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GB 1886.357-2022 PDF in English


GB 1886.357-2022 (GB1886.357-2022) PDF English
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GB 1886.357-2022: PDF in English

GB 1886.357-2022
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
National food safety standard - Food additive - Pigment blue
ISSUED ON: JUNE 30, 2022
IMPLEMENTED ON: DECEMBER 30, 2022
Issued by: National Health Commission;
State Administration for Market Regulation.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Molecular formula, relative molecular mass ... 4 
3 Technical requirements ... 4 
Appendix A Inspection method ... 5 
Appendix B Preparation method of titanium trichloride standard titration solution .. 11 
National food safety standard - Food additive - Pigment blue
1 Scope
This standard is applicable to the food additive - pigment blue, which is made from
food additive pigment blue and aluminum salt as raw materials, through color lake.
2 Molecular formula, relative molecular mass
2.1 Molecular formula
C16H8N2Na2O8S2 (Pigment blue)
2.2 Relative molecular mass
466.35 (in pigment blue) (according to 2018 international relative atomic mass)
3 Technical requirements
3.1 Sensory requirements
Sensory requirements shall meet the requirements of Table 1.
3.2 Physical-chemical indicators
Physical-chemical indicators shall meet the requirements of Table 2.
Appendix A
Inspection method
A.1 General provisions
The reagents and water, which are used in this standard, refer to analytically pure
reagents and grade-3 water, as specified in GB/T 6682, unless otherwise specified. The
standard titration solution, standard solution for impurity determination, preparations
and products, which are used in the test, shall be prepared in accordance with the
provisions of GB/T 601, GB/T 602, GB/T 603, unless otherwise specified. The solution,
which is used in the test, refers to the aqueous solution, unless otherwise specified.
A.2 Identification test
A.2.1 Reagents and solutions
A.2.1.1 Sulfuric acid solution: 1 + 20.
A.2.1.2 Hydrochloric acid solution: 1 + 4.
A.2.1.3 Sodium hydroxide solution: 100 g/L.
A.2.1.4 Ammonium acetate solution: 3.4 g/L.
A.2.2 Instruments and equipment
A.2.2.1 Spectrophotometer.
A.2.2.2 Cuvette: 10 mm.
A.2.3 Analytical procedures
A.2.3.1 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 blue purple. After cooling, take
2 ~ 3 drops of the upper clear liquid. Add 5 mL of water, it shall still be blue purple.
A.2.3.2 Aluminum salt reaction
Weigh about 0.1 g of specimen. Add 5 mL of sodium hydroxide solution. Heat in a
water bath for 5 min. Shake from time to time, the solution is yellow brown. After
cooling, use hydrochloric acid solution to neutralize it, it appears a blue-purple
gelatinous precipitate.
The mass fraction w1 of the pigment blue content is calculated, according to formula
(A.1).
Where:
V - The volume of titanium trichloride standard titration solution, which is
consumed by titrating the specimen, in milliliters (mL);
1000 - The volume conversion factor;
c - The concentration of titanium trichloride standard titration solution, in mole per
liter (mol/L);
M - The molar mass of pigment blue, in grams per mole (g/mol)
[M(C16H8N2Na2O8S2) = 466.35];
2 - The mole conversion factor;
m - The mass of the specimen, in grams (g).
The test results are based on the arithmetic mean of the parallel determination results
(retaining one decimal). The absolute difference, between the results of two
independent determinations, which are obtained under the repeated conditions, shall not
be greater than 1.0% of the arithmetic mean.
A.3.2 Spectrophotometric colorimetry
A.3.2.1 Summary of method
After dissolving the specimen, measure its absorbance value, at the maximum
absorption wavelength (about 610 nm), to calculate its content.
A.3.2.2 Reagents and materials
A.3.2.2.1 Sodium hydrogen tartrate.
A.3.2.2.2 Acetic acid solution: 3.4 g/L.
A.3.2.3 Instruments and equipment
A.3.2.3.1 Magnetic stirring heater.
A.3.2.3.2 Spectrophotometer.
A.3.2.3.3 Cuvette: 1 cm.
A.3.2.4 Analytical procedures
A.3.2.4.1 Preparation of specimen solution
Weigh about 0.5 g of specimen, accurate to 0.0001 g. Add 20 mL of water and 2 g of
sodium hydrogen tartrate. Heat it, until the sample is completely dissolved. Then
transfer it to a 1000 mL volumetric flask. Use water to dilute it to the mark. Shake well.
Pipette 10 mL into a 100 mL volumetric flask. Use ammonium acetate solution, to dilute
it to the mark. Shake well.
A.3.2.4.2 Determination
Place the specimen solution in a 1 cm cuvette. Use a spectrophotometer, to measure the
absorbance value, at the maximum absorption wavelength (about 610 nm). The
absorbance value shall be controlled, within the range of 0.3 ~ 0.7. Otherwise, it shall
adjust the concentration of the specimen solution, before measuring the absorbance
again. Take the ammonium acetate solution as blank.
A.3.2.5 Result calculation
The mass fraction w2 of pigment blue content is calculated, according to formula (A.2).
Where:
A - The absorbance value of the specimen solution;
47.8 - The absorption actor of pigment blue, in liters per gram centimeter (L/g • cm);
b - The inner diameter of the cuvette, which is 1 cm;
c - The concentration of the specimen solution, in grams per liter (g/L).
The test results are based on the arithmetic mean of the parallel determination results
(retaining one decimal). The absolute difference, between the results of two
independent determinations, which are obtained under repeated conditions, shall not be
greater than 5.0% of the arithmetic mean.
A.4 Determination of hydrochloric acid insoluble
A.4.1 Reagents and materials
A.4.1.1 Hydrochloric acid.
A.4.1.2 Hydrochloric acid solution: 5 + 995.
Appendix B
Preparation method of titanium trichloride standard titration solution
B.1 Reagents and solutions
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 Potassium dichromate standard titration solution: [c(1/6 K2Cr2O7) = 0.1 mol/L].
B.2 Instruments and equipment
See Figure A.1.
B.3 Preparation of titanium trichloride standard titration solution
B.3.1 Preparation
Take 100 mL of titanium trichloride solution and 75 mL of hydrochloric acid. Put it in
a 1000 mL brown volumetric flask. Use freshly boiled water, that has been cooled to
room temperature, to dilute it to the mark. Shake well. Immediately pour it into a lower-
mouth bottle in the dark. Store it under the protection of carbon dioxide gas.
B.3.2 Calibration
Weigh about 3 g of ferrous ammonium sulfate, accurate to 0.0001 g. Put it in a 500 mL
conical flask. Under the protection of carbon dioxide gas flow, add 50 mL of water,
which was freshly boiled and cooled, to dissolve it. Then add 25 mL of sulfuric acid
solution. Continue to pass 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 to the end of the calculated volume. Immediately add 25
mL of ammonium thiocyanate solution. Use the titanium trichloride standard solution
to be calibrated, to titrate it, until the red turns to green, which is the end point. The
entire titration process shall be operated, under the protection of carbon dioxide gas
flow. Meanwhile, carry out a blank test.
B.3.3 Result calculation
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.