GB 1886.3-2016 (GB 1886.3-2021 Newer Version) PDF English
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| GB 1886.3-2021 | English | 125 |
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National food safety standard - Food additives - Calcium hydrogen phosphate
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Food additive -- Calcium monohydrogen phosphate
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GB 1886.3-2016: PDF in English GB 1886.3-2016
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
National food safety standard -
Food additive - Calcium monohydrogen phosphate
食品添加剂 磷酸氢钙
ISSUED ON: AUGUST 31, 2016
IMPLEMENTED ON: FEBRUARY 01, 2017
Issued by: National Health and Family Planning Commission of the
People's Republic of China
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Chemical name, molecular formula and relative molecular mass ... 4
3 Technical requirements ... 4
Annex A Test methods ... 6
National food safety standard -
Food additive - Calcium monohydrogen phosphate
1 Scope
This Standard applies to the food additive: calcium monohydrogen phosphate,
which is produced by the reaction of food phosphoric acid and calcium
compounds.
2 Chemical name, molecular formula and relative
molecular mass
2.1 Chemical name
Calcium monohydrogen phosphate
2.2 Molecular formula
CaHPO4 · 2H2O
2.3 Relative molecular mass
172.09 (according to 2007 international relative atomic mass)
3 Technical requirements
3.1 Sensory requirements
Sensory requirements shall comply with the provisions of Table 1.
Table 1 -- Sensory requirements
Item Requirement Test method
Color White Take an appropriate amount of
sample and place it in a clean, dry
white porcelain dish, observe its color
and state under natural light.
State Powder
3.2 Physical and chemical indicators
Physical and chemical indicators shall comply with the provisions of Table 2.
Annex A
Test methods
A.1 Safety tips
The reagents used in this test method are toxic or corrosive and shall be
handled with care. If they are splashed on the skin, rinse immediately with water,
or treat immediately in severe cases.
A.2 General requirements
If no other requirements are indicated, the reagents and water used in this
Standard refer to analytical reagents and the tertiary water specified in GB/T
6682. If no other requirements are indicated, the standard solutions, impurity
standard solutions, preparations required in the test are prepared in
accordance with GB/T 601, GB/T 602 and GB/T 603. For the solutions used in
the test, if it is not indicated which solvent is used to prepare, the solvent refers
to aqueous solution.
A.3 Identification test
A.3.1 Reagents and materials
A.3.1.1 Hydrochloric acid solution: 1+3.
A.3.1.2 Ammonia solution: 1+1.
A.3.1.3 Ammonium oxalate solution: 35 g/L.
A.3.2 Identification method
WEIGH approximately 0.1 g of sample, ADD 5 mL of water and 5 mL of
hydrochloric acid solution to dissolve the sample. ADD 2.5 mL aqueous
ammonia solution dropwise while shaking, and then ADD 5 mL of ammonium
oxalate solution to produce white precipitate.
A.4 Determination of calcium monohydrogen phosphate (CaHPO4 · 2H2O)
A.4.1 Method summary
In the test solution, ADD sucrose solution as dispersant and triethanolamine
solution as masking agent; ADD EDTA standard titration solution dropwise to
the near end point under acidic conditions; USE sodium hydroxide solution to
adjust the pH of the test solution to be within the color development pH range
of calcium carboxylic acid indicator; continue to TITRATE the remaining calcium.
where
c - the concentration of EDTA standard titration solution, in moles per liter
(mol/L);
V - the volume of the EDTA standard titration solution spent by the test
solution, in milliliters (mL);
V0 - the volume of the EDTA standard titration solution spent in the blank test,
in milliliters (mL);
M - the molar mass of calcium monohydrogen phosphate, in grams per mole
(g/mol), (M = 172.1);
m - the mass of the sample, in grams (g);
25 - the volume of the pipetted test solution, in milliliters (mL);
250 - the total volume of the test solution, in milliliters (mL);
1000 - the conversion factor.
The test result is based on the arithmetic mean of the parallel determination
results. The absolute difference between the two independent determination
results obtained under repeatability conditions is not more than 0.5 %.
A.5 Determination of ignition loss
A.5.1 Instruments and equipment
A.5.1.1 High temperature furnace: The temperature can be controlled between
800 °C and 825 °C.
A.5.1.2 Porcelain crucible: 30 mL.
A.5.2 Analysis steps
WEIGH 3 g of sample to the nearest 0.0002 g, PLACE on a porcelain crucible
that has been burned to constant weight at 800 °C ~ 825 °C, BURN to constant
weight at 800 °C ~ 825 °C.
