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GB 31604.24-2016National food safety standard - Food Contact Materials and Articles - Determination of cadmium migration quantity (English PDF)

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Issued by

National Health and Family Planning Commission of the PRC

Level / Type

National · Mandatory

Issue date

October 19, 2016

Implementation date

April 19, 2017

Scope

GB 31604.24-2016 (National food safety standard - Food Contact Materials and Articles - Determination of cadmium migration quantity) is available as an English-translated PDF.

GB 31604.24-2016 — This standard specifies the determination of cadmium migration quantity after immersion of food contact materials and articles in food simulants by graphite furnace atomic absorption spectrometry, inductively coupled plasma mass spectrometry, inductively coupled plasma emission spectroscopy, and flame atomic absorption spectrometry.

This standard applies to the determination of cadmium migration quantity in food contact materials and articles. Method I. Graphite furnace atomic absorption spectrometry

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Document preview — GB 31604.24-2016

National Standard of the People's Republic of China

Issued by: National Health and Family Planning Commission of the PRC

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...7
7 Precision...7
8 Other...7
9 Principles...8
10 Reagents and materials...8
11 Instruments and equipment...9
12 Analytical procedures...9
13 Analysis results expression...10
14 Precision...10
15 Other...10

Foreword

This standard instead of GB/T 5009.62-2003 "Method for analysis of hygienic

standard of ceramics for food containers", GB/T 5009.63-2003 "Method for

analysis of hygienic standard of enamel for food containers", GB/T

5009.72-2003 "Method for analysis of hygienic standard of aluminum-wares for

food use", GB/T 5009.81-2003 "Method for analysis of hygienic standard of

stainless steel food containers and table wares", GB/T 3534-2002 "Standard

testing methods for lead and cadmium release from domestic ceramic", GB

8058-2003 "Standard permissible limits and testing method for release of lead

or cadmium from ceramic cookware", GB/T 21170-2007 "Glass hollowware -

Test method for lead and cadmium release", 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", 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 2886-2011 2011 "Food contact materials for export - Determination of

lead and cadmium in glass container simulant - Flame atomic absorption

spectrometry method".

As compared with GB/T 5009.62-2003, 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 cadmium migration

quantity";

- ADD the graphite furnace atomic absorption spectrometry;

- ADD the inductively coupled plasma mass spectrometry;

- ADD the inductively coupled plasma emission spectrometry;

- DELETE the dithizone colorimetric method.

National Food Safety Standard

Food Contact Materials and Articles –

Determination of cadmium migration quantity

1 Scope

This standard specifies the determination of cadmium migration quantity after

immersion of food contact materials and articles in food simulants by graphite

furnace atomic absorption spectrometry, inductively coupled plasma mass

spectrometry, inductively coupled plasma emission spectroscopy, and flame

atomic absorption spectrometry.

This standard applies to the determination of cadmium migration quantity in

food contact materials and articles.

Method I. Graphite furnace atomic absorption spectrometry

2 Principles

USE the food simulant to soak the portion of the food contact materials and

articles which is expected to contact with the food; MAKE the soaking solution

be subjected to graphite furnace atomization; AND the absorbance value

determined at 228.8 nm is proportional to the cadmium content within a certain

concentration range; COMPARE it with the standard series for quantitation.

3 Reagents and materials

Unless otherwise noted, 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

3.2.1 Food simulant. PREPARE it in accordance with the provisions of GB

5009.156.

3.2.2 Nitric acid solution (1+9). MEASURE 10 mL of nitric acid; ADD it into 90

mL of water; MIX it uniformly.

3.2.3 Nitric acid solution (5+95). PIPETTE 50 mL of nitric acid into 950 mL of

water; MIX it uniformly.

3.2.4 Ammonium dihydrogen phosphate solution (20 g/L). WEIGH 2.0 g of

ammonium dihydrogen phosphate; USE water to dissolve it; MAKE its volume

reach to 100 mL.

3.3 Standard substance

Cadmium chloride (, CAS number. 7790-78-5). Purity >

99.99%, OR the cadmium standard solution as certified nationally and

awarded with standard substance certificate.

3.4 Standard solution preparation

3.4.1 Cadmium standard stock solution (100.0 mg/L). Accurately WEIGH

0.2032 g (accurate to 0.0001 g) of cadmium chloride; USE a small amount of

nitric acid solution (1+9) to dissolve it; TRANSFER it into a 1000 mL volumetric

flask; ADD water to the mark; MIX it uniformly.

3.4.2 Cadmium standard intermediate (100 µg/L). PIPETTE 1.00 mL of

cadmium standard stock solution into a 1000 mL volumetric flask; ADD nitric

acid solution (5+95) to the mark; MIX it uniformly.

4 Instruments and equipment

Note. All glassware need to be soaked in nitric acid solution (1+5) overnight,

repeatedly rinsed with tap water, and finally washed clean with water.

4.1 Graphite furnace atomic absorption spectrometer.

5 Analytical procedures

5.1 Sample pre-treatment

According to the expected use and conditions of use of the sample to be tested,

CONDUCT the migration test in accordance with the migration test method

and test conditions as specified in GB 5009.156 and GB 31604.1.

5.2 Determination

5.2.1 Instrument reference conditions

The instrument reference conditions are as shown in Table A.

5.2.2 Standard curve making

In the order of concentration from low to high, respectively PIPETTE 10 µL of

cadmium standard series solution and 5 µL of ammonium dihydrogen

phosphate solution (20 g/L) (the optimum injection volume can be determined

according to the instrument used);

6 Analysis results expression

OBTAIN the cadmium concentration from the standard curve; after deducting

the blank value, CALCULATE the migration quantity in accordance with GB

5009.156,

7 Precision

The absolute difference between the two independent determinations obtained

under repeatability conditions shall not exceed 20% of the arithmetic mean.

8 Other

The method detection limit is 0.03 µg/L AND the quantification limit is 0.1 µg/L.

Method II.

9 Principles

USE the food simulant to soak the portion of the food contact materials and

articles which is expected to contact with the food; MAKE the soaking solution

be subjected to flame atomization;

10 Reagents and materials

Unless otherwise noted, the reagents used in this method are excellent grade

pure AND the water is level II water as specified in GB/T 6682.

10.1 Reagents

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 (1+9). MEASURE 50 mL of nitric acid; ADD it into

450 mL of water; MIX it uniformly.

10.2.3 Nitric acid solution (5+95). PIPETTE 50 mL of nitric acid into 950 mL of

water; MIX it uniformly.

10.3 Standard substance

Cadmium chloride (, CAS number. 7790-78-5). Purity >

99.99%, OR the cadmium standard solution as certified nationally and

awarded with standard substance certificate.

10.4 Standard solution preparation

11 Instruments and equipment

Note. All glassware need to be soaked in nitric acid solution (1+5) overnight,

repeatedly rinsed with tap water, and finally washed clean with water.

11.1 Flame atomic absorption spectrometer. It is equipped with flame atomizer

and cadmium hollow cathode lamp.

11.2 Analytical balance. The sensitivity is of 0.1 mg.

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 10 pages — is available in the English PDF.

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