Some standard content:
Record number: 3717-1999
HG 2923-1999
This standard is equivalent to the United States Food Chemical Pharmacopoeia Fourth Edition (1996) [FCCV (1996) 7 "Sodium Pyrophosphate" revised chemical industry standard HG2923-1988 "Food Additive Sodium Pyrophosphate". The main technical differences between this standard and FCCIV (1996) are as follows: Based on FCC, this standard adds orthophosphate indicators according to the actual production situation of Chinese products. - The FCC standard sodium pyrophosphate content index is 95.0%~~100.5%, the standard anhydrous sodium pyrophosphate is 96.5%~100.5%, and the standard decahydrate sodium pyrophosphate is 98.0% 3 pH value index FCC standard is about 10 This standard stipulates 9.9~10.7. In terms of analytical methods, the determination of arsenic content by FCC adopts the silver diethyldithiocarbamate colorimetric method, while this standard adopts the general method for the determination of arsenic content in food additives in my country, the arsenic spot method; the determination of fluoride content by FCC adopts the fluoride ion selective electrode method, while this standard adopts the distillation method.
The main technical differences between this standard and HG2923-1988 are: - the upper limit of anhydrous sodium pyrophosphate has been increased according to the requirements of FCC. The determination of heavy metal content in the test method has been improved to make the method more scientific and reasonable. Appendix A of this standard is the appendix of the standard.
This standard replaces HG2923-1988 from the date of implementation. This standard is proposed by the Technical Supervision Department of the former Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the inorganic salt product standardization technical unit of the Ministry of Chemical Industry and the Food Hygiene Supervision and Inspection Institute of the Ministry of Health. The drafting units of this standard are: Tianjin Chemical Research Institute of the Ministry of Chemical Industry, Lianyungang Hongqi Chemical Plant, and Xuzhou Dongfang Chemical Plant of Jiangsu Northern Chlor-Alkali Group Corporation.
The main drafters of this standard are Pan Hangjun, Zhang Meirong, Liu Zhen, Chai Li and Shi Jie. This standard was first issued as a national standard in February 1988, and was adjusted to a mandatory chemical industry standard in 1997 and renumbered.
This standard is entrusted to the technical unit responsible for standardization of inorganic salt products of the Ministry of Chemical Industry for interpretation. 794
１ Scope
Chemical Industry Standard of the People's Republic of China
Food additives
Sodium pyrophosphate
Food additive-
Sodium pyrophosphate
HG 2923--1999
Replaces HG2923-1988
This standard specifies the requirements, test methods, inspection rules, marking, packaging, transportation and storage of food additive sodium pyrophosphate. This standard applies to sodium pyrophosphate, a food additive used as a quality improver in food processing. 2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB191-1990 Pictorial markings for packaging, storage and transportation
GB/T 601-19881
Preparation of standard solutions for titration analysis (volume analysis) of chemical reagentsGB/T 602--1988
GB/T 603-1988
Preparation of standard solutions for determination of impurities in chemical reagents (neqISO6353-1:1982)Preparation of preparations and products used in test methods for chemical reagents (negISO6353-1:1982)GB/T 6678-1986
GB/T 6682--1992
GB/T 8450--1987
GB/T 8451--1987
3 Classification
General rules for sampling of chemical products
Specifications and test methods for water used in analytical laboratories (eqvISO3696:1987)Determination of arsenic in food additives
Test methods for heavy metal limits in food additivesFood additives Sodium pyrophosphate is divided into two categories: anhydrous sodium pyrophosphate and sodium pyrophosphate decahydrate. 3.1 Anhydrous sodium pyrophosphate
Molecular formula: NaP, O,
Relative molecular mass: 265.90 (according to the 1995 international relative atomic mass)3.2 Sodium pyrophosphate decahydrate
Molecular formula: NaP, O·10H, 0
Relative molecular mass: 446.05 (according to the 1995 international relative atomic mass)4 Requirements
4.1 Appearance: This product is white powder or crystal. 4.2 Food additives Sodium pyrophosphate should meet the requirements of Table 1. Approved by the State Administration of Petroleum and Chemical Industry on June 16, 1999 and implemented on June 1, 2000
Sodium pyrophosphate content/%
Water-insoluble matter content/%
pH value (10g/1. solution)
Orthophosphate
Arsenic (As) content/%
Heavy metal (as Pb) content/%
Fluoride (as F) content/%
Loss on ignition/%
5 Test method
HG 2923--1999
Table 1 Requirements
Anhydrous sodium pyrophosphate (NaP,O,)
96. 5~100. 5
Sodium pyrophosphate decahydrate (NaP,O; ·10H,) ≥ 98.0
Pass the test
38.0~42.0
The reagents and water used in this standard, unless otherwise specified, refer to analytical reagents and grade 3 water specified in GB/T6682. The standard titration solutions, impurity standard solutions, preparations and products used in the test, unless otherwise specified, are prepared in accordance with the provisions of GB/T601, GB/T602 and GB/T603. 5.1 Identification test
5.1.1 Reagents and materials
5.1.1. 1 Hydrochloric acid.
