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National food safety standard - Food contact materials and products - Determination of multi-elements and determination of multi-element migration
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National food safety standard -- Food contact materials and articles -- Migration of arsenic, cadmium, chromium, nickel, lead, antimony and zinc
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GB 31604.49-2023
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
National Food Safety Standard - Food Contact Materials
and Products - Determination of Multi-elements and
Determination of Multi-element Migration
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 ... 4
1 Scope ... 5
Part 1 - Determination of Arsenic, Cadmium, Chromium and Lead ... 5
Method 1 Inductively Coupled Plasma Mass Spectrometry ... 5
2 Principle ... 5
3 Reagents and Materials ... 5
4 Instruments and Equipment ... 7
5 Analytical Procedures ... 7
6 Expression of Analysis Results ... 9
7 Precision ... 10
8 Others ... 10
Method 2 Inductively Coupled Plasma Optical Emission Spectrometry ... 10
9 Principle ... 10
10 Reagents and Materials ... 11
11 Instruments and Equipment ... 11
12 Analytical Procedures ... 12
13 Expression of Analysis Results ... 13
14 Precision ... 13
15 Others ... 13
Part 2 - Determination of Aluminum, Arsenic, Barium, Cadmium, Cobalt, Chromium,
Copper, Iron, Lithium, Manganese, Molybdenum, Nickel, Lead, Antimony, Tin and
Zinc Migration ... 14
Method 1 Inductively Coupled Plasma Mass Spectrometry ... 14
16 Principle ... 14
17 Reagents and Materials ... 14
18 Instruments and Equipment ... 16
19 Analytical Procedures ... 16
20 Expression of Analysis Results ... 18
21 Precision ... 19
22 Others ... 19
Method 2 Inductively Coupled Plasma Optical Emission Spectrometry ... 20
23 Principle ... 20
24 Reagents and Materials ... 21
25 Instruments and Equipment ... 22
26 Analytical Procedures ... 22
27 Expression of Analysis Results ... 23
28 Precision ... 24
29 Others ... 24
Appendix A Mass Concentration of Standard Series Solution ... 25
Appendix B Reference Conditions of Instrument ... 28
National Food Safety Standard - Food Contact Materials
and Products - Determination of Multi-elements and
Determination of Multi-element Migration
1 Scope
This Standard specifies the method for the determination of arsenic, cadmium, chromium and
lead, and the determination of aluminum, arsenic, barium, cadmium, cobalt, chromium, copper,
iron, lithium, manganese, molybdenum, nickel, lead, antimony, tin and zinc migration in food
contact materials and products.
Part 1 is applicable to the determination of arsenic, cadmium, chromium and lead in food
contact paper and cardboard materials and products, cork stoppers and bamboo and wood
products.
Part 2 is applicable to the determination of aluminum, arsenic, barium, cadmium, cobalt,
chromium, copper, iron, lithium, manganese, molybdenum, nickel, lead, antimony, tin and zinc
migration in food contact plastic materials and products, food contact paints and coatings, food
contact rubber materials and products, inks for food contact materials and products, adhesives
for food contact materials and products, food contact paper and cardboard materials, pacifiers,
enamel products, ceramic products, glass products, food contact plastic resins, food contact
metal materials and products.
Part 1 - Determination of Arsenic, Cadmium, Chromium
and Lead
Method 1 Inductively Coupled Plasma Mass Spectrometry
2 Principle
After the specimen is crushed, use nitric acid for digestion. After the obtained solution is diluted
with water to a constant volume, adopt an inductively coupled plasma mass spectrometer to
conduct the determination. Take the specific mass number of the element (mass-to-charge ratio,
m/z) for qualitative analysis and the external standard method for quantitative analysis.
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-1 water specified in GB/T 6682.
3.1 Reagents
3.1.1 Nitric acid (HNO3): excellent-grade pure or higher.
3.1.2 Argon (Ar): argon ( 99.995%) or liquid argon.
3.1.3 Helium (He): helium ( 99.995%).
3.2 Preparation of Reagents
3.2.1 Nitric acid solution (5 + 95): measure-take 50 mL of nitric acid, slowly add it to 950 mL
of water and evenly mix it.
3.2.2 Nitric acid solution (1 + 4): measure-take 1 L of nitric acid, slowly add it to 4 L of water
and evenly mix it.
