GB/T 5009.62-2003 PDF in English
GB/T 5009.62-2003 (GB/T5009.62-2003, GBT 5009.62-2003, GBT5009.62-2003)
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Name of Chinese Standard | Status |
| GB/T 5009.62-2003 | English | 70 |
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Method for analysis of hygienic standard of ceramics for food containers
| Valid |
| GB/T 5009.62-1996 | English | 199 |
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Method for analysis of hygienic standard of ceramics for food containers
| Obsolete |
| GB 5009.62-1985 | English | 199 |
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Method for analysis of hygienic standard of ceramics for food containers
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Standards related to (historical): GB/T 5009.62-2003
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GB/T 5009.62-2003: PDF in English (GBT 5009.62-2003) GB/T 5009.62-2003
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 67.040
C 53
Replacing GB/T 5009.62-1996
Method for Analysis of Hygienic Standard of
Ceramics for Food Containers
ISSUED ON. AUGUST 11, 2003
IMPLEMENTED ON. JANUARY 1, 2004
Jointly issued by. Ministry of Public Health;
Standardization Administration of the People's
Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Sampling Method ... 4
4 Appearance Inspection and Sensory Index ... 5
5 Soaking Conditions ... 5
6 Lead ... 5
7 Cadmium ... 7
Foreword
This Standard replaces GB/T 5009.62-1996 "Method for Analysis of Hygienic
Standard of Ceramics for Food Containers".
Compared with GB/T 5009.62-1996, main changes of this Standard are as follows.
- The framework of the former standard is reformatted in accordance with GB/T
20001.4-2001 "Rules for Drafting Standards - Part 4. Methods of Chemical
Analysis".
This Standard was proposed by and shall be under the jurisdiction of the Ministry of
Health of the People's Republic of China.
This Standard was drafted by Guangdong Foshan Municipal Sanitation and
Anti-epidemic Station.
This Standard was first-time issued in 1985, and first-time revised in 1996. This is the
second-time revision.
Method for Analysis of Hygienic Standard of
Ceramics for Food Containers
1 Scope
This Standard specifies the analysis methods for each hygienic index of various
tableware, container and utensils which are made of ceramic and directly contact
food.
This Standard is applicable to the analysis for each hygienic index of various
tableware, container and utensils which are made of ceramic and directly contact
food.
2 Normative References
The following standards contain provisions which, through reference in this text,
constitute provisions of this Standard. For dated reference, subsequent amendments
(excluding corrigendum) or revisions of these publications do not apply. However, the
parties who enter into agreement based on this Standard are encouraged to
investigate the possibility of applying the most recent editions of the standards. For
undated references, the latest edition of the normative document referred to applies.
GB/T 5009.12-2003 Determination of Lead in Foods
GB 13121 Hygienic Standard of Ceramics for Food Containers
3 Sampling Method
Sample from each batch of the products with glaze colour floriation allocated.
Generally, the sampling quantity of small-batch shall not be less than 6. Product name,
batch number, and sampling date shall be indicated. If the sample is in small shape,
the sampling quantity may be increased in accordance with inspection requirements.
Half of the samples are used for assay, and the other half are preserved for two
months for arbitrary analysis.
Where,
X - The lead content in the soak solution, in mg/L;
As - Absorbance of lead standard solution;
m - Mass of lead standard solution, in μg;
At - absorbance of soak solution;
V - Volume of soak solution adopted, in millilitre (mL);
Expression of results. report that it is less than or larger than 7 mg/L.
7 Cadmium
7.1 Atomic absorption spectrometry
7.1.1 Principle
The cadmium ion in soak solution shall be led into the atomic absorption
spectrophotometer and atomized; absorb 228.8 nm resonance line; the absorbed
dose is proportional to the cadmium content; it shall be quantified through comparison
with the standard series.
7.1.2 Reagent
7.1.2.1 Cadmium standard solution. accurately weigh out 0.1142 g of cadmium
oxide; add 4 mL of glacial acetic acid; dissolve them by slowly heating; cool it down;
transfer the solution into a 100mL volumetric flask; dilute with water to the scale; 1mL
of this solution is equivalent to 1.00 mg of cadmium.
