GB 29207-2012 PDF English
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Overview:-- Overview:
GB 29207-2012 "National Food Safety Standard - Food Additive - Magnesium Sulfate" is a Chinese national standard issued in December 2012. This standard will be mandatorily enforced for new products, from January 2013, for the Food Additive Magnesium Sulfate.
-- Standard and product transition:
This is the 1st standard in the evolution. There is no previous version.
-- Scope:
This Standard applies to magnesium sulfate, a food additive produced from natural magnesium carbonate (magnesite), sulfuric acid, magnesium vanadium sulfide and seawater.
-- Sensory requirements and inspection method:
For color and state requirements, Take appropriate quantity of specimen into 50mL beaker; and observe the color and state under natural light.
-- Physical and chemical indicators:
Inspection methods refer to GB/T 5009.74, GB/T 5009.74 and GB/T 23769 etc.
-- Inspection methods:
The reagents and water used in this Standard, unless otherwise specified, refer to analytically pure reagents and Grade-3 water specified in GB/T 6682-2008. The standard titration solutions, standard solutions for impurity determination, preparations and products required in the test, unless otherwise specified, are prepared in accordance with the provisions of GB/T 601, GB/T 602 and GB/T 603. The used solutions refer to aqueous solutions unless otherwise specified.GB 29207-2012: Food additive magnesium---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/GB29207-2012
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
National Food Safety Standard - Food Additive - Magnesium
Sulfate
ISSUED ON: DECEMBER 25, 2012
IMPLEMENTED ON: JANUARY 25, 2013
Issued by. Ministry of Health of the People’s Republic of China
Table of Contents
1 Scope... 3
2 Chemical Name, Molecular Formula and Relative Molecular Mass... 3
3 Technical Requirements... 4
Appendix A Inspection Methods... 5
1 Scope
This Standard applies to magnesium sulfate, a food additive produced from natural magnesium
carbonate (magnesite), sulfuric acid, magnesium vanadium sulfide and seawater.
2 Chemical Name, Molecular Formula and Relative Molecular Mass
2.1 Chemical name
Anhydrous magnesium sulfate
Magnesium sulfate monohydrate
Magnesium sulfate trihydrate
Magnesium sulfate heptahydrate
Dried magnesium sulfate
2.2 Molecular formula
Anhydrous magnesium sulfate. MgSO4
Magnesium sulfate monohydrate. MgSO4 · H2O
Magnesium sulfate trihydrate. MgSO4 · 3H2O
Magnesium sulfate heptahydrate. MgSO4 · 7H2O
Dried magnesium sulfate. MgSO4 ·nH2O (n is the average value of hydration, between 2 and 3)
2.3 Relative molecular mass
Anhydrous magnesium sulfate. 120.37 (according to the 2007 international relative atomic
mass)
Magnesium sulfate monohydrate. 138.38 (according to the 2007 international relative atomic
mass)
Magnesium sulfate trihydrate. 174.41 (according to the 2007 international relative atomic mass)
Magnesium sulfate heptahydrate. 246.47 (according to the 2007 international relative atomic
mass)
3 Technical Requirements
3.1 Sensory requirements
It shall comply with the provisions of Table 1.
Table 1 – Sensory Requirements
Color Colorless or white Take appropriate quantity of specimen into 50mL beaker; and
observe the color and state under natural light State Crystal or powder
3.2 Physical and chemical indicators
It shall comply with the provisions of Table 2.
Table 2 -- Physical and chemical indicators
Items
Anhydrous magnesium sulfate
Magnesium sulfate monohydrate
Magnesium sulfate trihydrate
Magnesium sulfate heptahydrate
Dried magnesium sulfate
Indicators Inspection methods
Appendix A
Inspection Methods
A.1 Warning
Some of the reagents used in the test methods of this Standard are toxic or corrosive, and
appropriate safety and protective measures shall be taken during operation.
A.2 General
The reagents and water used in this Standard, unless otherwise specified, refer to analytically
pure reagents and Grade-3 water specified in GB/T 6682-2008.The standard titration solutions,
standard solutions for impurity determination, preparations and products required in the test,
unless otherwise specified, are prepared in accordance with the provisions of GB/T 601, GB/T
602 and GB/T 603.The used solutions refer to aqueous solutions unless otherwise specified.
A.3 Identification test
A.3.1 Reagents and materials
A.3.1.1 Ammonium chloride solution. 200 g/L.
A.3.1.2 Ammonium carbonate solution. 200 g/L.
A.3.1.3 Sodium phosphate solution. 60 g/L.
A.3.1.4 Ammonia solution. 2+3.
A.3.1.5 Barium chloride solution. 100 g/L.
A.3.1.6 Hydrochloric acid solution. 1+1.
A.3.1.7 Lead acetate solution. 80 g/L.
A.3.1.8 Ammonium acetate solution. 100 g/L.
A.3.2 Identification method
A.3.2.1 Magnesium ion identification
Take about 0.5 g of specimen, dissolve in 10 mL of water; add 5 mL of ammonium chloride
solution and 5 mL of ammonium carbonate solution; stir; no precipitation is produced. Then
add 5 mL of sodium phosphate solution; produce white crystalline precipitation; add 10 mL of
ammonia solution, the white crystalline precipitation does not dissolve.
A.3.2.2 Sulfate ion identification
A.3.2.2.1 Take about 0.5 g of specimen, dissolve in 10 mL of water; add barium chloride
solution; produce white precipitation; this white precipitation is insoluble in hydrochloric acid
solution.