3.3 Reference Materials
3.3.1 Element standard solution (1,000 mg/L or 100 mg/L): for arsenic, cadmium, chromium
and lead, adopt single-element or multi-element standard stock solutions certified by the state
and awarded a reference material certificate. It shall remain valid for 1 year.
3.3.2 Internal standard element solution (1,000 mg/L or 100 mg/L): for scandium, germanium,
rhodium, indium, rhenium and bismuth, adopt single-element or multi-element standard stock
solutions certified by the state and awarded a reference material certificate. It shall remain valid
for 2 years.
3.4 Preparation of Standard Solutions
3.4.1 Mixed standard working solution: accurately draw an appropriate amount of single-
element or multi-element mixed standard stock solution, use nitric acid solution (5 + 95) to
dilute it step by step to prepare a mixed standard series solution. The concentration of each
element is shown in Table A.1 in Appendix A. After the mixed standard series solution is
prepared, transfer it to a brown glass container and store it away from light at room temperature.
It shall remain valid for 1 month.
NOTE: the concentration and range of the element in the standard series solution can be
appropriately adjusted in accordance with the sensitivity and linear range of the instrument,
and the actual content of each element in the specimen solution.
3.4.2 Internal standard working solution: take an appropriate amount of internal standard single-
element stock solution or internal standard multi-element stock solution, use nitric acid solution
(5 + 95) to prepare a multi-element internal standard working solution of an appropriate
concentration. After the specimen solution is mixed, the reference concentrations of the internal
standard elements are shown in A.5 in Appendix A. After the internal standard working solution
is prepared, transfer it to a brown glass container and store it away from light at room
tank out of the digestion instrument. After the digestion tank has been completely cooled down,
slowly open the inner cover. Use a small amount of water to rinse the inner cover twice and put
it in the digestion tank. Place the digestion tank on the temperature-controllable electric hot
plate and heat it at about 140 C for 30 min, or place it in the ultrasonic cleaning machine for 5
min. Transfer all the digestion solution to a 25 mL or 50 mL volumetric flask, use water to reach
a constant volume to the scale, evenly mix it and reserve it for later testing.
5.2.1.2 Blank test
Except that no specimen is added, proceed in accordance with 5.2.1.1 to obtain a blank test
solution.
5.2.2 Pressure tank digestion method
5.2.2.1 Preparation of specimen solution
Weigh-take 0.5 g (accurate to 0.1 mg) of the crushed specimen, place it in the
polytetrafluoroethylene digestion inner tank, add 5 mL ~ 8 mL of nitric acid, cover it and leave
it for 1 h. Seal the digestion inner tank in the stainless-steel outer tank, and place it in a constant-
temperature drying oven for digestion (see Table B.1 in Appendix B for the reference conditions
of digestion). After digestion, wait until the digestion tank has been completely cooled down
before slowly opening the inner cover. Use a small amount of water to rinse the inner cover
twice and put it in the digestion tank. Place the digestion tank on the temperature-controllable
electric hot plate and heat it at about 140 C for 30 min, or place it in the ultrasonic cleaning
machine for 5 min. Transfer all the digestion solution to a 25 mL or 50 mL volumetric flask,
use water to reach a constant volume to the scale, evenly mix it and reserve it for later testing.
5.2.2.2 Blank test
Except that no specimen is added, proceed in accordance with 5.2.2.1 to obtain a blank test
solution.
5.3 Reference Conditions of Instrument
5.3.1 Instrument operating conditions
The reference working conditions of the instrument are shown in Table B.2 in Appendix B. The
element reference analysis mode is shown in Table B.3 in Appendix B.
NOTE: for instruments that do not have a suitable interference elimination mode, it is necessary to
adopt the interference correction equations to correct the determination results. The
interference correction equation for arsenic, cadmium and lead, etc. are shown in Table B.4
in Appendix B.
5.3.2 Reference conditions of determination
Under the operating conditions of the selected instrument, edit the determination method; in
accordance with the properties of the element to be determined, select the corresponding
10 Reagents and Materials
Unless it is otherwise specified, the reagents used in this Method are all excellent-grade pure,
and the water is Grade-1 water specified in GB/T 6682.
10.1 Reagents
10.1.1 Nitric acid (HNO3): excellent-grade pure or higher.
10.1.2 Argon (Ar): argon ( 99.995%) or liquid argon.
10.2 Preparation of Reagents
10.2.1 Nitric acid solution (5 + 95): measure-take 50 mL of nitric acid, slowly add it to 950 mL
of water and evenly mix it.
