GB 5009.87-2016 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB 5009.87-2016 | English | 70 |
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National food safety standard - Determination of Phosphorus in Foods
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| GB/T 5009.87-2003 | English | 239 |
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Determination of phosphorus in foods
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GB 5009.87-2016: National food safety standard - Determination of Phosphorus in Foods---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/GB5009.87-2016
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
National Food Safety Standard -
Determination of Phosphorus in Foods
Issued on. DECEMBER 23, 2016
Implemented on. JUNE 23, 2017
Issued by. National Health and Family Planning Commission of the PRC;
China Food and Drug Administration.
Table of Contents
Foreword... 3
1 Scope... 4
2 Principles... 4
3 Reagents and materials... 4
4 Instruments and equipment... 6
5 Analytical procedures... 6
6 Analysis results expression... 8
7 Precision... 9
8 Others... 9
9 Principles... 9
10 Reagents and materials... 10
11 Instruments and equipment... 11
12 Analytical procedures... 11
13 Analysis results expression... 12
14 Precision... 12
15 Others... 12
Foreword
This Standard replaces the method for determination of phosphorus in GB/T
5009.87-2003 “Determination of phosphorus in foods”, GB 5413.22-2010
“National food safety standard - Determination of phosphorus in foods for
infants and young children, milk and milk products”, GB/T 22427.11-2008
“Starches and derived products - Determination of total phosphorus content”,
GB/T 9695.4-2009 “Meat and meat products -Determination of total
phosphorus”, GB/T 18932.11-2002 “Method for the determination of potassium,
phosphorus, iron, calcium, zinc, aluminium, sodium, magnesium, boron,
manganese, copper, barium, titanium, vanadium, nickel, cobalt, chromium
contents in honey - Inductively coupled plasma atomic emission spectrum”,
GB/T 23375-2009 “Determination of copper, iron, zinc, calcium, magnesium
and phosphorus content in vegetables and derived products”, NY/T 1018-2006
“Determination of phosphorus content in vegetables and derived products”,
NY/T 1738-2009 “Determination of phosphorus content in crops and derived
products - Spectrophotometry”, SN/T 0446-1995 “Method for the determination
of phosphorus in milk product for export”, and SN/T 0801.2-2011 “Animal and
vegetable oil and fats for import and export - Part 2.Determination of
phosphorous”.
As compared with GB/T 5009.87-2003, the main changes of this Standard are
as follows.
- The standard’s name is changed to “National Food Safety Standard -
Determination of Phosphorus in Foods”;
- DELETE weight method.
National Food Safety Standard -
Determination of Phosphorus in Foods
1 Scope
This Standard specifies spectrophotometry and inductively coupled plasma
emission spectrum for the determination of phosphorus in foods.
Methods 1 and 3 of this Standard are applicable to the determination of
phosphorus in various foods. Method 2 is applicable to the determination of
phosphorus in foods for infants and young children, milk and milk products.
Method 1 -- Molybdenum blue spectrophotometry
2 Principles
After the sample is digested, phosphorus, under acidic conditions, is combined
with ammonium molybdate to form ammonium phosphomolybdate. This
compound is reduced to blue compound molybdenum blue by hydroquinone,
sodium sulfite, or stannous chloride, hydrazine sulfate. The absorbance value
of key blue at 660 nm is directly proportional to the concentration of phosphorus.
USE a spectrophotometer to determine the absorbance value of the sample
solution; and COMPARE it with standard series to quantify.
3 Reagents and materials
Unless otherwise stated, the reagents used in this method are analytically pure.
The water is the Grade III water specified in GB/T 6682.
3.1 Reagents
3.1.1 Sulfuric acid (H2SO4). guaranteed reagent.
3.1.2 Perchloric acid (HClO4). guaranteed reagent.
3.1.7 Ammonium molybdate [(NH4)6Mo7O24 · 4H2O].
3.1.8 Stannous chloride (SnCl2 · 2H2O).
3.1.9 Hydrazine sulfate (NH2NH2 · H2SO4).
3.2 Preparation of reagents
3.2.1 Sulfuric acid solution (15%). MEASURE 15 mL of sulfuric acid; ADD slowly
to 80 mL of water; after cooling, USE water to dilute to 100 mL; and MIX it well.