A.4 Determination of magnesium sulfate (MgSO4) content
A.4.1 Method summary
Add ammonia-ammonium chloride buffer solution A with a pH of ≈ 10 to the specimen solution;
use chrome black T as an indicator; and titrate the magnesium content with disodium
ethylenediaminetetraacetic acid (EDTA) standard titration solution.
A.4.2.3 Chrome black T indicator.
A.4.3 Analysis procedures
Weigh about 1.5 g of the specimen burned according to A.9, accurate to 0.0002 g; place it in a
200 mL beaker; add 25 mL of water to dissolve. Then transfer to a 250 mL volumetric flask;
dilute to the mark with water; and shake well. Use a pipette to transfer 25 mL of the specimen
solution; place it in a 250 mL conical flask; add 25 mL of water; add 10 mL of ammonia-
ammonium chloride buffer solution A, a small amount of chrome black T indicator; and titrate
with disodium ethylenediaminetetraacetic acid standard titration solution until the solution
changes from purple-red to pure blue as the end point.
At the same time, perform the same blank test. Except for not adding the specimen to the blank
sample solution, the types and amounts of other added reagents (except the standard titration
solution) are the same as those of the specimen solution.
A.5 Determination of lead (Pb)
A.5.1 Reagents and materials
A.5.1.1 Chloroform.
A.5.1.2 Hydrochloric acid.
A.5.1.3 Nitric acid.
A.5.1.4 Sodium hydroxide solution. 250 g/L.
A.5.1.5 Ammonium pyrrolidine dithiocarboxylate (APDC) solution. 20 g/L. Filter before use.
A.5.1.6 Standard lead (Pb) solution. 0.005 mg/mL.
A.5.1.7 Water. Meet the requirements of Grade-2 water in GB 6682-2008.
A.5.2 Apparatuses
Atomic absorption spectrophotometer. Equipped with a lead hollow cathode lamp.
A.5.3 Analysis procedures
A.5.3.1 Cleaning of glassware
Soak in nitric acid solution (1+5) overnight; rinse repeatedly with tap water; and finally rinse
with water.
A.5.3.2 Preparation of specimen solution
Weigh about 5 g of specimen, accurate to 0.01 g; place in a 150 mL beaker; add 30 mL of water;
and add 1 mL of hydrochloric acid. Heat and boil for a few minutes; cool; and dilute with water
to 100 mL. Adjust the solution pH to 1.0~1.5 with sodium hydroxide solution. Transfer this
solution to a 250 mL separating funnel and dilute with water to about 200 mL. Add 2 mL of
ammonium pyrrolidine dithiocarbamate (APDC) solution and mix. Extract twice with 20 mL
of chloroform; collect the extract in a 50 mL beaker; evaporate to dryness in a steam bath (this
operation must be performed in a fume hood); add 3 mL of nitric acid to the residue; and
continue evaporating until nearly dry. Add 0.5 mL of nitric acid and 10 mL of water; and heat
until the solution volume is about 3 mL~5 mL. Transfer to a 10 mL volumetric flask; dilute to
scale with water; and shake well.
A.6 Determination of selenium (Se)
A.6.1 Reagents and materials
A.6.1.1 Hydroxylamine hydrochloride.
A.6.1.2 Cyclohexane.
A.6.1.3 Hydrochloric acid solution. 1+1.
A.6.1.4 Ammonia solution. 1+1.
A.6.1.5 2,3-Diaminonaphthalene solution. Weigh 0.1 g of 2,3-diaminonaphthalene and 0.5 g of
hydroxylamine hydrochloride; dissolve in 0.1 mol/L hydrochloric acid solution to make 100
mL of solution.
A.6.1.6 Selenium (Se) standard solution. 0.01 mg/mL.
A.6.2 Apparatuses
Spectrophotometer, equipped with a cuvette with an optical length of 1 cm.
A.6.3 Analysis procedures
Weigh about 1 g of the specimen, accurate to 0.000 2 g; place in a 150 mL beaker; add 25 mL
of water; 5 mL of hydrochloric acid solution; stir; heat and boil for 15 min; and cool. Adjust the
pH to 2±0.2 (check with precision pH test paper) with ammonia solution; add 0.2 g of
hydroxylamine hydrochloride; stir until dissolved. Immediately add 5 mL of 2,3-
diaminonaphthalene solution; and mix well. Cover with a watch glass and stand at room
temperature for 100 min. Then transfer all to a 125 mL separating funnel and add water to about
60 mL. Add 10 mL of cyclohexane with a pipette; shake vigorously for 2 min; stand and
separate; and discard the water layer. Use a 1 cm colorimetric tube to measure the absorbance
at a wavelength of about 380 nm with water as a reference. The absorbance shall be no greater
than the standard.
The standard is to pipette 3 mL of selenium standard solution and treat it in the same way as
the specimen at the same time.
A.7 Determination of chloride (as Cl)
Weigh 1.00 g ± 0.01 g of the specimen; place it in a 50 mL beaker; and add 10 mL of water to
dissolve the specimen. Then transfer all of it to a 50 mL colorimetric tube; add 2 mL of silver
nitrate solution (17 g/L) and 1 mL of nitric acid solution (1+2); then add water to the scale and
shake well. Place it in a dark place for 10 min. Compared with the standard turbidity solution,
its turbidity shall be no darker than the standard.
The standard turbidity solution is to pipette 3.00 mL of chlorine (Cl) standard solution (0.1
mg/mL) and place it in a 50 mL colorimetric tube. Treat it in the same way as the specimen
solution at the same time.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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