10.2.2 Nitric acid solution (1 + 4): measure-take 1 L of nitric acid, slowly add it to 4 L of water
and evenly mix it.
10.3 Reference Materials
Element standard solution (1,000 mg/L or 100 mg/L): for arsenic, cadmium, chromium and
lead, adopt single-element or multi-element standard stock solutions certified by the state and
awarded a reference material certificate. It shall remain valid for 1 year.
10.4 Preparation of Standard Solution
Mixed standard working solution: accurately draw an appropriate amount of single-element or
multi-element mixed standard stock solution, use nitric acid solution (5 + 95) to dilute it step
by step to prepare a mixed standard series solution. The mass concentration of each element is
shown in Table A.2 in Appendix A. After the mixed standard series solution is prepared, transfer
it to a brown glass container and store it away from light at room temperature. It shall remain
valid for 1 month.
NOTE: the concentration and range of the element in the standard series solution can be
appropriately adjusted in accordance with the sensitivity and linear range of the instrument,
and the actual content of each element in the specimen solution.
11 Instruments and Equipment
NOTE: all glassware and plasticware need to be soaked in nitric acid solution (1 + 4) overnight,
rinsed with water and reserved for later use.
11.1 Inductively coupled plasma optical emission spectrometer (ICP-OES).
11.2 Balance: with a division value of 0.1 mg.
17.2.1 Food simulant: 4% (volume fraction) acetic acid, 10% (volume fraction) ethanol, 20%
(volume fraction) ethanol, 50% (volume fraction) ethanol, 95% (volume fraction) ethanol, 1
g/L citric acid, 5 g/L citric acid and artificial tap water, which are prepared in accordance with
the stipulations of GB 5009.156.
17.2.2 Nitric acid solution (5 + 95): measure-take 50 mL of nitric acid, slowly add it to 950 mL
of water and evenly mix it.
17.2.3 Nitric acid solution (1 + 4): measure-take 1 L of nitric acid, slowly add it to 4 L of water
and evenly mix it.
17.3 Reference Materials
17.3.1 Element standard solution (1,000 mg/L or 100 mg/L): for aluminum, arsenic, barium,
cadmium, cobalt, chromium, copper, iron, lithium, manganese, molybdenum, nickel, lead,
antimony, tin and zinc, adopt single-element or multi-element standard stock solutions certified
by the state and awarded a reference material certificate. It shall remain valid for 1 year.
17.3.2 Internal standard element solution (1,000 mg/L or 100 mg/L): for scandium, germanium,
rhodium, indium, rhenium and bismuth, adopt single-element or multi-element standard stock
solutions certified by the state and awarded a reference material certificate. It shall remain valid
for 2 years.
17.4 Preparation of Standard Solutions
17.4.1 Mixed standard working solution: accurately draw an appropriate amount of single-
element or multi-element mixed standard stock solution, use 4% (volume fraction) acetic acid
solution [applicable to 4% (volume fraction) acetic acid specimen solution], 1 g/L citric acid
solution and 5 g/L citric acid solution (respectively applicable to citric acid specimen solutions
of different concentrations), nitric acid solution (5 + 95) (applicable to artificial tap water,
alcohol, isooctane and olive oil specimen solutions) to dilute it step by step to prepare a mixed
standard series solution. The concentration of each element is shown in Table A.3 in Appendix
A. After the mixed standard series solution is prepared, transfer it to a brown glass container
and store it at room temperature. It shall remain valid for 1 month.
NOTE: the concentration and range of the element in the standard series solution can be
appropriately adjusted in accordance with the sensitivity and linear range of the instrument,
and the actual content of each element in the food simulant migration specimen solution.
17.4.2 Internal standard working solution: take an appropriate amount of internal standard
single-element stock solution or internal standard multi-element stock solution, use nitric acid
solution (5 + 95) to prepare a multi-element internal standard used solution of an appropriate
concentration. After the specimen solution is mixed, the reference concentrations of the internal
standard elements are shown in A.5 in Appendix A. After the internal standard working solution
is prepared, transfer it to a brown glass container and store it at room temperature. It shall
remain valid for 1 month.
NOTE: the internal standard solution can be manually and quantitatively added when preparing the
mixed standard series solution and the specimen solution to be tested, or it can be added
online by the instrument. The internal standard concentration can be adjusted in accordance
with the ratio of the internal standard injection volume and the sample injection volume.