5.1.1.2 Silver nitrate solution: 20g/L.
5.1.2 Identification method
5.1.2.1 Weigh 1g of sample and dissolve it in 20mL of water. Dip a platinum wire loop in hydrochloric acid and burn it on a flame until it becomes colorless. Then dip the test solution in the flame and burn it. The flame should be orange-yellow.
5.1.2.2 Weigh 0.1g of the sample, dissolve it in 10mL of water, add 1mL of silver nitrate solution, and a white precipitate will be generated. This precipitate is soluble in ammonia water and nitric acid solution, but insoluble in acetic acid solution.
5.2 Determination of sodium pyrophosphate content
5.2.1 Method summary
Sodium pyrophosphate reacts with hydrochloric acid to generate disodium dihydrogen pyrophosphate. Zinc sulfate is added to the solution to generate zinc pyrophosphate precipitate and sulfuric acid. The generated sulfuric acid is titrated with a sodium hydroxide standard titration solution. This method is only used to determine sodium pyrophosphate. When polyphosphate is present, this method is inaccurate. 5.2.2 Reagents and materials
5.2.2.1 Hydrochloric acid solution: 1+20 and 1+100. 5.2.2.2 Sulfuric acid solution: 1+500.
5.2.2.3 Zinc sulfate solution: 125g/L (adjust pH to 3.8). Preparation: Dissolve 125g zinc sulfate (ZnSO.·7H,O) in water, dilute to 1L, and adjust pH to 3.8 on a pH meter with sulfuric acid solution or sodium hydroxide solution.
5.2.2.4 Anhydrous sodium pyrophosphate.
HG 2923—1999
Recrystallize sodium pyrophosphate from water for 10 times (preparation method see Appendix A), place in platinum, and burn at 400℃ until the mass is determined.
5.2.2.5 Standard sodium hydroxide titration solution: c(NaOH) is about 0.1mol/1.1. Calibration: Weigh about 0.5g of anhydrous sodium pyrophosphate (5.2.2.4) (accurate to 0.0002g), place it in a 250mL beaker, add 90mL of water to dissolve, add hydrochloric acid solution while stirring to adjust the solution to a pH of 3.8, and then calibrate according to the steps described in 5.2.4, starting from "add 50mL of zinc sulfate solution".
The number of grams of sodium pyrophosphate equivalent to each milliliter of sodium hydroxide standard titration solution (T) is calculated according to formula (1): T=m
Where: m1—the mass of anhydrous sodium pyrophosphate weighed, g; the volume of sodium hydroxide standard titration solution consumed in the calibration, mL. V
5.2.3 Instruments and equipment
5.2.3.1 Potentiometric titrator or pH meter: the graduation value is 0.01mV or 0.1pH unit. 5.2.3.2 Magnetic stirrer.
5.2.4 Analysis steps
Weigh about 5g of sample 2 (accurate to 0.0002g), dissolve the sample in water, transfer to a 500mL volumetric flask, dilute to the mark and shake well, filter if necessary.
