GB 5009.4-2010_English: PDF (GB5009.4-2010)
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National food safety standard -- Determination of ash in foods
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GB 5009.4-2010
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| GB 5009.4-2016 | English | 85 |
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National food safety standard -- Determination of ash in foods
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GB 5009.4-2016
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Newer version: GB 5009.4-2016 Standards related to: GB 5009.4-2016
| Standard ID | GB 5009.4-2010 (GB5009.4-2010) | | Description (Translated English) | National food safety standard. Determination of ash in foods | | Sector / Industry | National Standard | | Classification of Chinese Standard | C53 | | Classification of International Standard | 67.040 | | Word Count Estimation | 5,511 | | Date of Issue | 2010-03-26 | | Date of Implementation | 2010-06-01 | | Older Standard (superseded by this standard) | GB/T 5009.4-2003; GB/T 14770-1993 | | Regulation (derived from) | Circular of the Ministry of Health (2010)7 | | Issuing agency(ies) | Ministry of Health of People's Republic of China | | Summary | This Chinese standard specifies the method for determination of ash in foods. This standard applies in addition to starch and its derivatives in food Determination of ash content. | GB 5009.4-2010
National food safety standard.Determination of ash in foods
National Standards of People's Republic of China
National Food Safety Standard
Determination of ash
National food safety standard
Determination of ash in foods
People's Republic of China Ministry of Health issued
Issued on. 2010-03-26
2010-06-01 implementation
Foreword
This standard replaces GB/T 5009.4-2003 "Determination of ash in food" and GB/T 14770-1993 "Determination of ash in foods."
This standard and GB/T 5009.4-2003 compared to the main changes are as follows.
- This standard does not apply for determination of starch and its derivatives in the ash;
- According to different ash content of the sample, modify the sample weight;
- According to GB/T 14770-1993 increase the amount of high phosphorus beans and their products, meat products, egg products, aquatic products, milk and
Dairy products Determination of ash;
- Modify the formulas;
- Modify the precision.
This standard replaces the standards previously issued as follows.
--GB/T 5009.4-1985, GB/T 5009.4-2003;
--GB/T 14770-1993.
National Food Safety Standard
Determination of ash
1 Scope
This standard specifies the method for the determination of ash in foods.
This standard applies to the determination of the ash content in foods other than starch and its derivatives.
Principle 2
After the food by burning the remaining inorganic substance called ash. Department scorching ash value, calculated after weighing.
3 Reagents and materials
3.1 magnesium acetate [(CH3COO) 2Mg · 4H2O)]. AR.
3.2 magnesium acetate solution (80 g/L). Weigh 8.0 g of magnesium acetate (3.1) dissolved in water and dilute to 100 mL, and mix.
3.3 magnesium acetate solution (240 g/L). Weigh 24.0 g magnesium acetate (3.1) dissolved in water and dilute to 100 mL, and mix.
4 instruments and equipment
4.1 muffle furnace. temperature ≥600 ℃.
4.2 Balance. a sense of the amount of 0.1 mg.
4.3 quartz crucible or porcelain crucible.
4.4 dryer (with a desiccant).
4.5 Electric hot plate.
4.6 water bath.
Step 5 Analysis
5.1 crucible burning. Take appropriate size quartz crucible or porcelain crucible in a muffle furnace set at 550 ± 25 ℃ ℃ burning 0.5 h, cooled to
About 200 ℃, take out and put it into the dryer to cool 30 min, accurately weighed. Repeat twice before and after burning to weigh the difference does not exceed 0.5 mg
To constant weight.
5.2 Sample said. ash samples greater than 10 g/100 g Weigh 2 g ~ 3 g (accurate to 0.0001 g); ash samples less than 10 g/100 g of
Weigh 3 g ~ 10 g (accurate to 0.0001 g).
5.3 Determination
5.3.1 General Food
Liquid and semi-solid samples should be evaporated to dryness on a boiling water bath. Or solid sample evaporated after, first in a small fire on a hot plate heated to sample charge
Charring points to smoking, then placed in a muffle furnace, burning at 550 ± 25 ℃ ℃ 4 h. Cooled to about 200 ℃, take out and put it into the dryer
Cooled in 30 min, when the pre-weighing the residue was found burning charcoal tablets, the sample should be dropped into the water a little moist, so that loose agglomeration, evaporated water
It points again to burning carbon particles that means no ash completely before weighing. Repeat twice before and after burning to weigh the difference does not exceed 0.5 mg to constant weight.
(1) calculated according to the formula.
5.3.2 higher phosphorus content of beans and their products, meat products, egg products, aquatic products, milk and dairy products
5.3.2.1 Weigh sample was added 1.00 mL of magnesium acetate solution (3.3) or 3.00 mL magnesium acetate solution (3.2), the sample is completely run
wet. Place 10 min later, water will be evaporated in a water bath, the following steps 5.3.1 from "first on a hot plate at low heat" from the operation
Make. (2) calculated according to the formula.
5.3.2.2 and 5.3.2.1 to draw 3 parts of the same concentration and volume of the magnesium acetate solution, 3 times a reagent blank test. When the 3rd test results
When the standard deviation is less than 0.003 g, the arithmetic mean as a blank value. If the standard deviation exceeds 0.003 g, should be re-done the blank test.
6 expression analysis
Ash the sample according to equation (1), (2) calculation
twenty three
twenty one
1 × -
mm
mmX = (1)
twenty three
2 × -
mm
mmm
X = (2)
Where.
1X (magnesium acetate solution added is not measured) - sample ash content in grams per hundred grams (g/100 g);
2X (added magnesium acetate solution measured) - sample ash content in grams per hundred grams (g/100 g);
0m - magnesia (magnesium acetate after burning product) mass in grams (g);
1m - quality crucible and ash in grams (g);
2m - crucible mass in grams (g);
3m - the quality of the crucible and the sample, in grams (g).
When the ash content of the sample ≥10 g/100 g, rounded to three significant figures; sample ash content < 10 g/100 g, the two reserved
effective number.
7 precision
Two independent determination results under the absolute difference in repeatability condition must not exceed 5% of the arithmetic mean.
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