Animal and vegetable fats/other parameter detection

This standard specifies the method for determining the content of insoluble impurities in animal and plant fats. This standard is applicable to animal and vegetable fats. If soaps (especially calcium soaps) or oxidized fatty acids are not calculated as insoluble impurity content, different solvents and operating methods should be used to ensure that the determination of insoluble impurity content meets relevant requirements. 2 Normative References: The clauses in the following documents become clauses of this standard through reference in this standard. For dated reference documents, all subsequent amendments (excluding corrected content) or revisions are not applicable to this standard. However, parties to agreements based on this standard are encouraged to study whether the latest versions of these documents can be used. For undated references, the latest version applies to this standard. GB/T 15687 Preparation of Oil Samples (GB/T 15687-1995, eqv ISO 661:1989) 3 Terms and Definitions The following terms and definitions apply to this standard. 3.1 Insoluble impurities content refers to the amount of substances and foreign impurities that are insoluble in n-hexane or petroleum ether under the conditions specified in this standard. Note 1: The disc is represented by a mass fraction. Note 2: These impurities include mechanical impurities, minerals, carbohydrates, nitrogen-containing compounds, various resins, calcium soaps, oxidized fatty acids, fatty acid lactones and (partially) alkaline soaps, hydroxyl fatty acids and their glycerol esters, etc

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