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This standard supersedes GB 1889-2004 Food Additive - Calcium Monohydrogen Phosphate.
The following main change has been made with respect to GB 1889-2004:
——The standard name is revised as National Food Safety Standard - Food Additive - Calcium Monohydrogen Phosphate.
National Food Safety Standard
Food Additive - Calcium Monohydrogen Phosphate
1 Scope
This standard is applicable to the food additive - calcium monohydrogen phosphate that is generated from the reaction of phosphoric acid and calcium compounds in foods.
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 (as per 2007 international relative atomic mass)
3 Technical Requirements
3.1 Sensory requirements
Sensory requirements shall be in accordance with those specified in Table 1.
Table 1 Sensory Requirements
Item Requirement Inspection method
Color and lustre White Put a proper amount of specimen into a clean and dry white porcelain dish, and observe its color and lustre as well as state under natural light.
State Powder
3.2 Physical and chemical indexes
Physical and chemical indexes shall be in accordance with those specified in Table 2.
Table 2 Physical and Chemical Indexes
Item Index Inspection method
Calcium monohydrogen phosphate (CaHPO4·2H2O), ω/% 98.0~103.0 A.4 of Annex A
Loss on ignition, ω/% 24.5~26.5 A.5 of Annex A
Heavy metal (calculated by Pb)/(mg/kg) ≤ 10 A.6 of Annex A
Lead (Pb)/(mg/kg) ≤ 5.0 A.7 of Annex A
Arsenic (As)/(mg/kg) ≤ 2.0 GB 5009.76
Fluoride (calculated by F), ω/% ≤ 0.005 A.8 of Annex A
Insoluble matter in hydrochloric acid, ω/% ≤ 0.05 A.9 of Annex A
Annex A
Inspection Methods
A.1 Safety warning
The reagents used in the inspection methods are toxic or corrosive, therefore the operator shall operate carefully. In case of splashing to skin, flush with water immediately, where the situation is serious, seek treatment immediately.
A.2 General requirements
Unless otherwise specified, analytically pure reagents and Grade 3 water (specified in GB/T 6682) shall be used in this standard; if there is no requirement, standard solution, impurity standard solution, preparations and products used in test shall be prepared according to those specified in GB/T 601, GB/T 602 and GB/T 603. Solutions used in the test are all aqueous solution, unless other solvents are indicated to be used for preparation.
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: 35g/L.
A.3.2 Identification method
Weigh about 0.1g of specimen, add 5mL of water and 5mL of hydrochloric acid solution to dissolve the specimen. Dropwise add 2.5mL of ammonia solution while shaking, and add 5mL of ammonium oxalate solution, after that, white precipitate is generated.
A.4 Determination of calcium monohydrogen phosphate (CaHPO4·2H2O)
A.4.1 Method summary
Add sucrose solution into test solution to serve as dispersing agent, and add triethanolamine solution to serve as masking agent, then dropwise add ethylene diamine tetraacetic acid disodium (EDTA) standard titration solution in acidic condition to be close to the end point, adjust the pH of test solution with sodium hydroxide solution to make it within the color development pH range of calcium carboxylic acid indicator, then continue titrating the residual calcium.
A.4.2 Reagents and materials
A.4.2.1 Hydrochloric acid solution: 1+1.
A.4.2.2 Sucrose solution: 25g/L.
A.4.2.3 Triethanolamine solution: 1+1.
A.4.2.4 Sodium hydroxide solution: 450g/L.
A.4.2.5 Ethylene diamine tetraacetic acid disodium standard titration solution: c(EDTA)=0.05mol/L.
A.4.2.6 Malachite green indicator solution: 1g/L.
A.4.2.7 Cal-red indicator.
A.4.3 Apparatus
Magnetic stirrer.
A.4.4 Analytical procedures
A.4.4.1 Preparation of test solution A
Put 2.5g (to the nearest 0.000 2g) of specimen into a 100mL beaker, add 20mL of hydrochloric acid solution to dissolve it, then completely transfer the solution into a 250mL volumetric flask, add water to the scale, and shake well. This solution is test solution A.
A.4.4.2 Determination
Accurately transfer 25mL of test solution A into a 250mL conical flask, add 50mL of water, 5mL of sucrose solution and 2mL of triethanolamine solution, put the flask on magnetic stirrer and stir the solution therein uniformly, dropwise add about 25mL of ethylene diamine tetraacetic acid disodium standard titration solution with burette at normal speed, add 1 drop of malachite green indicator solution and dropwise add sodium hydroxide solution until the solution becomes colorless, then add another 1~2 drop(s). Add a small amount of cal-red indicator, and continue titrating with ethylene diamine tetraacetic acid disodium standard titration solution until the solution turns from purple into blue, maintain 30s unchanged. Conduct blank test at the same time.
Foreword i
1 Scope
2 Chemical Name, Molecular Formula and Relative Molecular Mass
3 Technical Requirements
Annex A Inspection Methods