18 Instruments and Equipment
NOTE: all glassware and plasticware need to be soaked in nitric acid solution (1 + 4) overnight,
rinsed with water and reserved for later use.
18.1 Inductively coupled plasma mass spectrometer (ICP-MS).
18.2 Analytical balance: with a division value of 0.01 g and 0.1 mg, respectively.
18.3 Temperature-controllable electric hot plate.
18.4 Rotary evaporator.
18.5 Microporous filter membrane: hydrophilic PTFE, 0.45 m.
19 Analytical Procedures
19.1 Specimen Preparation
19.1.1 Types of food simulants
In this Standard, the migration test adopts 4% (volume fraction) acetic acid, 10% (volume
fraction) ethanol, 20% (volume fraction) ethanol, 50% (volume fraction) ethanol, 95% (volume
fraction) ethanol, 1 g/L citric acid, 5 g/L citric acid, artificial tap water, olive oil and isooctane
as food simulants.
19.1.2 Migration test
In accordance with the intended purposes and usage conditions of the sample to be tested, and
the migration test methods and test conditions specified in GB 5009.156, GB 31604.1 and the
stipulations of relevant product standards, conduct the migration test. After the food simulant
soaking solution is thoroughly mixed, take part of the soaking solution for analysis.
19.1.3 Preparation of specimen solution
19.1.3.1 4% (volume fraction) acetic acid and citric acid specimen solution
Filter 4% (volume fraction) acetic acid soaking solution, 1 g/L citric acid and 5 g/L citric acid
soaking solution through the microporous filter membrane, then, directly inject it for
determination.
19.1.3.2 Artificial tap water specimen solution
Take 2.5 mL of nitric acid and place it in a 50 mL volumetric flask. Use the filtrate of the
artificial tap water soaking solution filtered through the microporous filter membrane to reach
a constant volume, evenly mix it and reserve it for later use.
19.1.3.3 Alcohol specimen solution
Accurately weigh-take 10 g (accurate to 0.01 g) of 10% (volume fraction) ethanol, 20% (volume
fraction) ethanol, 50% (volume fraction) ethanol and 95% (volume fraction) ethanol soaking
solution into a digestion tube or 100 mL conical flask. Place it on a temperature-controllable
electric hot plate, at about 150 C, evaporate the specimen solution to almost dryness, then, add
5 mL of nitric acid solution (5 + 95), continue heating for 5 min ~ 10 min and prevent
evaporation to dryness. Take it out and cool to room temperature, then, use nitric acid solution
(5 + 95) to transfer and reach a constant volume of 10 mL, evenly mix it and reserve it for later
use.
19.1.3.4 Olive oil specimen solution
Weigh-take 0.5 g (accurate to 0.1 mg) of olive oil soaking solution, in accordance with the
stipulations of 5.2, conduct pre-treatment.
19.1.3.5 Isooctane specimen solution
Accurately weigh-take 10 g (accurate to 0.01 g) of isooctane soaking solution into a 50 mL
pear-shaped distillation bottle. In a normal-temperature water bath, conduct rotary evaporation
under reduced pressure to dryness, then, use nitric acid (5 + 95) to rinse the pear-shaped
distillation bottle for three times, combine the washing solution and use nitric acid solution (5
+ 95) to reach a constant volume of 10 mL, evenly mix it and reserve it for later testing.
19.1.3.6 Blank test solution
Food simulants that are not in contact with food contact materials and products are treated in
accordance with 19.1.2 and 19.1.3 to obtain a blank test solution.
19.2 Reference Conditions of Instrument
Same as 5.3.
19.3 Drawing of Standard Curve
In accordance with the concentration from low to high, determine the signal response values of
the element to be determined and the internal standard element in the mixed standard working
solution containing the internal standard element. Take the concentration of the element to be
determined as the x-coordinate, and the ratio of the signal response value of the element to be
determined to the signal response value of the selected internal standard element as the y-
coordinate to draw a standard curve.
19.4 Determination of Specimen Solution
24 Reagents and Materials
Unless it is otherwise specified, the reagents used in this Method are all excellent-grade pure,
and the water is Grade-1 water specified in GB/T 6682.
24.1 Reagents
24.1.1 Nitric acid (HNO3): excellent-grade pure or higher.
24.1.2 Argon (Ar): argon ( 99.995%) or liquid argon.
24.1.3 Reagents required for the preparation of food simulants: in accordance with the
stipulations of GB 5009.156.