A.5.3 Calculation of results
The mass fraction of ignition loss, w2, is calculated according to formula (A.2):
Accurately PIPETTE 2.00 mL of lead standard solution into a 50 mL colorimetric
tube, ADD 25 mL of water, ADD 5 mL of acetate buffer solution, MIX well, ADD
5 drops of sodium sulfide glycerin solution, DILUTE to the mark with water, MIX
well, PLACE in the dark for 5 min.
A.6.4.2 Preparation of sample colorimetric solution
WEIGH 2 g ± 0.01 g of sample, ADD 5 mL hydrochloric acid solution and 20 mL
water, HEAT to dissolve. After cooling, ADD ammonia water until the white
precipitate appears, then ADD a small amount of hydrochloric acid until the
precipitate disappears. TRANSFER all into a 50 mL colorimetric tube, ADD 5
mL of acetate buffer solution, MIX well, ADD 5 drops of sodium sulfide glycerin
solution, DILUTE to the mark with water, MIX well, PLACE in the dark for 5 min.
The color shall not be deeper than that of the standard colorimetric solution.
A.7 Determination of lead (Pb)
Warning: The reagents used in this clause are volatile and toxic, so the
operation shall be carried out in a fume hood.
A.7.1 Method summary
The sample is dissolved, and the lead in the sample is subjected to treatments
such as complexation with ammonium pyrrolidine dithiocarbamate (APDC) and
extraction, and then introduced into an atomic absorption spectrophotometer.
After atomization, the absorbance at 283.3 nm is measured, and compared with
the lead standard limit.
A.7.2 Reagents and materials
A.7.2.1 Hydrochloric acid.
A.7.2.2 Chloroform.
A.7.2.3 Nitric acid.
A.7.2.4 Sodium hydroxide solution: 250 g/L.
A.7.2.5 Pyrrolidine dithiocarbamate (APDC) solution: 2 %. WEIGH 2.0 g ± 0.01
g of pyrrolidine dithiocarbamate (APDC) and DISSOLVE in 100 mL of water. If
there is insoluble matter, filter before use.
A.7.2.6 Lead standard solution: with lead (Pb) 10 μg/mL. Accurately PIPETTE
10 mL of the lead standard solution [1 mL of solution contains 1 mg of lead (Pb)]
prepared in HG/T 3696.2, TRANSFER to a 1000 mL volumetric flask, ADD
water to the mark. Prepare before use.
The absorbance of the sample determination solution shall not be greater than
the absorbance of the lead standard determination solution.
A.8 Determination of fluoride (in F)
A.8.1 Method summary
After the sample is dissolved, in the acidic medium of pH 5.5 ~ 6.0, using the
saturated calomel electrode as the reference electrode and the fluoride ion
selective electrode as the measuring electrode, the fluorine content is
determined by the working curve method.
A.8.2 Reagents and materials
A.8.2.1 Hydrochloric acid solution: 1+4.
A.8.2.2 Total ionic strength buffer: formulated at the time of use.
A.8.2.2.1 Sodium acetate solution: c(CH3COONa · 3H2O) = 3 mol/L. WEIGH
204 g of sodium acetate, DISSOLVE in about 300 mL of water, COOL, ADJUST
pH ≈ 7.0 with 1 mol/L acetic acid, TRANSFER to a 500 mL volumetric flask,
ADD water to dilute to the mark.
A.8.2.2.2 Sodium citrate solution: c(Na3C6H5O7 · 2H2O) = 0.75 mol/L. WEIGH
110 g of sodium citrate, DISSOLVE in about 300 mL of water, ADD 14 mL of
perchloric acid, TRANSFER to a 500 mL volumetric flask, ADD water to dilute
to the mark.
A.8.2.2.3 MIX the sodium acetate solution (A.8.2.2.1) with the sodium citrate
solution (A.8.2.2.2) in equal amounts.
A.8.2.2.4 Fluorine standard solution: containing 10 μg of fluorine (F). Accurately
PIPETTE 10 mL of the fluorine standard solution prepared in HG/T 3696.2 [1
mL of solution contains 1 mg of fluorine (F)], TRANSFER to a 1000 mL
volumetric flask, ADD water to the mark. This solution shall be stored in a
polyethylene plastic bottle.
A.8.3 Instruments and equipment
A.8.3.1 Fluoride electrode.
A.8.3.2 Calomel electrode.
A.8.3.3 Potentiometer.
A.8.3.4 Magnetic stirrer.
A.8.4 Analysis steps
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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