GB 5009.123-2023 PDF English
US$140.00 · In stock · Download in 9 secondsGB 5009.123-2023: National food safety standard - Determination of chromium in foods Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedureStatus: Valid GB 5009.123: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB 5009.123-2023 | English | 140 |
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National food safety standard - Determination of chromium in foods
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| GB 5009.123-2014 | English | 115 |
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National Food Safety Standard- Determination of chromium in foods
| Obsolete |
| GB/T 5009.123-2003 | English | 70 |
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Determination of chromium in foods
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Excerpted PDFs (Download full copy in 9 seconds upon purchase)PDF Preview: GB 5009.123-2023
GB 5009.123-2023: National food safety standard - Determination of chromium 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/GB5009.123-2023
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
National Food Safety Standard - Determination of
Chromium in Foods
Issued on. SEPTEMBER 6, 2023
Implemented on. MARCH 6, 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 I - Graphite Furnace Atomic Absorption Spectrometry... 4
2 Principle... 4
3 Reagents and Materials... 4
4 Instruments and Equipment... 5
5 Analytical Procedures... 6
6 Expression of Analysis Results... 8
7 Precision... 9
8 Others... 9
Method II - Inductively Coupled Plasma Mass Spectrometry... 9
Appendix A Microwave Digestion Temperature Rise Program and Instrument
Reference Conditions of Graphite Furnace Atomic Absorption Spectrometry... 10
Foreword
This Standard serves as a replacement of GB 5009.123-2014 National Food Safety Standard -
Determination of Chromium in Foods.
In comparison with GB 5009.123-2014, the main changes are as follows.
---The second method “inductively coupled plasma mass spectrometry” is added;
---Specimen preparation is modified;
---The wet digestion method, pressure tank digestion method, microwave digestion
method and dry digestion method are modified.
National Food Safety Standard - Determination of
Chromium in Foods
1 Scope
This Standard specifies the method for the determination of chromium in foods by graphite
furnace atomic absorption spectrometry and inductively coupled plasma mass spectrometry.
This Standard is applicable to the determination of chromium in foods.
Method I - Graphite Furnace Atomic Absorption
Spectrometry
2 Principle
After the specimen is digested, atomize it in a graphite furnace, at 357.9 nm, determine the
absorbance. Within a certain concentration range, the absorbance value of chromium is
proportional to the chromium content. Conduct quantitative comparison with standard series
solutions.
3 Reagents and Materials
Unless it is otherwise specified, the reagents used in this Method are all excellent-grade pure,
and the water is Grade-2 water specified in GB/T 6682.
3.1 Reagents
3.1.1 Nitric acid (HNO3).
3.1.2 Perchloric acid (HClO4).
3.1.3 Ammonium dihydrogen phosphate (NH4H2PO4).
3.2 Preparation of Reagents
3.3 Reference Material
Potassium dichromate (K2Cr2O7, CAS No.. 7778-50-9). purity > 99.99%, or a standard
substance certified by the state and awarded a reference material certificate.
3.4 Preparation of Standard Solutions
3.4.1 Chromium standard stock solution (1,000 mg/L). accurately weigh-take 0.2829 g of
potassium dichromate (110 C, bake for 2 h), dissolve it in water, then, transfer into a 100 mL
volumetric flask. Use nitric acid solution (5 + 95) to dilute it to the scale and evenly mix it. The
mass concentration of chromium in this solution is 1,000 mg/L.
4 Instruments and Equipment
NOTE. all glassware and polytetrafluoroethylene digestion inner tanks need to be soaked in nitric
acid solution (1 + 5) overnight, repeatedly rinsed with tap water, and finally, thoroughly
rinsed with water.
4.1 Atomic absorption spectrometer. equipped with graphite furnace atomizer and chromium
hollow cathode lamp.
4.2 Electronic balance. with a division value of 0.1 mg and 1 mg.
4.3 Adjustable electric heating plate or adjustable electric stove.
4.6 Constant-temperature drying oven.
4.7 Muffle furnace.
5 Analytical Procedures
5.1 Specimen Preparation
5.1.1 Solid-state samples
5.1.1.1 Dry samples
For samples with low-water content, such as. beans, grains, fungi, tea, dried fruits and baked
goods, etc., take the edible part, when necessary, use a high-speed pulverizer to evenly crush it.
For powdery samples that are uniform in shape, such as. solid dairy products, protein powder
and flour, etc., evenly shake them.
5.1.2 Liquid samples
For samples, such as. soft drinks and condiments, etc., evenly shake them.
5.1.3 Semi-solid samples
Evenly mix them.
5.2 Test Conditions of the Method
5.2.1 Specimen pre-treatment
5.2.1.1 Wet digestion method
For solid specimens, weigh-take 0.2 g ~ 3 g (accurate to 0.001 g). For liquid specimens,
accurately transfer-take or weigh-take 0.500 mL (g) ~ 5.00 mL (g) (accurate to 0.001 g) into a
digestion tube with scale.
5.2.1.2 Microwave digestion method
For solid specimens, weigh-take 0.2 g ~ 0.5 g (accurate to 0.001 g; for samples containing
relatively high-water content, the sampling size can be appropriately increased to 1 g). For
liquid specimens, accurately transfer-take or weigh-take 0.500 mL (g) ~ 3.00 mL (g) (accurate
to 0.001 g) into a microwave digestion tank. For samples containing ethanol or carbon dioxide,
firstly heat them at a low temperature to remove ethanol or carbon dioxide, add 5 mL ~ 10 mL
of nitric acid, in accordance with the operation procedures of microwave digestion, digest the
specimen.
5.2.1.4 Dry digestion method
For solid specimens, weigh-take 0.5 g ~ 5 g (accurate to 0.001 g); for liquid specimens,
accurately transfer-take or weigh-take 2.00 mL (g) ~ 10.0 mL (g) (accurate to 0.001 g) into a
crucible, and heat it over low heat; carbonize it, until it becomes smokeless. Then, transfer it
into a muffle furnace, at 550 C, ash it for 3 h ~ 4 h.
5.3 Reference Conditions of Instruments
See Table A.2 for instrument operating conditions.
5.4 Drawing of Standard Curve
In accordance with the mass concentration from low to high, respectively take 10 L of the
standard series of solutions and 5 L of the ammonium dihydrogen phosphate solution (select
the optimal sample injection volume in accordance with the instrument used), meanwhile, inject
it into the graphite tube. After atomization, determine the absorbance value, and by taking the
mass concentration as the x-coordinate and the absorbance value as the y-coordinate, draw a
standard curve.
6 Expression of Analysis Results
The content of chromium in the specimen is calculated in accordance with Formula (1).
7 Precision
When the chromium content in the specimen is > 1 mg/kg (mg/L), the absolute difference
between the results of two independent determinations obtained under repeatability conditions
shall not exceed 10% of the arithmetic mean.
8 Others
When the sampling size is 0.5 g or 2 mL and the constant volume is 10 mL, the detection limit
of this Method is 0.01 mg/kg or 0.003 mg/L, and the quantitation limit is 0.03 mg/kg or 0.008
mg/L.
Appendix A
Microwave Digestion Temperature Rise Program and Instrument
Reference Conditions of Graphite Furnace Atomic Absorption
Spectrometry
A.1 The microwave digestion temperature rise program is shown in Table A.1.
Table A.1 -- Microwave Digestion Temperature Rise Program
A.2 The instrument reference conditions of graphite furnace atomic absorption spectrometry
are shown in Table A.2.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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