Pipette 50mL of the test solution into a 250mL beaker, add 40mL of water, slowly add hydrochloric acid solution while stirring to adjust the solution pH to 3.8. Add 50mL of zinc sulfate solution, stir for 5min, titrate with sodium hydroxide standard titration solution until the solution pH is close to 3.6 while stirring, stop titration, stir for 2min to allow the solution to reach equilibrium, and continue titrating until the pH is 3.8. At this time, stir for 30s3 after each drop.
5.2.5 Expression of analysis results
The content of anhydrous sodium pyrophosphate (as NaPO4) expressed as mass percentage (X,) is calculated according to formula (2): X
m×500
X 100
1000TV2
The content of sodium pyrophosphate decahydrate (as NaPO4·10H2O) expressed as mass percentage (X) is calculated according to formula (3): Xi = TVz×1. 678
m×500
X 100 —
1678TV2
Wherein: T is the number of grams of anhydrous sodium pyrophosphate equivalent to each milliliter of sodium hydroxide standard titration solution; V is the volume of sodium hydroxide standard titration solution consumed by the titration test solution, mL; - the mass of the sample, g;
is the coefficient for converting anhydrous sodium pyrophosphate into sodium pyrophosphate decahydrate. 5.2.6 Allowable difference www.bzxz.net
The arithmetic mean of the parallel determination results is taken as the determination result. The absolute difference of the parallel determination results shall not exceed 0.3%. 5.3 Determination of water-insoluble matter content
5.3.1 Summary of the method
Instructions for use:
1]FCC uses potassium hydrogen phthalate to calibrate the sodium hydroxide standard titration solution. 2]FCC directly weighs 500 mg of the sample.
·（3）
3］FCC stipulates that after each addition of sodium hydroxide standard titration solution near the end point, time should be left for any zinc hydroxide precipitate to re-dissolve. 797
HG 2923—1999
After the sample is dissolved in water, it is filtered, washed, dried and weighed. 5.3.2 Instruments and equipment
5.3.2.1 Glass sand crucible: filter plate pore size 5μm~15μm. 5.3.2.2 Electric oven: control the temperature (105±2)℃. 5.3.3 Analysis steps
Weigh 20.0gl of sample (accurate to 0.1g), place it in a 400mL beaker, add 200mL of water and heat to dissolve, filter it with a glass sand crucible that has been pre-conditioned at (105±2)℃ and wash it with hot water until the filtrate is alkaline-free. Place the glass crucible in an oven at (105 ± 2)°C and dry until the mass is constant.
5.3.4 Expression of analysis results
The water-insoluble content (X2) expressed as mass percentage is calculated according to formula (4): ml×100
Xz = m2
Wherein: ml-mass of glass crucible, g;
m2---mass of residue and glass sand, g; m-mass of sample, g.
5.3.5 Allowable difference
The arithmetic mean of the parallel determination results is taken as the determination result. The absolute difference of the parallel determination results shall not exceed 0.02%. 5.4 Determination of pH value
5.4.1 Summary of method
·(4)
Immerse the glass electrode and the reference electrode in the test solution to form a primary cell, whose potential is related to the pH value of the solution. The pH value of the solution can be obtained by measuring the potential of the primary cell. 5.4.2 Reagents and materials
Water without carbon dioxide.
5.4.3 Instruments and equipment
pH meter: the graduation value is 0.1pH unit.
5.4.4 Analysis steps
Connect the reference electrode and the measuring electrode to the acidity meter, preheat, zero and position. Weigh about 1g of the sample (accurate to 0.01g), place it in a 100mL beaker, dissolve it in water without carbon dioxide, transfer it to a 100mL volumetric flask, dilute to the scale, and shake well. Pour it into a 100mL dry beaker and use a pH meter to determine the pH value of the test solution. 5.4.5 Allowable difference
The arithmetic mean of the parallel determination results shall be taken as the determination result. The absolute difference of the parallel determination results shall not exceed 0.1 pH unit. 5.5 Test of orthophosphate
5.5.1 Reagents and materials
Silver nitrate solution: 50g/L.
