GB/T 5530-2005 in English

《GB/T 5530-2005动植物油脂 酸值和酸度测定》由TC270（全国粮油标准化技术委员会）归口，TC270SC2（全国粮油标准化技术委员会油料及油脂分会）执行，主管部门为国家粮食和物资储备局。
本标准规定了测定动植物油脂中酸度的方法(两种滴定法和一种电位计法)，酸度通常以酸值表示。本标准中热乙醇测定法为参考方法，冷溶剂法适用于浅色油脂。本标准不适用于蜡。

1 Scope

This standard specifies methods for the determination of acidity of animal and vegetable fats and oils (two titrimetric and one potentiometric) for the determination of acidity in animal and vegetable fats and oils. The acidity is expressed preferably as acid value.
The hot ethanol determination method is the reference method. The cold solvent method described is applicable to light-color fats and oils.
The methods are not applicable to waxes.

2 Normative References

The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments to (excluding amending errors in the text), or revisions of, any of these publications do not apply. However, all parties coming to an agreement according to this standard are encouraged to study whether the latest edition of the normative document is applicable. For undated references, the latest edition of the normative document applies.
GB/T 6682-1992 Water for Laboratory Use; Specifications (neq ISO 3696:1987)
GB/T 15687 Oils and Fats - Preparation of Test Sample (GB/T 15687-1995, eqv ISO 661:1989)

3 Terms and Definitions

For the purposes of this International Standard, the following terms and definitions apply.
3.1
Acid value
Number of milligrams of potassium hydroxide required to neutralize the free fatty acids present in 1g of oil and fat, when determined in accordance with the method specified in this standard; it is expressed in milligrams per gram.
3.2
Acidity
Content of free fatty acids determined according to the method specified in this standard, which is expressed as a percentage by mass.

Foreword II
1 Scope
2 Normative References
3 Terms and Definitions
4 Hot Ethanol Method Using Indicator
4.1 General
4.2 Principle
4.3 Reagents
4.4 Apparatus
4.5 Sampling
4.6 Preparation of Test Sample
4.7 Procedure Portion
5 Cold Solvent Method
5.1 General
5.2 Principle
5.3 Reagents
5.4 Apparatus
5.5 Sampling
5.6 Preparation of Test Sample
5.7 Procedure
6 Potentiometric Method
6.1 Principle
6.2 Reagents
6.3 Apparatus
6.4 Sampling
6.5 Preparation of Sample
6.6 Procedure
7 Calculation
7.1 Acid Value
7.2 Acidity
8 Precision
8.1 Repeatability
8.2 Reproducibility
9 Test report
Annex A (Informative) Results of Interlaboratory Tests
Bibliography