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GB 1886.223-2016 PDF in English


GB 1886.223-2016 (GB1886.223-2016) PDF English
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GB 1886.223-2016: PDF in English

GB 1886.223-2016
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
National food safety standard - Food additives -
Seduction red aluminum lake
[Translator note: Allura red aluminum lake]
ISSUED ON: AUGUST 31, 2016
IMPLEMENTED ON: JANUARY 01, 2017
Issued by: Health and Family Planning Commission of PRC
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Chemical name and relative molecular weight ... 4 
3 Technical requirements ... 4 
Appendix A Testing method ... 6 
Appendix B Preparation method of titanium trichloride standard titration solution
... 12 
National food safety standard - Food additives -
Seduction red aluminum lake
1 Scope
This standard is applicable to the food additive - seduction red aluminum lake,
which is prepared by lake-forming the food additives seduction red and
aluminum salt, as raw materials.
2 Chemical name and relative molecular weight
2.1 Chemical name
Aluminum lake of 6-hydroxy-5-[(2-methoxy-5-methyl-4-sulfobenzene) azo]-2-
naphthalenesulfonic acid disodium salt
2.2 Relative molecular mass
496.42 (in terms of seduction red) (according to 2013 international relative
atomic mass)
3 Technical requirements
3.1 Sensory requirements
Sensory requirements shall meet the requirements of Table 1.
Table 1 -- Sensory requirements
3.2 Physical and chemical indicators
The physical and chemical indicators shall meet the requirements of Table 2.
Appendix A
Testing method
A.1 Safety tips
Some reagents, which are used in the test methods of this standard, are toxic
or corrosive; therefore, appropriate safety and protective measures shall be
taken during operation.
A.2 General provisions
The reagents and water, which are used in this standard, refer to analytical pure
reagents and the grade-3 water, which is specified in GB/T 6682, unless
otherwise specified. The standard solutions used in the test, standard solutions
for impurity determination, preparations and products, are prepared in
accordance with GB/T 601, GB/T 602, GB/T 603, unless otherwise specified.
The solution, which is used in the test, refers to an aqueous solution, when it is
not specified which solvent is used to prepare it.
A.3 Identification test
A.3.1 Reagents and materials
A.3.1.1 Sulfuric acid solution: 1+20.
A.3.1.2 Hydrochloric acid solution: 1+4.
A.3.1.3 Sodium hydroxide solution: 100 g/L.
A.3.1.4 Ammonium acetate solution: 1.5 g/L.
A.3.1.5 Activated carbon.
A.3.2 Instruments and equipment
A.3.2.1 Spectrophotometer.
A.3.2.2 Cuvette: 10 mm.
A.3.3 Analytical procedures
A.3.3.1 Color reaction
Weigh about 0.1 g of specimen. Add 5 mL of sulfuric acid solution. Shake
continuously in a water bath. Heat for about 5 min. The solution turns red. After
cooling, take 2 ~ 3 drops of the upper clear liquid. ADD 5 mL of water, which is
still red.
A.3.3.2 Aluminum salt reaction
Weigh about 0.1 g of specimen. Add 5 mL of hydrochloric acid solution. Heat it
in a water bath, to dissolve most of it. Add 0.5 g of activated carbon. Shake well.
Filter it after cooling. Take the colorless filtrate. Add sodium hydroxide solution
to neutralize it, which shows aluminum salt reaction.
A.3.3.3 Maximum absorption wavelength
Weigh about 0.1 g of the specimen. Add 5 mL of sulfuric acid solution. Heat to
dissolve in a water bath. Stir thoroughly. Add ammonium acetate solution to
make up to 100 mL. Perform centrifugal separation, when the solution is not
clear. Then take 1 mL ~ 5 mL of this solution. Add ammonium acetate solution,
to make up to 100 mL. Make the measured absorbance in the range of 0.3 ~
0.7. The maximum absorption wavelength of the solution is 497 nm ~ 501 nm.
A.4 Determination of seduction red content
A.4.1 Titanium trichloride titration method (arbitration method)
A.4.1.1 Method summary
In acidic medium, seduction red is reduced and decomposed by titanium
trichloride; its content is calculated according to the consumption of titanium
trichloride standard titration solution.