5.5.2 Analysis steps
Weigh 1.0g of the sample ground into powder, add 2 to 3 drops of silver nitrate solution, and no obvious yellow color shall be produced. 5.6 Determination of arsenic content
Weigh about 1g of sample (accurate to 0.01g), place it in a wide-mouth bottle, add 6mL of hydrochloric acid to dissolve, add water to a total volume of about 40mL, and follow the instructions:
1] FCC weighs 10.0g of sample and dissolves it with 100mL of water. 2] FCC is dried for 2h.
Operate as specified in 2.4 of GB/T8450-1987. HG 2923—1999
The standard is to use a pipette to transfer 3mL of arsenic standard solution (1mL solution contains 1ugAs), and treat it in the same way as the sample. 5.7 Determination of heavy metal content
Weigh about 5g of anhydrous sodium pyrophosphate sample (accurate to 0.01g), place it in a 100mL beaker, add 80mL of water, heat to dissolve, cool and transfer to a 100mL volumetric flask, dilute to scale with water, and mix. Filter, discard the first 15mL solution, use a pipette to transfer 20mL of test solution and place it in a 50mL colorimetric tube.
Weigh about 1g of sodium pyrophosphate decahydrate sample (accurate to 0.01g), place it in a 50mL colorimetric tube, and add 20mL of water to dissolve. The standard colorimetric solution is to use a pipette to transfer 1mL of lead standard solution (1mL solution contains 10μgPb), and place it in a 50mL colorimetric tube.
The following operations are in accordance with Chapter 6 of GB/T8451-1987. 5.8 Determination of fluoride content
5.8.1 Summary of the method
In perfluoric acid medium, fluorine is separated from the sample by steam distillation. Fluorine forms a blue complex with a mixture of alizarin nitrogen carboxyl complexing agent and lanthanum nitrate. The color of the test solution is compared with that of the standard. 5.8.2 Reagents and materials
5.8.2.1 Perchloric acid.
5.8.2.2 Acetone.
5.8.2.3 Silver nitrate solution: 17g/L.
5.8.2.4 Phenolic acid indicator solution: 10g/L.
5.8.2.5 Sodium hydroxide solution: 40g/L. 5.8.2.6 Sodium hydroxide solution: 4g/L.
5.8.2.7 Hydrochloric acid solution: 1+10.
5.8.2.8 Alizarin aminocarboxylic acid complexing agent solution.
Weigh 0.193g of alizarin aminocarboxylic acid complexing agent, add a small amount of water and sodium hydroxide solution (5.8.2.5) to dissolve, add 0.13g of sodium acetate, and adjust the solution pH to 5.0 with (1+16) acetic acid solution (check with precision pH test paper, the solution is red at this time), transfer to a 500mL volumetric flask, dilute with water to the scale, shake and store in a refrigerator. When precipitation occurs, it should be prepared again. 5.8.2.9 Lanthanum nitrate solution.
Weigh 0.217g of lanthanum nitrate, dissolve it in a small amount of (1+16) acetic acid solution, add water to 450mL, adjust the pH value to 5.0 with 25g/L sodium acetate solution (check with precision pH test paper), transfer to a 500mL volumetric flask, dilute with water to the mark, store in a refrigerator, and prepare again after mold.
5.8.2.10 Buffer solution.
Weigh 44g of sodium acetate and dissolve it in 400mL of water, add 22mL of glacial acetic acid, then add glacial acetic acid dropwise to adjust the solution pH value to 4.7 (check with precision pH test paper), transfer to a 500mL volumetric flask, dilute with water to the mark, and shake well. 5.8.2.11 Fluoride standard solution: 1mL of solution contains 0.010mgF. Preparation: Use a pipette to transfer 10mL of the fluoride standard solution prepared according to GB/T602, place it in a 100mL volumetric flask, dilute with water to the mark, and shake well.
