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GB 25567-2010 English PDF

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GB 25567-2010: National food safety standards of food additives disodium dihydrogen pyrophosphate
Status: Obsolete

Standard ID	Contents [version]	USD	STEP2	[PDF] delivered in	Standard Title (Description)	Status	PDF
GB 25567-2010	English	399	Add to Cart	3 days [Need to translate]	National food safety standards of food additives disodium dihydrogen pyrophosphate	Obsolete	GB 25567-2010

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Basic data

Standard ID	GB 25567-2010 (GB25567-2010)
Description (Translated English)	National food safety standards of food additives disodium dihydrogen pyrophosphate
Sector / Industry	National Standard
Classification of Chinese Standard	X42
Classification of International Standard	67.220.20
Word Count Estimation	10,116
Date of Issue	2010-12-21
Date of Implementation	2011-02-21
Regulation (derived from)	Ministry of Health Bulletin No. 19 of 2010
Issuing agency(ies)	Ministry of Health of the People's Republic of China
Summary	This Chinese standard applies to soda ash, caustic sodium hydroxide or sodium dihydrogen phosphate and one thermal phosphoric acid reaction of the food additive disodium dihydrogen pyrophosphate.

GB 25567-2010: National food safety standards of food additives disodium dihydrogen pyrophosphate

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National food safety standards of food additives disodium dihydrogen pyrophosphate National Food Safety Standard Food additives disodium dihydrogen pyrophosphate Issued on. 2010-12-21 2011-02-21 implementation National Standards of People's Republic of China People's Republic of China Ministry of Health issued

Foreword

Appendix A of this standard is a normative appendix. National Food Safety Standard Food additives disodium dihydrogen pyrophosphate

1 Scope

This standard applies to soda ash, caustic sodium hydroxide or sodium dihydrogen phosphate, one of thermal phosphoric acid and food additive prepared by the reaction dihydrogen pyrophosphate Disodium.

2 Normative references

The standard file referenced in the application of this standard is essential. For dated references, only the dated edition of fitness For this standard. For undated references, the latest edition (including any amendments) applies to this standard.

3 formula and relative molecular mass

Formula 3.1 Na2H2P2O7 3.2 relative molecular mass 221.94 (according to 2007 international relative atomic mass) 4. Technical Requirements 4.1 Sensory requirements. comply with Table 1. Table 1 Sensory requirements Project requires test methods Color White take appropriate sample is placed in 50mL beaker, observe the color and set in natural light Woven state. Organization Status powder 4.2 Physical indicators. to comply with Table 2. Table 2. Physical and chemical indicators Item Index Test Method Disodium dihydrogen pyrophosphate (Na2H2P2O7), w /% 93.0 ~ 100.5 Appendix A A.4 Water-insoluble, w /% ≤ 1.0 A.5 in Appendix A Arsenic (As)/(mg/kg) ≤ 3 Appendix A A.6 Heavy metals (Pb)/(mg/kg) ≤ 10 Appendix A A.7 Lead (Pb)/(mg/kg) ≤ 2 Appendix A A.8 Fluorides (as F)/(mg/kg) ≤ 50 Appendix A A.9 pH (10g/L solution) 4.0 ± 0.5 A.10 Appendix A

