GB/T 5009.72-2003 English PDF (GBT5009.72-2003)

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GB/T 5009.72-2003: Method for analysis of hygienic standard of aluminum-wares for food use
GB/T 5009.72-2003
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 67.040
C 53
Replacing GB/T 5009.72-1996
Method for Analysis of Hygienic Standard of
Aluminum-wares for Food Use
ISSUED ON. AUGUST 11, 2003
IMPLEMENTED ON. JANUARY 1, 2004
Issued by. Ministry of Health of the People's Republic of China;
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 Arsenic ... 6 
8 Zinc ... 7 
9 Cadmium ... 8 
Foreword 
This Standard replaces GB/T 5009.72-1996 "Method for Analysis of Hygienic
Standard of Aluminum-wares for Food Use".
Compared with GB/T 5009.72-1996, the main changes of this Standard are as
follows.
— The framework of the previous standard was modified according to 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 responsibly drafted by the Epidemic Prevention Station of Guangxi
Zhuang Autonomous Region.
This Standard was issued in 1985 for the first time, and revised in 1996; this is the
second revision.
Method for Analysis of Hygienic Standard of
Aluminum-Wares for Food Use
1    Scope 
This Standard specifies the analysis methods for each hygienic index of various
punched or cast aluminum cookers, wares for food use, and vessels that directly
contact with foods.
This Standard is applicable to the analysis for each hygienic index of various punched
or cast aluminum cookers, wares for food use, and vessels that directly contact with
foods.
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 agreements 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 5009.11-2003 Determination of total arsenic and abio-arsenic in food
GB/T 5009.14-2003 Determination of zinc in foods
GB/T 5009.62-2003 Method for analysis of hygienic standard of ceramics for food
containers
GB 11333 Hygienic standard for aluminum-wares for food use
3    Sampling Method 
Sample 0.1% of the product as the inspection specimen; for small-batch production, it
shall not be less than 6 pieces for each time of sampling. Product name, batch
number, and sampling date shall be noted respectively. Half of the samples are used
for assay; and the other half are preserved two months for arbitrary analysis.
6.2.2 Analysis procedures
6.2.2.1 Take 25.00mL of refined aluminum sample soaking solution and 5.0 mL of
lead standard working solution (equivalent to 5.0μg of lead); respectively place in two
25mL colorimetrical cylinders with stoppers; operate according to Article 6.2.2 of GB/T
5009.62-2003.
6.2.2.2 Take 2.00mL of recycled aluminum sample soaking solution and 10mL of
lead standard working solution (equivalent to 10.00μg of lead); operate according to
Article 6.2.2 of GB/T 5009.62-2003.
6.2.3 Result calculation
The same as Article 6.2.3 in GB/T 5009.62-2003.
Result expression. Refined aluminum report is less than or greater than 0.2 mg/L;
recycled aluminum report is less than or greater than 5mg/L.
7    Arsenic   
7.1 Principle, Reagent and Instrument
The same as Method III in GB/T 5009.11-2003.
7.2 Analysis Procedures
Take 25.0mL of sample soaking solution; add the soaking solution into the
arsenic-measuring flask; add in 5mL of hydrochloric acid, 5mL of potassium iodide
solution, and 5 drops of acidic stannous chloride solution; shake up; stand for 10
minutes; add 2g of arsenic-free metallic zinc; immediately install the
arsenic-measuring tube that contains lead acetate cotton and mercuric bromide test
paper; place in the dark under 25°C ~ 30°C for 1 hour; take out the mercuric bromide
test paper; compare the test paper with the standard. The color spot shall not be
deeper than that of the standard.
Take 1.0mL of arsenic standard working solution (equivalent to 1.0 μg of arsenic); add
into the arsenic-measuring flask; add 5mL of acetic acid (4%) to 25mL; the following,
from "add in 5mL of hydrochloric acid", is operated at same time as the sample
soaking solution; this is standard arsenic spot.
7.3 Result Expression
Report is greater than or less than 0.04 mg/L.
8.6 Precision
The absolute difference between two independently-measured results under
repeatability condition shall not be greater than 10% of the arithmetic mean.
9    Cadmium   
9.1 Atomic Absorption Spectrometry
In accordance with Section 7.1 in GB/T 5009.62-2003.
9.2 Dithizone Method
9.2.1 Principle, reagent and instrument
The same as Article 7.2.1~7.2.3 in GB/T 5009.62-2003.
9.2.2 Analysis procedures
Take 2 125mL-separating funnels; add 0.1mL of cadmium standard working solution
(equivalent to 1 μg of cadmium) and 50.0 mL of acetic acid (4%) into one separating
funnel; add 50.0 mL of sample soaking solution into the other separating funnel;
respectively add 2mL of potassium sodium tartrate solution, 10mL of sodium
hydroxide-potassium cyanide solution, and 2mL of hydroxylamine hydrochloride
solution into each separating funnel. The solution shall be shaken up after adding
each kind of reagent. The following is operated according to Article 7.2.4 of GB/T
5009.62-2003 - from "add in 15.0mL of dithizone-chloroform solution (0.1g/L)”.
9.2.3 Result calculation
The same as Article 7.2.5 in GB/T 5009.62-2003.