5.8.3 Instruments and equipment
Fluorine distillation device: See Figure 1.
HG 2923--1999
1-Water vapor generator (1000ml. flask); 2-Safety tube ($5mm); 3-Glass tube (5mm); 4, 13, 14-Rubber stopper; 5-Tee pipe and screw clamp; 6-Thermometer (200℃): 7-Three-necked flask (250mL); 8-Glass elbow; 9-Straight condenser (500mm); 10-Glass elbow; 11-Volume flask (250mL); 12-Heating jacket or electric furnace Figure 1 Schematic diagram of fluorine distillation device
5.8.4 Analysis steps
Weigh 2.00g of sample (accurate to 0.01g), place in a 250mL three-necked flask (see Figure 1), add a few glass beads, slowly add 10ml perchloric acid, rinse the flask wall with about 8mL of water, add 4 to 6 drops of silver nitrate solution, the thermometer on the bottle stopper should be tightly plugged, and the mercury ball of the thermometer is inserted into the test solution, connect the steam generator and the straight condenser, connect the end of the condenser to the glass elbow, and insert the elbow into a 250mL volumetric flask containing 10mL sodium hydroxide solution (5.8.2.6) and 2 drops of phenolphthalein indicator solution. Add 500mL of water to the steam generator, and add sodium hydroxide solution (5.8.2.5) to make the solution alkaline. Open the screw clamp and heat to near boiling. Close the screw clamp, pass water vapor into the three-necked flask, heat the three-necked flask at the same time, and adjust the amount of water vapor entering so that the temperature rises and remains between 135℃ and 140℃. If the solution in the volumetric flask fades, add an appropriate amount of sodium hydroxide solution (5.8.2.6) until the distillate is about 200mL, stop distillation, and shake. Use sodium hydroxide solution (5.8.2.6) or hydrochloric acid solution to adjust the pH value to 7.0 (check with precision pH test paper), add 2 drops of hydrochloric acid solution, dilute with water to the scale, and shake well. Use a pipette to transfer 25mL of the test solution, place it in a 50mL colorimetric tube, add 5mL of alizarin aminocarboxylic acid complexing agent solution and 3mL of buffer solution, and mix. Slowly add 5mL of lanthanum nitrate solution, shake, add 10mL of acetone, add water to 50mL, and leave it at room temperature for 20min. Compared with the standard colorimetric solution, its color should not be darker than the standard colorimetric solution. The standard colorimetric solution is to use a pipette to transfer 1 mL of the fluoride standard solution into a 50 mL colorimetric tube, add 25 ml of water, and start with the addition of 5 mL of "alizarin aminocarboxylic acid complexing agent" and treat it in the same way as the test solution. 5.9 Determination of loss on ignition
5.9.1 Analysis steps
Weigh 5.00 g of the sample (accurate to 0.01 g), place it in a porcelain crucible with a constant mass at 800°C, bake it at 100°C for 4 h, then transfer it to a muffle furnace at 800°C and ignite it for 30 min, cool it to room temperature in a desiccator, and weigh it. 5.9.2 Expression of analysis results
The loss on ignition (X.) expressed as mass percentage is calculated according to formula (5): m-ml×100
X3 —
-mass of the sample before ignition, g;
where.m—.
mass of the sample after ignition, g.
5.9.3 Allowable difference
·（5）
The arithmetic mean of the parallel determination results is taken as the determination result. The absolute difference of the parallel determination results shall not exceed 800
0.01% for anhydrous sodium pyrophosphate and not exceed 0.1% for monohydrated sodium pyrophosphate. 6 Inspection rules
HG 2923—1999
6.1 All eight indicators specified in this standard are type inspection items, among which main content, pH value, orthophosphate, arsenic, heavy metals, fluoride, and ignition loss are factory inspection items and should be inspected batch by batch. Under normal circumstances, type inspection shall be carried out at least once every three months. 6.2 Each batch of products shall not exceed 10t.