24.2 Preparation of Reagents
24.2.1 Food simulant: 4% (volume fraction) acetic acid, 10% (volume fraction) ethanol, 20%
(volume fraction) ethanol, 50% (volume fraction) ethanol, 95% (volume fraction) ethanol, 1
g/L citric acid, 5 g/L citric acid and artificial tap water, which are prepared in accordance with
the stipulations of GB 5009.156.
24.2.2 Nitric acid solution (5 + 95): measure-take 50 mL of nitric acid, slowly add it to 950 mL
of water and evenly mix it.
24.2.3 Nitric acid solution (1 + 4): measure-take 1 L of nitric acid, slowly add it to 4 L of water
and evenly mix it.
24.3 Reference Materials
Element standard solution (1,000 mg/L or 100 mg/L): for aluminum, arsenic, barium, cadmium,
cobalt, chromium, copper, iron, lithium, manganese, molybdenum, nickel, lead, antimony, tin
and zinc, adopt single-element or multi-element standard stock solutions certified by the state
and awarded a reference material certificate. It shall remain valid for 1 year.
24.4 Preparation of Standard Solution
Mixed standard working solution: accurately draw an appropriate amount of single-element or
multi-element mixed standard stock solution, use 4% (volume fraction) acetic acid solution
[applicable to 4% (volume fraction) acetic acid specimen solution], 1 g/L citric acid solution
and 5 g/L citric acid solution (respectively applicable to citric acid specimen solutions of
different concentrations), nitric acid solution (5 + 95) (applicable to artificial tap water, alcohol
and isooctane specimen solutions) to dilute it step by step to prepare a mixed standard series
solution. The concentration of each element is shown in Table A.4 in Appendix A. After the
mixed standard series solution is prepared, transfer it to a brown glass container and store it at
room temperature. It shall remain valid for 1 month.
NOTE: the concentration and range of the element in the standard series solution can be
appropriately adjusted in accordance with the sensitivity and linear range of the instrument,
and the actual content of each element in the food simulant migration specimen solution.
25 Instruments and Equipment
NOTE: all glassware and plasticware need to be soaked in nitric acid solution (1 + 4) overnight,
rinsed with water and reserved for later use.
25.1 Inductively coupled plasma optical emission spectrometer (ICP-OES).
25.2 Analytical balance: with a division value of 0.01 g and 0.1 mg, respectively.
25.3 Temperature-controllable electric hot plate.
25.4 Rotary evaporator.
25.5 Microporous filter membrane: hydrophilic PTFE, 0.45 m.
26 Analytical Procedures
26.1 Specimen Preparation
The preparation of 4% (volume fraction) acetic acid, 10% (volume fraction) ethanol, 20%
(volume fraction) ethanol, 50% (volume fraction) ethanol, 95% (volume fraction) ethanol, 1
g/L citric acid, 5 g/L citric acid, artificial tap water and isooctane specimen solution is the same
as 19.1.
26.2 Reference Conditions of Instrument
Under the working conditions of the selected instrument, make the indicators, for example,
sensitivity, of the elements to be determined reach the analysis requirements. Edit the
determination method and select the appropriate analytical spectral line for each element to be
determined. The reference conditions of instrument operation are shown in B.3.1 in Appendix
B. The recommended analytical spectral lines of the elements to be determined are shown in
Table B.6 in Appendix B.
26.3 Drawing of Standard Curve
Inject the mixed standard working solution into the inductively coupled plasma optimal
emission spectrometer. In accordance with the concentration from low to high, determine the
signal response values of the intensity of the analytical spectral lines of the elements to be
determined. Take the concentration of the element to be determined as the x-coordinate, and the
intensity response value of its analytical spectral line as the y-coordinate to draw a standard
curve.
26.4 Determination of Specimen Solution
......
