GB 5009.2-2024 PDF English
US$140.00 · In stock · Download in 9 secondsGB 5009.2-2024: National food safety standard - Determination of relative density of food Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedureStatus: Valid GB 5009.2: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB 5009.2-2024 | English | 140 |
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National food safety standard - Determination of relative density of food
| Valid |
| GB 5009.2-2016 | English | 70 |
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Determination of relative density of foods
| Obsolete |
| GB/T 5009.2-2003 | English | 199 |
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2 days
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Determination of relative density of foods
| Obsolete |
| GB/T 5009.2-1985 | English | 199 |
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2 days
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Method for determination of specific gravity of foods
| Obsolete |
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GB 5009.2-2024: National food safety standard - Determination of relative density of food---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/GB5009.2-2024
GB
NATIONAL STANDARD OF THE
PEOPLE'S REPUBLIC OF CHINA
National food safety standard - Determination of relative
density of food
Issued on. FEBRUARY 8, 2024
Implemented on. AUGUST 8, 2024
Issued by. National Health Commission of the People's Republic of China;
State Administration for Market Regulation.
Table of Contents
Foreword... 3
1 Scope... 4
Method A - Density bottle method... 4
2 Principle... 4
3 Instruments and equipment... 4
4 Analysis steps... 4
5 Expression of analysis results... 5
6 Precision... 5
Method B - Balance method... 5
7 Principle... 5
8 Instruments and equipment... 6
9 Analysis steps... 6
10 Expression of analysis results... 6
11 Precision... 7
Method C - Hydrometer method... 7
12 Principle... 7
13 Instruments and equipment... 7
14 Analysis steps... 7
15 Expression of analysis results... 7
16 Precision... 8
Method D - Oscillating u-tube digital densimeter method... 8
17 Principle... 8
18 Instruments and equipment... 8
19 Analysis steps... 9
20 Presentation of analysis results... 9
21 Precision... 9
Appendix A Density bottle diagram... 10
Appendix B Schematic diagram of Westphal relative density balance... 11
Foreword
This standard replaces GB 5009.2-2016 National food safety standard - Determination
of relative density of food.
Compared with GB 5009.2-2016, the main changes in this standard are as follows.
-- A calculation formula is added in Method C;
-- Method D, oscillating U-tube digital densimeter method, is added.
National food safety standard - Determination of relative
density of food
1 Scope
This standard specifies the method for the determination of the relative density of liquid
foods.
This standard is applicable to the determination of the relative density of liquid foods.
Method A - Density bottle method
2 Principle
The masses of water and the sample filled in the same density bottle at 20 °C are
measured, respectively. The volume of the density bottle, which is the sample volume,
can be determined from the mass of the water. The density of the sample can be
calculated based on the mass and volume of the sample. The ratio of sample density to
water density is the relative density of the sample.
3 Instruments and equipment
3.1 Density bottle. Precision density bottle, see Figure A.1 in Appendix A.
3.2 Constant temperature water bath. The accuracy is ±1 °C.
4 Analysis steps
Take a clean, dry, constant weight, and accurately weighed density bottle. After filling
it with the sample, place it in a water bath and soak it for 0.5 hours until the temperature
of the sample inside reaches (20±1) °C;
5 Expression of analysis results
The relative density of the sample is calculated according to formula (1).
6 Precision
The absolute difference between two independent determination results obtained under
repeatability conditions shall not exceed 5% of the arithmetic mean.
7 Principle
At 20°C, the buoyancy of the glass hammer in water and in the sample are measured,
respectively.
8 Instruments and equipment
8.1 Westphal relative density balance. The sensitivity is 0.1 mg; see Figure B.1 in
Appendix B.
9 Analysis steps
When measuring, place the stand on a flat table, place the beam on the knife edge, hang
a weight on the hook, adjust the lifting knob to the appropriate height, and rotate the
zero-setting knob to make the two pointers match. Then remove the weight, hang up
the glass hammer, add water to the 4/5 position in the glass cylinder, and put it into a
constant temperature water bath; make the water temperature in the glass cylinder
balance and stabilize at (20±1) ℃, let the glass hammer sink to the glass cylinder, try
placing four kinds of riders until the two pointers on the beam coincide, and the reading
at this time is P1;
10 Expression of analysis results
The relative density of the sample is calculated according to formula (2).
11 Precision
The absolute difference between two independent determination results obtained under
repeatability conditions shall not exceed 5% of the arithmetic mean.
12 Principle
Archimedes' principle is used; the liquid sample to be tested is poured into a higher
container, and then the hydrometer is placed into the liquid sample after the temperature
stabilizes at 20 °C.
13 Instruments and equipment
13.1 Hydrometer. There is a scale label in the upper thin tube to indicate the density
reading.
13.2 Constant temperature water bath. The accuracy is ±1 °C.
14 Analysis steps
Wash and dry the hydrometer, and slowly place it into a suitable measuring cylinder
containing an appropriate amount of liquid sample to be tested, and the cylinder has
been at (20±1) °C in a constant temperature water bath. Do not let the hydrometer touch
the wall and bottom of the container.
15 Expression of analysis results
The relative density of the sample is calculated according to formula (3).
16 Precision
The absolute difference between two independent measurement results obtained under
repeatability conditions shall not exceed 5% of the arithmetic mean.
17 Principle
Electromagnetic induces the oscillation of the glass U-tube, the magnitude of the
oscillation frequency squared is linearly related to the density of the sample in the
measuring cell, and the density of the sample is thus determined.
18 Instruments and equipment
18.1 Oscillating U-tube digital densimeter. with automatic viscosity correction and
temperature and thermal balance functions.
19 Analysis steps
19.1 Calibration of the instrument
Before testing, calibrate the instrument according to the instructions of the instrument.
20 Presentation of analysis results
The result is expressed to the third decimal place.
21 Precision
The absolute difference between two independent measurement results obtained under
repeatability conditions shall not exceed 5% of the arithmetic mean.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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