7.1.2.2 Standard cadmium working solution. suck 1.0 mL of standard cadmium
solution; pour it into a 100 mL volumetric flask; dilute it with acetic acid (4%) to the
scale. Per millilitre of this solution is equivalent to 10.0 μg of cadmium.
7.1.3 Instrument
Atomic absorption spectrophotometer.
7.1.4 Analysis procedure
7.1.4.1 Preparation of standard curve. suck 0mL, 0.50mL, 1.00mL, 3.00mL, 5.00mL,
7.00 mL and 10.00 mL of standard cadmium working solution respectively; pour them
into 100ml volumetric flasks respectively; dilute with acetic acid (4%) to the scale; mix
uniformly; per millilitre of these solutions are equivalent to 0μg, 0.05μg, 0.10μg,
0.30μg, 0.50μg, 0.70μg and 1.00 μg of cadmium respectively. Calibrate the atomic
7.2.2.2 Sodium hydroxide-potassium cyanide solution (No. 1). Weigh out 400 g of
sodium hydroxide and 10 g of potassium cyanide; dissolve them in water; dilute to
1000ml.
7.2.2.3 Sodium hydroxide-potassium cyanide solution (No. 2). Weigh out 400 g of
sodium hydroxide and 0.5 g of potassium cyanide; dissolve them in water, dilute to
1000ml.
7.2.2.4 Dithizone-trichloromethane solution (0.1g/L).
7.2.2.5 Dithizone-trichloromethane solution (0.02 g/L).
7.2.2.6 Sodium potassium tartrate solution (250 g/L).
7.2.2.7 Hydroxylamine hydrochloride solution (200 g/L).
7.2.2.8 Tartaric acid solution (20 g/L). store it in refrigerator.
7.2.2.9 Standard cadmium working solution. the same as 7.1.2.2.
7.2.3 Instrument
Visible spectrophotometer.
7.2.4 Analysis procedure
Take two piece of 125 mL separating funnels; add 0.5 mL of standard cadmium
working solution (equivalent to 5 μg of cadmium) and 9.5 mL of acetic acid (4%) into
one separating funnel; add 10mL of sample soak solution into the other one. Add 1 mL
of sodium potassium tartrate solution, 5 mL of sodium hydroxide-potassium cyanide
solution (No. 1), and 1 mL of hydroxylamine hydrochloride solution into the two
separating funnels respectively. Shake the solution uniformly after adding all reagents
above. Add 15mL of dithizone-trichloromethane solution (0.1 g/L); shake for 2min (this
step shall be rapidly conducted). Take another set of separating funnels; add 25mL of
tartaric acid solution respectively; pour the dithizone-trichloromethane solution in the
former set of separating funnels into the latter set of separating funnels; wash the
former set of separating funnels with 10mL of trichloromethane; pour the
trichloromethane cleaning solution into the latter set of separating funnels. Shake the
latter set of separating funnels for 2min; discard the dithizone-trichloromethane
solution; add 6 mL of trichloromethane respectively; shake and discard the
trichloromethane layer. Add 1.0 mL of hydroxylamine hydrochloride solution; 15.0 mL
of dithizone-trichloromethane solution (0.02 g/L) and 5 mL of sodium
hydroxide-potassium cyanide solution (No.2) into the aqueous solution in separating
funnels respectively; shake immediately for 2min. Wipe and dry the internal wall of the
lower pipe of separating funnels; insert a small amount of absorbent cotton in order to
filter the globule. Pour the dithizone-trichloromethane solution into the 25mL
colorimeter tubes-with-plugs, and conduct colour comparison. The degree of red of
sample tube must not be larger than that of the standard tube. Otherwise, calibrate
the zero point of 3 cm cuvette with trichloromethane; measure the absorbance at point
where the wave length is 518 nm; and conduct quantitation.
7.2.5 Result Calculation
It shall be the same as 6.2.3.
7.2.6 Accuracy
It shall be the same as 6.1.4.
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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