GB 31604.49-2016
GB
NATIONAL STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
National food safety standard –
Food contact materials and articles –
Determination of arsenic, cadmium, chromium
and lead; migration of arsenic, cadmium,
chromium, nickel, lead, antimony and zinc
ISSUED ON. OCTOBER 19, 2016
IMPLEMENTED ON. APRIL 19, 2017
Issued by National Health and Family Planning Commission of the PRC
Table of contents
Foreword ... 3
1 Scope ... 4
Part I. Determination of arsenic, cadmium, chromium and lead Inductively
coupled plasma mass spectrometry ... 4
2 Principle... 4
3 Reagents and materials ... 4
4 Instruments and equipment ... 6
5 Analytical procedures ... 6
6 Expression of analytical results ... 8
7 Precision... 9
8 Others ... 9
Part II. Determination of migration quantity of arsenic, cadmium, chromium,
nickel, lead, antimony, and zinc ... 9
Method I. Inductively coupled plasma mass spectrometry ... 9
9 Principle... 9
10 Reagents and materials... 9
11 Instruments and equipment ... 11
12 Analytical procedures ... 11
13 Expression of analytical results ... 12
14 Precision ... 13
15 Others ... 13
Method II. Inductively coupled plasma - atomic emission spectrometry ... 13
16 Principle... 13
17 Reagents and materials... 13
18 Instruments and equipment ... 14
19 Analytical procedures ... 15
20 Expression of analytical results ... 15
21 Precision ... 15
22 Others ... 15
Appendix A Instrument reference working conditions and the recommended
mass-to-charge ratio or analysis wavelength of each element ... 17
Foreword
This standard replaces the determination of migration quantity of arsenic,
cadmium, chromium, nickel, lead, antimony and zinc as well as the content of
arsenic, cadmium, chromium, and lead in paper products and cork stoppers as
specified in SN/T 2829-2011 “Food contact materials for export - Metal
materials - Determination of migrant heavy metals in food simulant -
Inductively coupled plasma atomic emission spectrometric method”, SN/T
2597-2010 “Determination of lead, cadmium, chromium, arsenic, antimony,
germanium migration quantity in polymer for food contact materials -
Inductively coupled plasma atomic emission spectrometry method”, and SN/T
2594-2010 “Food contact materials - Determination of lead, cadmium,
chromium, and arsenic in cork stoppers by inductively coupled plasma mass
spectrometry”.
As compared with SN/T 2829-2011, SN/T 2597-2010 and SN/T 2594-2010, the
main changes of this standard are as follows.
- CHANGE the standard name into “National food safety standard - Food
contact materials and articles - Determination of arsenic, cadmium,
chromium and lead; migration of arsenic, cadmium, chromium, nickel, lead,
antimony and zinc”.
National food safety standard –
Food contact materials and articles –
Determination of arsenic, cadmium, chromium
and lead; migration of arsenic, cadmium,
chromium, nickel, lead, antimony and zinc
1 Scope
This standard specifies the inductively coupled plasma mass spectrometry and
inductively coupled plasma emission spectrometry for the determination of
arsenic, cadmium, chromium, nickel, lead, antimony and zinc in the food
contact materials and articles after being immersed in food simulants, AND
specifies the inductively coupled plasma mass spectrometry for the
determination of arsenic, cadmium, chromium and lead in paper products and
cork stoppers.
This standard applies to the determination of the migration quantity of arsenic,
cadmium, chromium, nickel, lead, antimony and zinc in various food contact
materials and articles, as well as the determination of arsenic, cadmium,
chromium and lead in paper products and cork stoppers.
Part I. Determination of arsenic, cadmium,
chromium and lead Inductively coupled
plasma mass spectrometry
2 Principle
Paper products and cork stoppers are crushed AND digested by nitric acid;
AND the solution obtained is diluted by water to make its volume reach to the
mark, determined by the inductively coupled plasma mass spectrometry, AND
compared with the standard series for quantitative purposes.
3 Reagents and materials
Unless otherwise stated, the reagents used in this method are of guarantee
reagent AND the water is level I water as specified in GB/T 6682.
3.1 Reagents
3.1.1 Nitric acid (HNO3).
WEIGH 0.5 g of the crushed sample (accurate to 0.1 mg); PLACE it in the
polytetrafluoroethylene digestion inner tank; ADD 5 mL ~ 8 mL of nitric acid;
COVER it and LET it stand for 1 h; SEAL the digestion tank and PLACE it in
the microwave digestion system; CONDUCT digestion in accordance with the
standard operation procedures of the microwave digestion instrument; AND it
may make reference to the digestion conditions in A.6 for digestion purposes.
After finishing the digestion, TAKE the digestion tank out of the digestion
instrument; when the digestion tank is completely cooled down, slowly OPEN
the inner cover; USE a small amount of water to rinse the inner cover for two
times; COMBINE the rinsing water into the digestion tank. PLACE the
digestion tank onto the temperature control heating plate at 140 °C to heat it for
30 min, or otherwise PLACE it into the ultrasonic water bath ultrasonic for
degassing for 5 min; TRANSFER all the digestion solution into a 50 mL
volumetric flask; USE water to make the volume reach to the mark; MIX it
uniformly; PREPARE for determination. And meanwhile MAKE the sample
blank.