A.4.1.2 Reagents and materials
A.4.1.2.1 Sodium hydrogen tartrate.
A.4.1.2.2 Titanium trichloride standard titration solution: c(TiCl3) = 0.1 mol/L
(prepared before use, see Appendix B for the preparation method).
A.4.1.2.3 Sulfuric acid solution: 1+20.
A.4.1.2.4 Carbon dioxide: Content ≥ 99%.
A.4.1.3 Instruments and equipment
The device diagram of the titanium trichloride titration method is as shown in
Figure A.1.
consumed by titrating the specimen, in milliliters (mL);
c - The concentration of titanium trichloride standard titration solution, in
moles per liter (mol/L);
M - The molar mass of seduction red, in grams per mole (g/mol) [M
(C18H14N2Na2O8S2) = 496.42];
m - The mass of specimen, in grams (g);
1000 - Volume conversion factor;
4 - Mole conversion factor.
The test results are based on the arithmetic mean of the parallel determination
results (keeping 1 decimal place). The absolute difference, between two
independent determination results, which are obtained under repeatability
conditions, is not more than 1.0% of the arithmetic mean.
A.4.2 Spectrophotometric colorimetry
A.4.2.1 Method summary
After dissolving the sample and the seduction red standard with known content
in water, respectively, measure the absorbance at the maximum absorption
wavelength; then calculate the content.
A.4.2.2 Reagents and materials
A.4.2.2.1 Ammonium acetate solution: 1.5 g/L.
A.4.2.2.2 Suction red standard product: Content ≥ 85.0% (determined in
accordance with A.4.1).
A.4.2.2.3 Sulfuric acid solution: 1+20.
A.4.2.3 Instruments and equipment
A.4.2.3.1 Spectrophotometer.
A.4.2.3.2 Cuvette: 10 mm.
A.4.2.4 Preparation of seduction red standard solution
Weigh about 0.5 g of seduction red standard product (accurate to 0.0001 g).
Dissolve it in an appropriate amount of water. Transfer it into a 1000 mL
volumetric flask. Add water to dilute to the mark. Shake well. Accurately pipette
10 mL into a 500 mL volumetric flask. Add ammonium acetate solution to dilute
to the mark. Shake well. Prepare for use (the absorbance value, at the
Appendix B
Preparation method of titanium trichloride standard titration
solution
B.1 Reagents and materials
B.1.1 Hydrochloric acid.
B.1.2 Ferrous ammonium sulfate.
B.1.3 Ammonium thiocyanate solution: 200 g/L.
B.1.4 Sulfuric acid solution: 1+1.
B.1.5 Titanium trichloride solution.
B.1.6 Standard titration solution of potassium dichromate:
B.2 Instrument and equipment
The diagram of the titration device is as shown in Figure A.1.
B.3 Preparation of titanium trichloride standard titration solution
B.3.1 Preparation
Take an appropriate amount of titanium trichloride solution and 75 mL of
hydrochloric acid. Place them in a 1000 mL brown volumetric flask. Use the
freshly boiled water, that has been cooled to room temperature, to dilute to the
mark. Shake well. Immediately pour it into a light-proof lower-opening flask.
Store under protection of carbon dioxide gas.
B.3.2 Calibration
Weigh about 3 g (accurate to 0.0001 g) of ferrous ammonium sulfate. Place it
in a 500 mL conical flask. Under the protection of carbon dioxide gas flow, add
50 mL of freshly boiled cooled water, to dissolve it. Then add 25 mL of sulfuric
acid solution. Continue to lead in the carbon dioxide gas flow, under the liquid
surface, for protection. Quickly and accurately add 35 mL of potassium
dichromate standard titration solution. Then use the titanium trichloride
standard solution, to be calibrated, to titrate it, until approaching the end of the
calculated amount. Immediately add 25 mL of ammonium thiocyanate solution.
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.