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GB 1886.74-2015 PDF in English


GB 1886.74-2015 (GB1886.74-2015) PDF English
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GB 1886.74-2015: PDF in English

GB 1886.74-2015
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
National food safety standard - Food additives - Potassium
citrate
ISSUED ON: NOVEMBER 13, 2015
IMPLEMENTED ON: MAY 13, 2016
Issued by: National Health and Family Planning Commission of PRC
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Chemical name, molecular formula, structural formula, relative molecular mass ... 4
3 Technical requirements ... 4
Appendix A Inspection method ... 6
National food safety standard - Food additives - Potassium
citrate
1 Scope
This standard applies to the food additive potassium citrate, which is prepared from
citric acid and potassium hydroxide or potassium carbonate.
2 Chemical name, molecular formula, structural formula,
relative molecular mass
2.1 Chemical name
Potassium 2-hydroxypropane-1,2,3 tricarboxylate
2.2 Molecular formula
C6H5K3O7·H2O
2.3 Structural formula
2.4 Relative molecular mass
324.41 (according to 2011 international relative atomic mass)
3 Technical requirements
3.1 Sensory requirements
Sensory requirements shall comply with the provisions of Table 1.
Appendix A
Inspection method
A.1 Warning
Some test procedures specified in the test methods may lead to hazardous situations.
Operators shall take appropriate safety and protective measures.
A.2 General provisions
The reagents and water used in this standard, unless otherwise required, refer to
analytically pure reagents and grade three water specified in GB/T 6682. Unless
otherwise specified, the standard titration solutions, standard solutions for impurity
determination, preparations and products used in the test methods shall be prepared, in
accordance with the provisions of GB/T 601, GB/T 602, GB/T 603. Unless otherwise
stated, the solutions used are all aqueous solutions.
A.3 Identification test
A.3.1 Reagents and materials
A.3.1.1 5% hydrochloric acid solution: Measure 117 mL of hydrochloric acid. Dilute it
to 1000 mL.
A.3.1.2 5% sulfuric acid solution: Measure 29 mL of sulfuric acid. Slowly inject it into
about 700 mL of water. Cool it. Dilute it to 1000 mL.
A.3.1.3 Mercury sulfate solution: Weigh 5 g of mercury oxide. Add 40 mL of water.
Slowly add 20 mL of concentrated sulfuric acid. Stir while adding. Add 40 mL of water
and stir to dissolve.
A.3.1.4 Potassium permanganate solution: .
A.3.1.5 Pyridine-acetic anhydride solution (3 + 1): Mix pyridine and acetic anhydride,
at a ratio of 3:1.
A.3.2 Analytical procedures
A.3.2.1 Put a small amount of specimen into a 25 mL crucible. Ignite it with direct fire,
which will slowly decompose; however, no caramel smell shall occur.
A.3.2.2 Take 2 mL of specimen solution. Add a few drops of sulfuric acid solution. Heat
to boiling. Add a few drops of potassium permanganate solution. Shake it; the purple
color disappears. Then add 1 drop of mercury sulfate solution, to form a white
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.