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GB 8058-2003: Standard permissible limits and testing method for release of lead or cadmium from ceramic cookware
GB 8058-2003
ICS 81.060.01
Y 20
GB
National Standard
of the People’s Republic of China
eqv ISO 8391-1.1986
eqv ISO 8391-2.1986
Replacing GB 8058-1987
Standard permissible limits and testing method
for release of lead or cadmium from ceramic
cookware
ISSUED ON. JUNE 13, 2003
IMPLEMENTED ON. DECEMBER 1, 2003
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Reference standards ... 4
3 Definitions... 4
4 Permissible limits ... 5
5 Detection methods ... 5
6 Precision ... 9
7 Test report ... 9
Foreword
Chapter 4 of this Standard is mandatory content, the rest are recommended
content.
This Standard is the revision of GB 8058-1987 "Standard permissible limits and
testing method for release of lead or cadmium from ceramic cookware".
This Standard equivalently adopts international standards ISO 8391-1.1986
"Ceramic cookware in contact with food - Release of lead and cadmium - Part 1.
Method of test" and ISO 8391-2.1983 "Ceramic cookware in contact with food -
Release of lead and cadmium - Part 2. Permissible limits".
This Standard makes the following modifications to the technical content of GB
8058-1937.
- TIGHTEN the permissible limit indicators in Chapter 4;
- DELETE the Chapters 3, 5, 4, 2 of original standard;
- DEFINE more specific provisions about atomic absorption spectrophotometer.
This Standard was proposed by China Light Industry Federation.
This Standard shall be administrated by National Ceramic Standardization
Center.
Drafting organizations of this Standard. Ceramic Research Institute of Light
Industry, Jingdezhen University, and Jingdezhen Ceramic Institute.
Main drafters of this Standard. Shen Wei, Yao Jilie, Chen Benxing, Yu Jinbao,
and Yu Xiaoqin.
This Standard was first released in June 1987.
From the date of implementation of this Standard, it shall replace GB
8058-1987.
Standard permissible limits and testing method for
release of lead or cadmium from ceramic cookware
eqv ISO 8391-1.1986
eqv ISO 8391-2.1986
Replacing GB 8058-1987
1 Scope
This Standard specifies the standard permissible limits and testing method for
release of lead or cadmium from ceramic cookware.
This Standard applies to casserole, boiler, hot pot, wok, heating pot and other
kinds of ceramic cooking products in contact with food.
2 Reference standards
The following standards contain provisions which, through reference in this
Standard, become provisions of this Standard. At time of publication, the
editions indicated are valid. All standards are subject to revision. The parties
who are using this Standard shall explore the possibility of using the latest
version of the following standards.
GB/T 6682-1992 Water for analytical laboratory use - Specification and test
methods (neq ISO 3696. 1987)
3 Definitions
This Standard uses the following definition.
3.1
Ceramic cookware
The ceramic products that are used to heat and prepare food, but excluding
scale. SHAKE it well.
5.3.2 100mg/L of lead standard solution
Accurately TRANSFER 10mL of lead standard solution of which the
concentration is 1000mg/L INTO 100-mL volumetric flask. DELUTE it with 4%
acetic acid solution until it reaches the scale. SHAKE it well.
5.3.3 Series of lead standard solutions
Accurately TRANSFER 0.0, 0.5, 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0mL of lead
standard solutions of which the concentration is 100mg/L. And PLACE them in
100-mL volumetric flasks respectively. DELUTE them with 4% acetic acid
solution until they reach the scale. SHAKE well. The solutions contain 0.0, 0.5,
1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0μg lead per milliliter respectively. REPLACE it by
new solutions after being used for 4 weeks.
5.3.4 1000mg/L of cadmium standard solution
WEIGH and TAKE 1.1423g of cadmium oxide which has been baked at
(105~110)ºC for 2h, accurate to 0.0001g. PLACE it in 400-mL beaker. Warmly
DISSOLVE it with 40mL of glacial acetic acid. COOL it down. MOVE it in
1000-mL volumetric flask. DILUTE it with distilled water until it reaches the
scale. SHAKE it well.
5.3.5 10mg/L of cadmium standard solution
Accurately TRANSFER 10mL of cadmium standard solution of which the
concentration is 1000mg/L INTO 1000-mL volumetric flask. DILUTE it with 4%
acetic acid solution until it reaches the scale. SHAKE it well.
5.3.6 Series of cadmium standard solutions
Accurately TRANSFER 0.00, 0.50, 1.00, 2.00, 3.00, 4.00, 5.00mL of cadmium
standard solutions of which the concentration is 10mg/L. And PLACE them in
100-mL volumetric flasks respectively. DILUTE them with 4% acetic acid
solution until they reach the scale. SHAKE well. The solutions contain 0.00,
0.05, 1.00, 2.00, 3.00, 4.00, 5.00μg cadmium per milliliter respectively.
REPLACE it by new solution after being used for 4 weeks.
from the standard curve directly.
5.5.4.2 Close interpolation method
According to the solution’s probable content, TAKE upper-and-lower closely
adjacent standard solution and test sample solution, and COMPARE and
determine at the same time. WRITE down the reading values of absorbance (A)
of each solution for three times or more. TAKE the average value. CALCULATE
by the formula (2).
...(2)
In the formula. C -- Absorbance of lead or cadmium in extract liquor;
A1 -- Absorbance of standard solution with lower concentration;
A2 -- Absorbance of standard solution with higher concentration;
C1 -- Concentration of standard solution with lower concentration, mg/L;
C2 -- Concentration of standard solution with higher concentration, mg/L.
6 Precision
The results of lead shall be accurate to 0.1mg/L;
The results of cadmium shall be accurate to 0.01mg/L.
7 Test report
The test report shall include the following content.
a) Application organization, submission date, inspection nature;
b) Sample’s name, serial number, and required inspection items;
c) Name and number of inspection standard;
d) Inspection result;
e) Inspector, inspector’s signature, and seal of inspection organization;
f) Reporting date of inspection result;
g) Other explanations relevant to inspection result.