GB 5009.91-2017 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB 5009.91-2017 | English | 85 |
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National food safety standard - Determination of potassium and sodium in foods
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| GB/T 5009.91-2003 | English | 199 |
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Determination of potassium and sodium in foods
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GB 5009.91-2017: National food safety standard - Determination of potassium and sodium 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/GB5009.91-2017
GB
NATIONAL STANDARD
National food safety standard
Determination of potassium and sodium in foods
Issued on. APRIL 06, 2017
Implemented on. OCTOBER 06, 2017
Issued by. National Health and Family Planning Commission of the PRC;
State Food and Drug Administration
Table of Contents
Foreword... 3
1 Scope... 4
2 Principle... 4
3 Reagents and materials... 4
4 Instruments and equipment... 6
5 Analytical procedures... 6
6 Expression of analytical results... 9
7 Precision... 9
8 Others... 9
9 Principles... 10
10 Reagents and materials... 10
11 Instruments and equipment... 11
12 Analytical procedures... 12
13 Expression of analytical results... 12
14 Precision... 13
15 Others... 13
Appendix A Sample determination reference condition... 14
Foreword
This standard replaces the potassium and sodium determination part in GB/T
5009.91-2003 “Determination of potassium and sodium in foods”, GB/T
15402-1994 “Fruits, vegetables and derived products – determination of
sodium and potassium”, NY 82.18-1988 “Determination of potassium and
sodium in fruit juice”, GB 5413.21-2010 “National food safety standard –
Determination of calcium, iron, zinc, sodium, potassium, magnesium, copper
and manganese in foods for infants and young children, milk and milk
products”, GB/T 18932.11-2002 “Method for determination of potassium,
phosphorus, iron, calcium, zinc, aluminum, sodium, magnesium, boron,
manganese, copper, barium, titanium, vanadium, nickel, cobalt and chromium
in honey - Inductively coupled plasma atomic emission spectrometry (ICP-AES
method”, GB/T 18932.12-2002 “Method for determination of potassium,
sodium, calcium, magnesium, zinc, iron, copper, manganese, chromium, lead
and cadmium contents in honey - Atomic absorption spectrometry”, AND NY/T
1653-2008 “Determination for mineral elements in vegetables, fruits, and
derived products by ICP-AES method”.
As compared with the above standards, the main changes are as follows.
- CHANGE the standard name into “National food safety standard -
Determination of potassium and sodium in foods”;
- MODIFY the flame atomic absorption spectrometry method as the first
method, the flame atomic emission spectrometry method as the second
method, the inductively coupled plasma emission spectroscopy method
as the third method, AND the inductively coupled plasma mass
spectrometry as the fourth method;
- MODIFY some part of the sample preparation;
- MODIFY some part of the sample digestion;
- INCREASE the method detection limit and quantitative limit;
- ADD appendix.
National food safety standard
Determination of potassium and sodium in foods
1 Scope
This standard specifies four methods for the determination of potassium and
sodium in food. the flame atomic absorption spectrometry, the flame atomic
emission spectrometry, the inductively coupled plasma emission spectroscopy,
AND the inductively coupled plasma mass spectrometry.
This standard applies to the determination of potassium and sodium in food.
Method I. Flame atomic absorption spectrometry
2 Principle
After digestion, the sample is injected into the atomic absorption spectrometer.
After the flame atomization, the potassium and sodium respectively absorb the
766.5 nm and 589.0 nm resonance line. AND within a concentration range, its
absorption value is proportional to the contents of potassium and sodium, AND
it is quantified through comparison with standard series.
3 Reagents and materials
Unless otherwise specified, the reagents used in this method are excellent
grade pure, AND the water is level II water as specified in GB/T 6682.
3.1 Reagents
3.2 Reagent preparation
3.3 Standard substance
3.3.1 Potassium chloride standard substance (KCl). its purity is greater than
99.99%.
3.3.2 Sodium chloride standard substance (NaCl). its purity is greater than
99.99%.