3.2.6 Hydroquinone solution (5 g/L). WEIGH 0.5 g of hydroquinone in 100 mL
of water to dissolve it; ADD a drop of sulfuric acid; and MIX well.
3.3 Standard
Potassium dihydrogen phosphate (KH2PO4, CAS No.7778-77-0).
Purity >99.99%. Or a phosphorus standard solution of certain concentration
which has been certified by the state and awarded a reference material
certificate.
3.4 Preparation of standard solutions
4 Instruments and equipment
4.1 Spectrophotometer.
4.4 Analytical balance. The sensitivity is 0.1 mg and 1 mg.
5 Analytical procedures
5.1 Preparation of samples
During sampling and sample preparation, contamination shall be avoided.
5.1.1 Grain, beans
After removing the dopants, the samples are crushed and stored in plastic
bottles.
5.2 Pretreatment for samples
5.2.1 Wet digestion
WEIGH 0.2 g~3 g (accurate to 0.001 g) of the sample or accurately PIPETTE
0.500 mL~5.00 mL of the liquid sample in a graduated digestive tube; ADD 10
mL of nitric acid, 1 mL of perchloric acid, 2 mL of sulfuric acid; to DIGEST it on
the adjustable electric heating furnace (reference conditions.
5.2.2 Dry ashing
WEIGH 0.5 g~5 g (accurate to 0.001 g) of the sample or accurately PIPETTE
0.500 mL~10.0 mL of the liquid sample; BURN it on the fire to charcoal; and
then at 550 °C, FORM ash, until the ash is white (If necessary, ashing may be
performed after wetting with concentrated nitric acid and drying); ADD 10 mL of
hydrochloric acid solution (1+1); and EVAPORATE on a water bath.
5.3 Determination
Note. Optional hydroquinone, sodium sulfite reduction method or stannous chloride,
hydrazine sulfate reduction method.
5.3.1 Hydroquinone, sodium sulfite reduction method
5.3.2 Stannous chloride, hydrazine sulfate reduction method
5.3.2.1 Making of standard curve
Accurately PIPETTE 0 mL, 0.500 mL, 1.00 mL, 2.00 mL, 3.00 mL, 4.00 mL, and
5.00 mL of phosphorus standard use solution, equivalent to 0 μg, 5.00 μg, 10.0
μg, 20.0 μg, 30.0 μg, 40.0 μg, and 50.0 μg of phosphorus content; PLACE them
in 25 mL test tubes with stoppers separately;
6 Analysis results expression
The phosphorus content in the sample shall be calculated according to the
equation (1).
7 Precision
The absolute difference between the two independent determination results,
obtained under repeated conditions, shall not exceed 5% of the arithmetic mean.
8 Others
When the sample volume is 0.5 g (or 0.5 mL) and is diluted to 100 mL, the limit
of detection is 20 mg/100 g (or 20 mg/100 mL);
9 Principles
After the sample is digested, phosphorus, under acidic conditions, forms yellow
complex vanadium molybdenum yellow with ammonium vanadium molybdate.
10 Reagents and materials
Unless otherwise stated, the reagents used in this method are analytically pure.
The water is the Grade III water specified in GB/T 6682.
10.1 Reagents
10.1.6 Sodium hydroxide (NaOH).
10.1.7 2,6-dinitrophenol or 2,4-dinitrophenol [C6H3OH(NO2)2].
10.2 Preparation of reagents
10.2.1 Ammonium vanadium molybdate reagent.
Solution A. WEIGH 25 g of ammonium molybdate, and DISSOLVE it in 400
mL of water.
10.2.4 Nitric acid solution (0.2 mol/L). PIPETTE 12.5 mL of nitric acid; USE
water to dilute to 1000 mL and MIX well.
10.2.5 Dinitrophenol indicator (2 g/L). WEIGH 0.2 g of 2,6-dinitrophenol or 2,4-
dinitrophenol to dissolve in 100 mL of water and MIX well.
10.3 Standard
Potassium dihydrogen phosphate (KH2PO4, CAS No.7778-77-0).
Purity >99.99%. Or a phosphorus standard solution of certain concentration
which has been certified by the state and awarded a reference material
certificate.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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