5.2.2 Pressure sealed digestion
WEIGH 0.5 g of the pulverized sample (accurate to 0.1 mg); PLACE it in
polytetrafluoroethylene digestion inner tank; ADD 5 mL ~ 8 mL of nitric acid;
COVER and LET it stand for 1 h; SEAL the digestion inner tank into the
stainless steel outer tank; PLACE it into the constant temperature oven for
digestion; AND it may make reference to the digestion conditions of A.6 for
digestion. After finishing the digestion, when the digestion tank is completely
cooled down, slowly OPEN the inner cover; USE a small amount of water to
rinse the inner cover for two times; COMBINE the rinsing water into the
digestion tank. PLACE the digestion tank onto the temperature control heating
plate at 140 °C to heat it for 30 min, or otherwise PLACE it into the ultrasonic
water bath ultrasonic for degassing for 5 min; TRANSFER all the digestion
solution into a 50 mL volumetric flask; USE water to make the volume reach to
the mark; MIX it uniformly; PREPARE for determination. And meanwhile MAKE
the sample blank.
5.3 Instrument reference conditions
5.3.1 USE the instrument tuning use solution to optimize the working
conditions of the instrument, with the instrument reference conditions as
shown in A.1 AND the element reference analysis mode as shown in A.2.
Note. For instruments that do not have the appropriate interference elimination
mode, it is required to use the interference correction equation to correct the
determination results of arsenic, cadmium and lead. AND the interference
correction equation is as shown in A.3.
5.3.2 In the selected instrument working conditions, EDIT the determination;
SELECT the mass-to-charge ratio of the element to be determined and the
internal standard substance, with the reference conditions as shown in A.1 and
A.2.
10.1.1 Argon (Ar). purity ≥ 99.99%, or liquid argon.
10.1.2 Nitric acid (HNO3).
10.1.3 Helium (He). purity ≥ 99.995%.
10.1.4 Reagents required for preparing food simulant. in accordance with the
provisions of GB 31604.1.
10.2 Reagent preparation
10.2.1 Food simulant. PREPARE it in accordance with the provisions of GB
5009.156.
10.2.2 Nitric acid solution (5 + 95). MEASURE 50 mL of nitric aci...
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| Standard ID | GB 31604.49-2023 (GB31604.49-2023) | | Description (Translated English) | (National Food Safety Standards Food Contact Materials and Products Determination of Migration Amount of Benzophenones) | | Sector / Industry | National Standard | | Classification of Chinese Standard | X09 | | Word Count Estimation | 20,285 | | Date of Issue | 2023-09-06 | | Date of Implementation | 2024-03-06 | | Issuing agency(ies) | National Health Commission of the People's Republic of China, State Administration for Market Regulation | | Summary | This standard specifies the determination method for the migration of 8 benzophenones in food contact materials and products. The first method liquid chromatography is suitable for (2-hydroxy-4-methoxyphenyl) (2-hydroxyphenyl) methanone, 2,4-dihydroxybenzophenone, (2-hydroxy-4-methoxyphenyl)phenylmethanone, 4,4'-dihydroxybenzophenone, 2-hydroxy-4-n-octyloxy benzophenone, 2-hydroxy-4-n-hexyloxybenzophenone, benzophenone and 4,4'-difluorobenzophenone in water, 4% (volume fraction) acetic acid, 10% (volume fraction) ethanol, 20 (volume fraction) ethanol, 50 (volume fraction) ethanol food simulants, and chemical alternative solvents | | Standard ID | GB 31604.49-2016 (GB31604.49-2016) | | Description (Translated English) | National food safety standard -- Food contact materials and articles -- Migration of arsenic, cadmium, chromium, nickel, lead, antimony and zinc | | Sector / Industry | National Standard | | Classification of Chinese Standard | X09 | | Word Count Estimation | 14,142 | | Date of Issue | 2016-10-19 | | Date of Implementation | 2017-04-19 | | Older Standard (superseded by this standard) | SN/T 2829-2011 Partially; SN/T 2597-2010 Partially; SN/T 2594-2010 Partially | | Regulation (derived from) | State Health and Family Planning Commission Notice No.1516 of 2016 |
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