6.3 Determine the number of sampling units in accordance with the provisions of 6.6 in GB/T6678-1986. Each plastic woven bag is a packaging unit. When sampling, insert the sampler into 3/4 of the material layer to sample. After mixing the collected samples, reduce them to about 500g according to the quartering method, and immediately put them into two clean, dry, wide-mouth bottles with ground stoppers and seal them. Stick labels on the bottles and indicate: manufacturer name, product name, category, batch number, sampling date and name of the sampler. One bottle is used for inspection, and the other bottle is kept for three months for future reference. 6.4 The food additive sodium pyrophosphate shall be inspected by the quality supervision and inspection department of the manufacturer in accordance with the provisions of this standard, and the manufacturer shall ensure that each batch of products leaving the factory meets the requirements of this standard. If one indicator of the inspection result does not meet the requirements of this standard, re-samples should be taken from twice the amount of packaging for re-inspection. Even if only one indicator of the re-inspection result does not meet the requirements of this standard, the entire batch of products shall be unqualified. 7 Marking, packaging, transportation, purchase and storage
7.1 The packaging bag of the food additive sodium pyrophosphate should have firm and clear markings, including: manufacturer name, address, product name, trademark, the word "food additive", category, net content, batch number or production date, shelf life, production license number, this standard number, and the "Parwet" mark in GI3191.
7.2 Each batch of products leaving the factory should be accompanied by a quality certificate, which includes: the name of the manufacturer, address, product name, trademark, "food additive", batch, batch number or production date, shelf life, production license number, proof that the product quality complies with this standard and the number of this standard. 7.3 The food additive sodium pyrophosphate is packed in two layers. The inner packaging is a polyethylene film bag with a thickness of not less than 0.07mm; the outer packaging is a plastic woven bag. The net content of each bag is 25kg. When the user has special requirements for packaging, it can be negotiated by the supply and demand parties. 7.4 For the packaging of food additive sodium pyrophosphate, the film bag is tied tightly with vinyl rope or a rope of equivalent quality, or sealed with other equivalent methods; the outer bag is folded at a distance of not less than 30mm from the edge of the bag, and sewn with vinyl thread or other thread of equivalent quality at a distance of not less than 15mm from the edge of the bag. The stitches are neat and the stitch length is uniform. There is no leakage or skipping. 7.5 Food additive sodium pyrophosphate should be covered during transportation to prevent sun exposure, rain, Moisture. Do not mix with toxic and hazardous items. Prevent contamination.
7.6 Food additive sodium pyrophosphate should be stored in a cool, dry place to prevent bleaching, moisture, and sunlight. Do not mix with toxic and hazardous items. Prevent contamination.
HG2923--1999
Appendix A
(Standard Appendix)
Preparation method of three-crystallized sodium pyrophosphate
First crystallization: weigh 30g of industrial anhydrous sodium pyrophosphate and place it at 4 00mL beaker, add 100mL water, heat to dissolve, filter with medium-speed quantitative filter paper. Cool the filtrate in a cold water bath, precipitate crystals, pour out the solution, wash the crystals twice with a small amount of water. Second crystallization: Heat and dissolve the first crystals with a small amount of water, cool in a cold water bath, precipitate crystals, pour out the solution. Third crystallization: Re-crystallize the second crystals once according to the second crystallization method. If the reagent sodium pyrophosphate decahydrate is used, weigh 80g and operate according to the first and second crystallization methods. 8023 Allowable difference
·(5)
The arithmetic mean of the parallel determination results is taken as the determination result. The absolute difference of the parallel determination results is not more than 800
0.01% for anhydrous sodium pyrophosphate; not more than 0.1% for hydrated sodium pyrophosphate. 6 Inspection rules
HG 2923—1999
6.1 All eight indicators specified in this standard are type inspection items, among which the main content, pH value, orthophosphate, arsenic, heavy metals, fluoride, and ignition loss are factory inspection items and should be inspected batch by batch. Under normal circumstances, type inspection shall be carried out at least once every three months. 6.2 Each batch of products shall not exceed 10t.
