GB 31604.38-2016 PDF English
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National food safety standard - Food contact materials and articles - Determination of arsenic and migration
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GB 31604.38-2016: National food safety standard - Food contact materials and articles - Determination of arsenic and migration
---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/GB31604.38-2016
GB
NATIONAL STANDARD
National food safety standard
Food contact materials and articles –
Determination of arsenic and migration
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
2 Principles... 4
3 Reagents and materials... 4
4 Instrument and equipment... 6
5 Analytical procedures... 6
6 Expression of analysis results... 7
7 Precision... 8
8 Others... 8
9 Principles... 8
10 Reagents and materials... 8
11 Instruments and equipment... 10
12 Analytical procedures... 10
13 Expression of analysis results... 11
14 Precision... 11
15 Others... 11
Foreword
This standard replaces the determination of arsenic and in the GB/T
5009.68-2003 “Method for analysis of hygienic standard of
perchlorovinyl-coating for inner wall of food container”, GB/T 5009.72-2003
“Method for analysis of hygienic standard of aluminum-wares for food use”,
GB/T 5009.78- 2003 “Method for analysis of hygienic standard of papers for
food packaging”, GB/T 5009.81-2003 “Method for analysis of hygienic
standard of stainless steel food containers and table wares”, SN/T 2900-2011
“Food contact materials for export - Paper, recycled fiber materials –
Determination of arsenic – Atomic fluorescence spectrometry”, SN/T
2594-2010 “Food contact materials – Determination of lead, cadmium,
chromium, and arsenic in cork stoppers by inductively coupled plasma mass
spectrometry”, 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 - Metallic materials -
Determination of migrant heavy metals in food simulant - Inductively coupled
plasma atomic emission spectrometric method”.
As compared with GB/T 5009.68-2003, 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 arsenic and migration”;
- ADD the arsenic determination;
- ADD the inductively coupled plasma mass spectrometry;
- ADD the inductively coupled plasma emission spectroscopy;
- DELETE the silver salt method and the arsenic spot method.
National food safety standard
Food contact materials and articles –
Determination of arsenic and migration
1 Scope
This standard specifies the hydride atomic fluorescence spectrometry,
inductively coupled plasma mass spectrometry, and inductively coupled
plasma emission spectroscopy for the determination of arsenic migration of the
food contact materials and articles after soaked in the food simulants as well
as the determination of arsenic in the paper articles and cork stoppers.
This standard applies to determination of the arsenic migration in the food
contact materials and articles as well as the determination of arsenic in the
paper articles and cork stoppers.
Part 1.Determination of arsenic
Method 1.Hydride atomic fluorescence spectrometry
2 Principles
Paper products and cork stoppers are crushed AND then subjected to dry ash
digestion, thiourea is added to the digestion solution to pre-reduce the
pentavalent arsenic to trivalent arsenic, which reacts with the reduction
hydrogen to produce the arsenic hydride; the arsenic hydride is carried by the
argon into the quartz atomizer AND decomposed into atomic arsenic, which
generates the atomic fluorescence under the excitation light of the arsenic
hollow cathode lamp. The fluorescence intensity is proportional to the arsenic
concentration in the measured solution, AND it is quantified through
comparison with the standard series.
3 Reagents and materials
Unless otherwise specified, the reagents used in this method are of analytical
pure AND the water is the level II water as specified in GB/T 6682.
3.1 Reagents
3.1.1 Potassium hydroxide (KOH).
3.1.2 Potassium borohydride (KBH4).
3.1.8 Magnesium oxide (MgO).
3.2 Reagent preparation
3.2.1 Potassium hydroxide solution (5 g/L). WEIGH 5 g of potassium hydroxide;
USE water to dilute it to 1000 mL; MIX it uniformly.
