GB 1886.15-2015 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB 1886.15-2015 | English | 140 |
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National food safety standard - Food additives - Phosphoric Acid
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GB 1886.15-2015: National food safety standard - Food additives - Phosphoric Acid---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GB1886.15-2015
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
National Food Safety Standard
- Food Additives - Phosphoric Acid
Issued on. SEPTEMBER 22, 2015
Implemented on. MARCH 22, 2016
Issued by. National Health and Family Planning Commission of PRC
Table of Contents
Foreword... 3
1 Scope... 4
2 Molecular Formula and Relative Molecular Mass... 4
3 Technical Requirements... 4
Appendix A Test Methods... 6
Foreword
This Standard replaced GB 3149-2004 Food Additives – Phosphoric Acid.
Compared with GB 3149-2004, this Standard made the major changes as follows.
--- Modify the standard name into “National Food Safety Standard – Food Additives
– Phosphoric Acid”.
National Food Safety Standard
– Food Additives – Phosphoric Acid
1 Scope
This Standard is applicable to food additive of phosphoric acid produced by thermal
method.
2 Molecular Formula and Relative Molecular Mass
2.1 Molecular formula
H3PO4
2.2 Relative molecular mass
97.99 (according to international relative atomic mass in 2007)
3 Technical Requirements
3.1 Sensory requirements
The sensory requirements shall meet the requirements of Table 1.
Table 1 -- Sensory Requirements
Item Requirements Test Methods
Color Colorless, transparent, or with slight light color
Take an appropriate amount of sample and
place it in a clean, dry colorimetric tube, and
visually observe its color and state under
natural light State Viscous liquid
Appendix A
Test Methods
A.1 Safety tips
Some reagents used in this test method are toxic, corrosive and flammable. Operators
should be careful. Rinse immediately with water if splashed on the skin, and treat
immediately, if injured severely. When using flammable materials, it is strictly prohibited
to use open flames for heating.
A.2 General provisions
The reagents and water used in this Standard refer to analytical reagents and Grade-
III water specified in GB/T 6682 when no other requirements are specified. The
standard solutions used in the test, the standard solutions for the determination of
impurities, preparations and products shall be prepared in accordance with GB/T 601
and GB/T 602, and GB/T 603 when no other requirements are specified. When the
solution used in the test is not specified with which solvent, it refers to an aqueous
solution.
A.3 Identification test
A.3.1 Reagents and materials
A.3.2 Identification method
Take about 1g of the sample; put it in a 100mL beaker; add 10mL of water, a drop of
phenolphthalein indicator solution; adjust to neutral by sodium hydroxide solution; add
silver nitrate solution drop-by-drop; form the yellow precipitate; and the precipitate can
be dissolved in diluted nitric acid (5%) or ammonia.
A.4 Determination of phosphoric acid (H3PO4) content
A.4.1 Weight method (Arbitration method)
A.4.1.1 Method summary
In the hydrochloric acid medium, the specimen and the added quimociac precipitant
produce quinoline phosphomolybdate to precipitate. After filtering, washing, drying and
weighing, the phosphoric acid content was determined.
A.4.1.2 Reagents and materials
A.4.1.2.1 Hydrochloric acid.
A.4.1.2.2 Preparation of quimociac solution
A.4.1.3 instruments and equipment
A.4.1.3.1 Glass sand crucible. filter plate pore size 5μm~15μm.
A.4.1.3.2 Electric oven. the temperature can be controlled at 180°C±5°C or
250°C±10°C.
A.4.1.4 Analysis procedures
A.4.1.4.3 Determination
Pipette 10mL of test solution and blank test solution into 250mL beakers respectively;
add water to a total volume of about 100mL; add 50mL of quimociac solution; cover
the watch glass; and heat in the water bath until the contents of the beaker reach
75°C±5°C, keep it for 30s (in the process of adding reagents and heating, open flames
shall not be used, and stirring shall not be performed to avoid condensation and
agglomeration). Take it out and cool to room temperature. Stir for 3~4 times during
cooling. Filter in a glass sand crucible with a constant weight made at 180°C±5°C or
250°C±10°C.
A.4.1.5 Calculation of results
The mass fraction, w1, of phosphoric acid (H3PO4) content is calculated according to
Formula (A.1).
A.4.2 Capacity method
A.4.2.1 Method summary
According to the nature of phosphoric acid, take the thymol phthalein as the indicator
liquid; directly titrate by and the sodium hydroxide standard titration solution to
determine the phosphoric acid content.
A.4.2.2 Reagents and materials
A.4.2.2.1 Sodium hydroxide standard titration solution. c(NaOH) = 1 mol/L.
A.4.2.2.2 Thymol phthalein indicator liquid. 1 g/L.
A.4.2.3 Analysis procedures
A.5 Determination of fluoride (by F)
A.5.1 Method summary
Under neutral conditions, take a saturated calomel electrode as a reference electrode;
and use a fluoride ion selective electrode to directly measure the electrode potential of
the solution. The standard curve method was used to determine the fluorine content.
A.5.2 Reagents and materials
A.5.2.1 Hydrochloric acid solution. 1+1.
A.5.2.5 Bromocresol green indicator liquid. 1 g/L.
A.5.2.6 Fluoride standard solution. 1mL of such solution contains 2μg of fluorine (F).
Prepare just before use. Pipette 2mL of the fluoride standard solution prepared
according to GB/T 602; place it in a 100mL volumetric flask; dilute with water to the
mark; and shake well.
A.5.3 Instruments and equipment
A.5.3.1 Fluoride ion selective electrode.
A.5.4 Analysis procedures
A.5.4.1 Drawing of working curve
Pipette 0.00mL, 1.00mL, 3.00mL, 5.00mL, 7.00mL, 10.00mL of fluoride standard
solutions into the 50mL volumetric flasks, respectively; add 1mL hydrochloric acid
solution, 5 drops of citric acid - trisodium citrate buffer solution and 2 drops of
bromocresol green indicator liquid; adjust the solution to blue by sodium hydroxide
solution;
A.5.4.2 Preparation of test solution
Take about 10g of specimen, accurate to 0.01g; put in a 100mL beaker; dilute with a
small amount of water; adjust to neutral by sodium hydroxide solution; transfer to a
100mL volumetric flask, dilute to the mark by water; and shake well.
A.5.4.3 Determination
Pipette 10 mL of the test solution into a 50 mL volumetric flask; add 1 mL of hydrochloric
acid solution, 5 drops of citric acid - trisodium citrate buffer solution, and 2 drops of
bromocresol green indicator solution; use sodium hydroxide solution to make the
solution blue, and then use nitric acid solution to make the solution just yellow. Add
20mL of citric acid - trisodium citrate buffer solution; dilute with water to the mark; and
mix well. Pour the solution into a 50mL dry beaker; place it on an electromagnetic
stirrer; insert a fluoride ion selective electrode and a saturated calomel electrode;
connect the potentiometer; stir for a while; adjust the potentiometer to zero point; then
measure, and record the potential at equilibrium value. Find the logarithm of the value
of the corresponding fluoride (by F) mass from the standard curve; and check the
inverse logarithm to get the value of the fluoride (by F) mass.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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