6.3 Determine the number of sampling units in accordance with the provisions of 6.6 of GB/T6678-1986. Each plastic woven bag is a packaging unit. When sampling, insert the sampler into 3/4 of the material layer for sampling. After mixing the collected samples, cut them into quarters to about 500g, and immediately put them into two clean, dry wide-mouth bottles with ground stoppers and seal them. Paste labels on the bottles, indicating: manufacturer name, product name, category, batch number, sampling date and name of the sampler. One bottle is used for inspection, and the other is kept for three months for future reference. 6.4 Food additive sodium pyrophosphate shall be inspected by the quality supervision and inspection department of the manufacturer in accordance with the provisions of this standard. The manufacturer shall ensure that each batch of products shipped from the factory meets the requirements of this standard. If one of the indicators in the inspection results does not meet the requirements of this standard, re-sampling shall be carried out from twice the amount of packaging for re-inspection. If even if only one indicator in the re-inspection results does not meet the requirements of this standard, the entire batch of products shall be unqualified. 7 Marking, packaging, transportation, purchase and storage
7.1 The packaging bags of food additive sodium pyrophosphate should be firmly and clearly marked, including: manufacturer name, factory address, product name, trademark, "food additive", category, net content, batch number or production date, shelf life, production license number, this standard number, and the "Pa wet" mark in GI3191.
7.2 Each batch of products leaving the factory should be accompanied by a quality certificate, including: manufacturer name, factory address, product name, trademark, "food additive", batch number, batch number or production date, shelf life, production license number, proof that the product quality complies with this standard and this standard number. 7.3 Food additive sodium pyrophosphate is packaged in two layers. The inner packaging uses a polyethylene film bag with a thickness of not less than 0.07mm; the outer packaging uses a plastic woven bag. The net content of each bag is 25kg. If the user has special requirements for packaging, it can be resolved through negotiation between the supply and demand parties. 7.4 For the packaging of food additive sodium pyrophosphate, the film bag should be tied with vinyl rope or rope of equivalent quality, or sealed with other equivalent methods; the outer bag should be folded at a distance of not less than 30mm from the bag edge, and the opening should be sewed with vinyl thread or other thread of equivalent quality at a distance of not less than 15mm from the bag edge. The stitches should be neat and the stitch length should be uniform. There should be no leakage or skipping. 7.5 Food additive sodium pyrophosphate should be covered during transportation to prevent sun exposure, rain, and moisture. It should not be mixed with toxic and harmful substances. Prevent contamination.
7.6 Food additive sodium pyrophosphate should be stored in a cool and dry place to prevent rain, moisture, and sun exposure. It should not be mixed with toxic and harmful substances. Prevent contamination.
HG2923--1999
Appendix A
(Appendix to the standard)
Preparation method of thrice-crystallized sodium pyrophosphate
First crystallization: weigh 30g of industrial anhydrous sodium pyrophosphate, place it in a 400mL beaker, add 100mL of water, heat to dissolve, and filter with medium-speed quantitative filter paper. Cool the filtrate in a cold water bath, precipitate crystals, pour out the solution, and wash the crystals twice with a small amount of water. Second crystallization: Heat and dissolve the first crystals with a small amount of water, cool in a cold water bath, precipitate crystals, and pour out the solution. Third crystallization: Recrystallize the second crystals once according to the second crystallization method. If the reagent sodium pyrophosphate decahydrate is used, weigh 80g and operate according to the first and second crystallization methods. 8023 Allowable difference
·(5)
The arithmetic mean of the parallel determination results is taken as the determination result. The absolute difference of the parallel determination results is not more than 800
0.01% for anhydrous sodium pyrophosphate; not more than 0.1% for hydrated sodium pyrophosphate. 6 Inspection rules
HG 2923—1999
6.1 All eight indicators specified in this standard are type inspection items, among which the main content, pH value, orthophosphate, arsenic, heavy metals, fluoride, and ignition loss are factory inspection items and should be inspected batch by batch. Under normal circumstances, type inspection shall be carried out at least once every three months. 6.2 Each batch of products shall not exceed 10t.
