GB/T 22460-2008 English PDF (GBT22460-2008)

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GB/T 22460-2008: Animal and vegetable fats and oils -- Determination of lovibond colour
GB/T 22460-2008
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 67.240
X 04
GB/T 22460-2008 / ISO 15305:1998
Animal and vegetable fats and oils -
Determination of Lovibond colour
(ISO 15305:1998 IDT)
ISSUED ON: NOVEMBER 04, 2008
IMPLEMENTED ON: JANUARY 01, 2009
Issued by: State Administration for Market Regulation;
Standardization Administration of the PRC.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Principle ... 4 
4 Apparatus ... 4 
4.1 Colorimeter ... 4 
4.2 Lighting cabinet ... 5 
4.3 Colour racks ... 6 
4.4 Spillage tray ... 6 
4.5 Glass cells ... 6 
5 Requirements for operators ... 6 
6 Sampling ... 6 
7 Preparation of test sample ... 7 
8 Procedure ... 7 
9 Expression of results ... 8 
10 Precision ... 8 
10.1 Interlaboratory test ... 8 
10.2 Repeatability ... 8 
10.3 Reproducibility ... 8 
11 Test report ... 9 
Annex A (informative) Results of an interlaboratory trial ... 10 
Bibliography ... 11 
Foreword
This standard equivalently adopts ISO 15305:1998 "Animal and vegetable fats
and oils - Determination of Lovibond colour" (English version).
For ease of use, this standard has also made the following editorial changes:
-- Delete the foreword of the international standard;
-- Change the term "this International Standard" to "this Standard";
-- Use decimal point "." to replace the comma "," in the original text, which
acts as a decimal point.
Compared with previous GB/T5525-1985 "Inspection of vegetable oils --
Methods for identification of transparency, colour, odour and taste", the main
changes of this standard are as follows:
-- For the Lovibond colorimeter method, ADD the method’s scope of
application, principle, operator requirements, sampling, sample
preparation, result presentation, precision, test report, and the applicable
instruments of this method;
-- DELETE the potassium dichromate solution colorimetry method. When
adopting to use the standard color-value series prepared by strong acid,
there are unsafe factors for this method. Due to the popularity of Lovibond
colorimeter method, the potassium dichromate solution colorimeter
method is no longer used in all oil and fat product standards.
Appendix A of this standard is informative.
This standard was proposed by the National Grain Administration.
This standard shall be under the jurisdiction of the National Cereals and Oils
Standardization Technical Committee.
Responsible drafting organizations of this standard: National Grain
Administration Research Institute, Henan University of Technology, Xi’an Oil
Research Institute of National Grain Administration.
The main drafters of this standard: Xue Yalin, Zhou Xianqing, Zhang Yurong,
Zhang Lei.
Animal and vegetable fats and oils -
Determination of Lovibond colour
1 Scope
This standard specifies the method for determination of Lovibond color for
animal and vegetable fats and oils.
This standard applies to the determination of the color of animal and vegetable
fats and oils.
2 Normative references
The clauses in the following documents have become the clauses of this
standard through the quotation in this standard. For dated reference documents,
all subsequent amendments (excluding corrigendum) or the revisions do not
apply to this standard. However, the parties are encouraged to reach an
agreement based on this standard to study if the latest version of these
documents can be used. For undated reference documents, the latest version
is applicable to this standard.
GB/T 15687 Oils and fats -- Preparation of test sample (GB/T 15687-1995,
eqv ISO 661:1989)
3 Principle
The colour of the light transmitted through a known path length of liquid fat or
oil is matched with the colour of the light originating from the same source
transmitted through glass colour standards. The results are conventionally
expressed in Lovibond units.
4 Apparatus
Usual laboratory apparatus and, in particular, the following.
4.1 Colorimeter
The Lovibond Universal tintometers Model F (BS684) and Model F/C are