3.4 Preparation of standard solution
3.4.1 Potassium and sodium standard stock solution (1000 mg/L). PLACE the
potassium chloride or sodium chloride in the oven at 110 °C ~ 120 °C to dry it
for 2 h. Accurately WEIGH 1.9068 g of potassium chloride or 2.5421 g of
sodium chloride;
3.4.2 Potassium and sodium standard working solution (100 mg/L). accurately
PIPETTE 10.0 mL of potassium or sodium standard stock solution in a 100 mL
volumetric flask; USE water to dilute it to the mark; STORE it in a polyethylene
bottle; PRESERVE it at 4 °C.
3.4.3 Potassium and sodium standard series working solution. accurately
PIPETTE 0 mL, 0.1 mL, 0.5 mL, 1.0 mL, 2.0 mL, and 4.0 mL of potassium
standard working solution in 100 mL volumetric flask; ADD 4 mL of cesium
chloride solution; USE water to make its volume reach to the mark;
4 Instruments and equipment
4.1 Atomic absorption spectrometer, with flame atomizer and potassium,
sodium hollow cathode lamp.
4.2 Analytical balance. sensitivity of 0.1 mg and 1.0 mg.
4.5 Muffle furnace.
4.6 Adjustable temperature control heating plate.
4.7 Adjustable temperature control electric furnace.
4.8 Microwave digestion instrument, with a polytetrafluoroethylene digestion
internal tank.
5 Analytical procedures
5.1 Preparation of sample
5.1.1 Solid samples
5.1.1.1 Dry sample
As for the beans, cereals, fungi, tea, dried fruit, baked goods and other low
water content samples, TAKE the edible part; USE high-speed grinder to crush
it uniformly if necessary; AND as for the solid dairy products, protein powder,
flour, and other uniform powdery sample, SHAKE it uniformly.
5.1.3 Semi-solid samples
STIR it uniformly.
5.2 Sample digestion
5.2.1 Microwave digestion method
WEIGH 0.2 g ~ 0.5 g (accurate to 0.001 g) of sample; PLACE it into the
microwave digestion tank; as for the samples containing ethanol or carbon
dioxide, PLACE it on the heating plate to heat it at low temperature to remove
ethanol or carbon dioxide; ADD 5 mL ~ 10 mL of nitric acid; COVER and
PLACE it for 1 h or overnight; TIGHTEN the external tank; PLACE it in the
microwave digestion device for digestion (the digestion conditions are as
shown in Table A.1). After cooling it, TAKE out the internal tank; PLACE it in an
adjustable temperature control electric furnace; REMOVE acid at 120 °C ~
140 °C to make it almost dry; USE water to make its volume reach to 25 mL or
50 mL; MIX it uniformly to prepare for use; and meanwhile MAKE blank test.
5.2.4 Dry digestion method
WEIGH 0.5 g ~ 5 g (accurate to 0.001 g) of sample in the crucible; MAKE it
subject to carbonization in the electric furnace at small fire to make it
smokeless; PLACE it into the 525 °C ± 25 °C muffle furnace for ashing for 5 h ~
8 h; COOL it. If there is black carbon particles due to incomplete ashing, COOL
it and ADD a small amount of nitric acid to wet it;
5.3 Instrument reference conditions
OPTIMIZE the instrument to the best condition, AND the main conditions of the
instrument are as shown in Table A.2.
5.4 Production of standard curve
Respectively INJECT the potassium and sodium standard series working
solution into the atomic absorption spectrometer;
5.5 Determination of sample solution
In accordance with the content of the element under determination in the
sample solution, USE water to dilute the sample solution to the appropriate
concentration if necessary; and ADD a certain amount of cesium chloride
solution into the blank solution and the sample final determination solution, to
make the concentration of cesium chloride reach to 0.2 %.
6 Expression of analytical results
The potassium and sodium contents in the sample are calculated in
accordance with the formula (1).
7 Precision
The absolute difference between the two independent determinations obtained
under repeatability shall not exceed 10% of the arithmetic mean.
8 Others
If the sampling amount is 0.5 g and its volume is made to 25 mL, the detection
limit of sodium is 0.2 mg/100 g AND the quantification limit is 0.5 mg/100 g;
9 Principles
After the sample is subjected to digestion, it is injected into the flame
photometer or atomic absorption spectrometer; AND after the flame
atomization, the emission intensity of potassium and sodium is determined
respectively.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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