GB/T 15688-2024Animal and vegetable fats and oils - Determination of insoluble impurities content (English PDF)

Foreword

This document was drafted in accordance with the provisions of GB/T 1.1-2020

"Directives for standardization - Part 1.Rules for the structure and drafting of

standardizing documents".

This document replaces GB/T 15688-2008 "Animal and vegetable fats and oils -

Determination of insoluble impurities content". Compared with GB/T 15688-2008, in

addition to structural adjustments and editorial changes, the main technical content

changes are as follows.

a) ADD the inapplicable scope (see Clause 1).

This document is identical to ISO 663.2017 "Animal and vegetable fats and oils -

Determination of insoluble impurities content".

Attention is drawn to the possibility that some of the elements of this document may be

the subject of patent rights. The issuing authority of this document shall not be held

responsible for identifying any or all such patent rights.

This document was proposed by National Food and Strategic Reserves Administration.

This document shall be under the jurisdiction of National Technical Committee on

Grain and Oil of Standardization Administration of China (SAC/TC 270).

Drafting organizations of this document. Wuhan Institute of Standardization, Wuhan

Institute for Food and Cosmetic Control, Wuhan University of Light Industry, Yihai

Kerry Arawana Holdings Co., Ltd., Gansu Institute of Standardization.

Main drafters of this document. Huang Yong, Jiang Xiaoming, Huang Qing, Zhang

Sihong, Wang Geping, Yang Yi, Fang Weixing, Ren Wenjing, Yang Yong, Xiang

Xiaoxue, Xiao Ronghui.

The previous released versions replaced by this document are as follows.

- first published in 1995 as GB/T 15688-1995, first revised in 2008;

- this is the second revision.

Animal and vegetable fats and oils - Determination of

insoluble impurities content

1 Scope

This document describes the method for determination of insoluble impurities content

in animal and vegetable fats and oils.

2 Normative references

The following referenced documents are indispensable for the application of this

document. For dated references, only the edition cited applies. For undated references,

the latest edition of the referenced document (including any amendments) applies.

ISO 661 Animal and vegetable fats and oils - Preparation of test sample

3 Terms and definitions

For the purpose of this document, the following terms and definitions apply.

Quantity of substances and foreign impurities that are insoluble in n-hexane or light

petroleum under the conditions specified in this document.

4 Principle

Dissolve the specimen in excess n-hexane or light petroleum and filter the solution

obtained. Rinse the residue and filter paper with the same solvent and dry them to

constant weight at 103 °C.

5 Reagents

WARNING -- The operating rules for handling dangerous goods shall be adopted

and various technical, organizational and personal safety measures shall be

followed.

6 Apparatus

Crucible filter. glass, of grade P16 (pore size 10 µm ~ 16 µm), diameter 40 mm, of

capacity 50 mL, with a suction bottle. It can be used in place of the filter described in

7 Sampling

The sample received by the laboratory should be representative and shall not be

damaged or changed during transportation or storage. Sampling is not covered by this

document and shall be done in accordance with ISO 5555.

8 Preparation of specimen

Prepare the specimen according to ISO 661.

9 Operating procedure

In a conical flask (6.3), weigh approximately 20 g of the specimen (Clause 8), to the

nearest 0.01 g.

Put the crucible filter coated with kieselguhr in the electric drying oven (6.2), dry it in

the electric drying oven at a temperature of 103 °C for 1 h, then transfer it to a desiccator

(6.4) to cool and weigh to the nearest 0.001 g.

Carry out two determinations on the same specimen (Clause 8) twice according to the

above method.

10 Expression of results

The insoluble impurities content w (expressed as mass fraction) in the specimen is

calculated according to formula (1).

where.

11 Precision

Annex A summarizes the interlaboratory tests on the precision of this method. The

values obtained from these tests may not be applicable to other concentration ranges

and other test objects.

12 Test report

The test report shall contain in detail.

Annex A

(informative)

Inte-laboratory test results

The Federation of Oils, Seeds and Fats Associations (FOSFA) has organized several

laboratories to determine the insoluble impurities in palm oil, crude palm oil and palm

kernel oil according to ISO 5725-2.

......