6.3 Determine the number of sampling units in accordance with the provisions of 6.6 of GB/T6678-1986. Each plastic woven bag is a packaging unit. When sampling, insert the sampler into 3/4 of the material layer for sampling. After mixing the collected samples, cut them into quarters to about 500g, and immediately put them into two clean, dry wide-mouth bottles with ground stoppers and seal them. Paste labels on the bottles, indicating: manufacturer name, product name, category, batch number, sampling date and name of the sampler. One bottle is used for inspection, and the other is kept for three months for future reference. 6.4 Food additive sodium pyrophosphate shall be inspected by the quality supervision and inspection department of the manufacturer in accordance with the provisions of this standard. The manufacturer shall ensure that each batch of products shipped from the factory meets the requirements of this standard. If one of the indicators in the inspection results does not meet the requirements of this standard, re-sampling shall be carried out from twice the amount of packaging for re-inspection. If even if only one indicator in the re-inspection results does not meet the requirements of this standard, the entire batch of products shall be unqualified. 7 Marking, packaging, transportation, purchase and storage
7.1 The packaging bags of food additive sodium pyrophosphate should be firmly and clearly marked, including: manufacturer name, factory address, product name, trademark, "food additive", category, net content, batch number or production date, shelf life, production license number, this standard number, and the "Pa wet" mark in GI3191.
7.2 Each batch of products leaving the factory should be accompanied by a quality certificate, including: manufacturer name, factory address, product name, trademark, "food additive", batch number, batch number or production date, shelf life, production license number, proof that the product quality complies with this standard and this standard number. 7.3 Food additive sodium pyrophosphate is packaged in two layers. The inner packaging uses a polyethylene film bag with a thickness of not less than 0.07mm; the outer packaging uses a plastic woven bag. The net content of each bag is 25kg. If the user has special requirements for packaging, it can be resolved through negotiation between the supply and demand parties. 7.4 For the packaging of food additive sodium pyrophosphate, the film bag should be tied with vinyl rope or rope of equivalent quality, or sealed with other equivalent methods; the outer bag should be folded at a distance of not less than 30mm from the bag edge, and the opening should be sewed with vinyl thread or other thread of equivalent quality at a distance of not less than 15mm from the bag edge. The stitches should be neat and the stitch length should be uniform. There should be no leakage or skipping. 7.5 Food additive sodium pyrophosphate should be covered during transportation to prevent sun exposure, rain, and moisture. It should not be mixed with toxic and harmful substances. Prevent contamination.
7.6 Food additive sodium pyrophosphate should be stored in a cool and dry place to prevent rain, moisture, and sun exposure. It should not be mixed with toxic and harmful substances. Prevent contamination.
HG2923--1999
Appendix A
(Appendix to the standard)
Preparation method of thrice-crystallized sodium pyrophosphate
First crystallization: weigh 30g of industrial anhydrous sodium pyrophosphate, place it in a 400mL beaker, add 100mL of water, heat to dissolve, and filter with medium-speed quantitative filter paper. Cool the filtrate in a cold water bath, precipitate crystals, pour out the solution, and wash the crystals twice with a small amount of water. Second crystallization: Heat and dissolve the first crystals with a small amount of water, cool in a cold water bath, precipitate crystals, and pour out the solution. Third crystallization: Recrystallize the second crystals once according to the second crystallization method. If the reagent sodium pyrophosphate decahydrate is used, weigh 80g and operate according to the first and second crystallization methods. 802
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