3.2.2 Potassium borohydride alkaline solution (10 g/L). WEIGH 10 g of
potassium borohydride; USE potassium hydroxide solution (5 g/L) to dissolve it;
3.2.3 Pre-reducing agent solution. WEIGH 5.0 g of thiourea; ADD about 80 mL
of water to dissolve it; ADD 5.0 g of ascorbic acid; after it is completely
dissolved, USE water to dilute it to 100 mL; MIX it uniformly; AND this solution
shall be prepared before use.
3.4 Standard solution preparation
3.4.1 Arsenic standard stock solution (1000 mg/L). USE the standard solution
certified by the state AND awarded with the standard substance certificate, or
PREPARE it in accordance with the requirements of GB/T 602.
3.4.2 Arsenic standard intermediate (1.00 mg/L). accurately PIPETTE 10.0 mL
of arsenic standard stock solution into a 100 mL volumetric flask; ADD the
hydrochloric acid solution (5 + 95) to the mark;
4 Instrument and equipment
4.1 Atomic fluorescence photometer. with arsenic hollow cathode lamp.
4.2 Muffle furnace.
4.3 Analytical balance. sensitivity of 1 mg.
5 Analytical procedures
5.1 Pretreatment of sample
TAKE appropriate amount of sample; CRUSH it and MIX it uniformly. WEIGH 1
g ~ 3 g of sample (accurate to 0.001 g); PLACE it in a crucible with cover; ADD
10 mL of magnesium nitrate solution (150 g/L);
5.2 Determination
5.2.1 Instrument test conditions
ADJUST the performance of the instrument to the best condition, AND the
instrument reference conditions are as follows. photomultiplier tube voltage.
400 V; arsenic hollow cathode lamp current. 35 mA; atomizer. temperature
820 °C ~ 850 °C; height. 8 mm; argon flow rate. carrier gas 400m L/min.
5.2.3 Sample determination
TAKE 20 mL of the sample digestion solution into a 25 mL colorimetric tube;
ADD 5 mL of pre-reducing agent solution; MIX it uniformly; PLACE it for 30 min;
MAKE determination on the instrument; QUANTIFY it by comparison with the
standard series; and meanwhile MAKE the blank test.
6 Expression of analysis results
The arsenic content in the sample is calculated in accordance with the formula
7 Precision
The absolute difference between the two independent determinations obtained
under repeatability shall not exceed 20% of the arithmetic mean.
8 Others
When calculated using the sample amount of 0.5 g and the constant volume of
25 mL, the method detection limit is 0.05 mg/kg AND the limit of quantification
is 0.15 mg/kg.
9 Principles
The food simulant is used to soak the portion of the food contact materials and
products which are expected to contact with the food part, thiourea is added to
the soaking solution to pre-reduce the pentavalent arsenic to trivalent arsenic,
which reacts with the reduction hydrogen to produce the arsenic hydride;
10 Reagents and materials
Unless otherwise specified, the reagents used in this method are of analytical
pure AND the water is the level II water as specified in GB/T 6682.
10.1 Reagents
10.2 Reagent preparation
10.2.1 Potassium hydroxide solution (5 g/L). WEIGH 5 g of potassium
hydroxide; USE water to dilute it to 1000 mL; MIX it uniformly.
10.2.2 Potassium borohydride alkaline solution (10 g/L). WEIGH 10 g of
potassium borohydride; USE potassium hydroxide solution (5 g/L) to dissolve it;
MAKE its volume reach to 1000 mL; AND this solution shall be prepared before
use.
10.4 Standard solution preparation
10.4.1 Arsenic standard stock solution (1000 mg/L). USE the standard solution
certified by the state AND awarded with the standard substance certificate, or
PREPARE it in accordance with the requirements of GB/T 602.
10.4.2 Arsenic standard intermediate (1.00 mg/L). accurately PIPETTE 10.0
mL of arsenic standard stock solution into a 100 mL volumetric flask; ADD the
hydrochloric acid solution (5 + 95) to the mark; MIX it uniformly. And then
accurately PIPETTE 1.00 mL of this arsenic standard solution into a 100 mL
volumetric flask; ADD hydrochloric acid solution (5 + 95) to the mark; MIX it
uniformly.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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