This International Standard 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, e.g. sulfur and impregnants, both of which cause difficulty in the determination of the acid value and saponification value of the fat. This International Standard 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).

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