GB 5009.236-2016 PDF English
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GB 5009.236-2016: Animal and vegetable fats and oils -- Determination of moisture and volatile matter content
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GB5009.236-2016
NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA National Food Safety Standard - Animal and Vegetable Fats and Oils - Determination of Moisture and Volatile Matter Issued on. AUGUST 31, 2016 Implemented on. MARCH 1, 2017 Issued by. National Health and Family Planning Commission of the People’s Republic of China
Table of Contents
Foreword... 3 1 Scope... 4 Method I -- Sand Bath (electric heating plate) Method... 4 2 Principle... 4 3 Instruments and Equipment... 4 4 Analytical Procedures... 4 5 Expression of Analytical Result... 5 6 Precision... 6 Method II -- Electric Drying Oven Method... 6 7 Principle... 6 8 Instruments and Equipment... 6 9 Analytical Procedures... 6 10 Expression of Analytical Result... 7 11 Precision... 7Foreword
This Standard serves as a replacement of GB/T 9696-2008 Animal and Vegetable Fats and Oils - Determination of Moisture and Volatile Matter Content; GB/T 5528-2008 Animal and Vegetable Fats and Oils - Determination of Moisture and Volatile Matter Content. In comparison with GB/T 9696-2008 and GB/T 5528-2008, there are certain main changes as follows. ---The title of this Standard is modified into “National Food Safety Standard - Animal and Vegetable Fats and Oils - Determination of Moisture and Volatile Matter”; ---This Standard combines methods in GB/T 9696-2008 and GB/T 5528-2008. National Food Safety Standard - Animal and Vegetable Fats and Oils - Determination of Moisture and Volatile Matter1 Scope
This Standard specifies two methods for the determination of moisture and volatile matter in animal and vegetable fats and oils. In this Standard, Method I [sand bath (electric heating plate) method] is applicable to all animal and vegetable fats and oils. Method II (electric drying oven method) is merely applicable to non-dry fats and oils whose acid value is lower than 4 mg/g; it is not applicable to lauric acid type of oils (palm kernel oil and coconut oil). Method I -- Sand Bath (electric heating plate) Method2 Principle
Under the condition of 103 °C ± 2 °C, heat up the test sample, till moisture and volatile matter completely dissipate.3 Instruments and Equipment
3.1 Analytical balance. division value. 0.001 g. 3.2 Plate. flat ceramic or glass plate; diameter. 80 mm/90 mm; depth. around 30 mm. 3.4 Sand bath or electric heating plate (room temperature ~ 150 °C). 3.5 Dryer. contain effective desiccant.4 Analytical Procedures
4.1 Sample Preparation In a pre-dried plate, which is weighed together with the thermometer, weigh-take around 20 g of sample, accurate to 0.001 g. 4.2 Sample Determination Heat up the plate, which is loaded with the test sample, in sand bath, or on an electric heating plate to 90 °C. The rate of temperature rise shall be controlled at around 10 °C/min. During the heating process, use a thermometer to stir it.5 Expression of Analytical Result
The content (X) of moisture and volatile matter shall be expressed in mass fraction, and be calculated in accordance with Formula (1).6 Precision
The absolute difference of two independent determination results obtained under repeatability condition shall not exceed 10% of the arithmetic mean value.7 Principle
Same as Chapter 2.8 Instruments and Equipment
8.1 Analytical balance. division value. 0.001 g. 8.4 Dryer. contain effective desiccant.9 Analytical Procedures
9.1 Sample Preparation In a pre-dried and pre-weighed glass container, in accordance with the predicted content of moisture and volatile matter in the sample, weigh-take 5 g or 10 g of sample, accurate to 0.001 g. 9.2 Sample Determination Place the glass container, which holds the sample, into an electric drying oven at 103 °C ± 2 °C for 1 h. Then, transfer it into a dryer; cool it down to room temperature. Weigh it, accurate to 0.001 g. Repeat the steps of heating, cooling down and weighing.10 Expression of Analytical Result
The content (X) of moisture and volatile matter shall be expressed in mass fraction, and be calculated in accordance with Formula (2).11 Precision
The absolute difference of two independent determination results obtained under repeatability condition shall not exceed 10% of the arithmetic mean value. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