Appendix A

(Normative) Testing method A.1 Safety Tips Reagents The standard test methods used for toxic or corrosive, the operation should be careful as the water splashed on the skin should immediately Flushing, severe cases should immediately heal. A.2 General Provisions The standard test methods used in the reagents and water in the absence of other specified requirements, refer to analytically pure reagents and GB/T 6682-2008 in Regulation Given three water. Used in the test standard titration solution, impurity standard solution, preparations and products, did not indicate when the other requirements, according to HG/T 3696.1, HG/T 3696.2, HG/T 3696.3 regulations of preparation. A.3 Identification Test A.3.1 Reagents and materials A.3.1.1 nitric acid solution. 19. A.3.1.2 Quimociac solution. A.3.2 Analysis A.3.2.1 Identification of pyrophosphate Sample solution A.3.2.1.1. 0.1g sample was dissolved in 100mL the nitric acid solution. A.3.2.1.2 Test solution A. in 30mL Quimociac added dropwise 0.5mL sample solution. A.3.2.1.3 Test solution B. The remaining sample solution was heated at 95 ℃ 10min, take 0.5mL of this solution was added dropwise 30mL Quimociac solution. A.3.2.1.4 determination. Test solution B immediately formed yellow precipitate A test solution does not appear. A.3.2.2 Identification of sodium ions Weigh 1g sample, add water to dissolve 20mL. Platinum wire ring dipped in hydrochloric acid, in a colorless flame to burn. And then dipped in the test solution on the flame Combustion, the flame should be bright yellow. A.4 Determination of disodium dihydrogen pyrophosphate A.4.1 Method summary Samples under acidic conditions to generate zinc pyrophosphate precipitate zinc sulfate and sulfuric acid reacts with the titration solution titrated with standard sodium hydroxide generated sulfur Acid, disodium dihydrogen pyrophosphate calculated content. A.4.2 Reagents and materials A.4.2.1 hydrochloric acid solution. 110. A.4.2.2 zinc sulfate solution. 125g/L; Weigh 125g of zinc sulfate (ZnSO4 • 7H2O), was dissolved in water and diluted to 1000mL, with the acidity of the sulfuric acid solution (1500) or hydroxide Sodium Standard Solution (A.4.2.4) and the solution was adjusted to pH 3.8. A.4.2.3 anhydrous sodium pyrophosphate (pyrophosphate recrystallized three times); a) of anhydrous sodium pyrophosphate as an industrial method for preparing the starting material. The first crystallization. Weigh 30g of industrial anhydrous sodium pyrophosphate, placed in 400mL beaker, add 100mL water dissolved by heating with constant speed Quantity filter paper. The filtrate was cooled in a cold water bath, crystalline precipitation, the solution was decanted, washed with a small amount of water and crystallized twice. Second crystallization. the first crystallization with a small amount of water dissolved by heating in a cold water bath cooling, precipitated crystals were decanted solution. Third Crystallization. the second crystallization method according to the first crystallization recrystallization once. b) reagent sodium pyrophosphate decahydrate method of preparing a raw material. 80g of sodium pyrophosphate decahydrate reagent, according to a) in the first and second crystallization operations. The above recrystallization sodium pyrophosphate into a porcelain crucible, at 400 ℃ for burning to a constant quality. A.4.2.4 sodium hydroxide standard titration solution. c (NaOH) = 0.1 mol/L; Calibration. Weigh about 0.3g of anhydrous sodium pyrophosphate, accurate to 0.000 2g. Placed in 150mL beaker, add 50mL of carbon dioxide-free water Dissolved. Hydrochloric acid was added with stirring the solution was adjusted to the pH value of 3.8, then press the step A.4.4, from "zinc sulfate solution was added 25mL" Begin calibration. 0.1 mol per ml/L sodium hydroxide standard titration solution corresponds to the mass of disodium dihydrogen pyrophosphate (ρ) according to formula (A.1) Calculated. m8345.0 = ρ (A.1) Where. Numerical m-- anhydrous sodium pyrophosphate mass in grams (g); Numerical sodium hydroxide standard titration solution consumed V-- calibration volume in milliliters (mL); 0.8345-- sodium pyrophosphate, disodium dihydrogen pyrophosphate conversion factor. A.4.3 Instruments and Equipment pH meter. Indexing is 0.02. A.4.4 Analysis step Weigh about 0.3g sample, accurate to 0.000 2g, placed in 150mL beaker, add 50mL of carbon dioxide-free water, heating the sample Dissolved. On the pH meter with hydrochloric acid solution was adjusted to pH 3.8 solution. 25mL zinc sulfate solution was added and stirred for 3min. Stirring with hydrogen Sodium hydroxide standard titration solution titrated to pH 3.8 solution, namely to the finish. A.4.5 Calculation Results Disodium dihydrogen pyrophosphate content in disodium dihydrogen pyrophosphate (Na2H2P2O7) mass fraction w1 and its value is expressed in%, according to formula (A.2) Calculated. 01 × = m Vw ρ (A.2) Where. ρ-- per milliliter of sodium hydroxide standard titration solution is equivalent to the value of disodium dihydrogen pyrophosphate, in grams per milliliter (g/mL); Numerical sodium hydroxide standard titration solution consumed V-- titration solution volume in milliliters (mL); m-- sample mass value in grams (g). Take the arithmetic mean of the parallel determination results of the measurement results, the results of two parallel determination of the absolute difference is not more than 0.3%. A.5 Determination of insoluble matter A.5.1 Instruments and Equipment A.5.1.1 sintered glass crucible. filter plate pore size of 5μm ~ 15μm. A.5.1.2 electric oven. the temperature can be controlled at 105 ℃ ± 2 ℃. A.5.2 Analysis step Weigh about 5g samples, accurate to 0.01g, set 400mL beaker, add 200mL water and dissolved by heating with constant quality in advance of glass Crucible sand filtration, washed with hot water until the filtrate was neutral, with a pH test paper. The glass sand crucible together with water-insoluble substance placed 105 ℃ ± 2 ℃ Power Thermostatic oven heat, drying to constant mass. A.5.3 Calculation Results Water-insoluble mass fraction w2 and its value is expressed in%, according to formula (A.3) Calculated. 0212 × - = m mmw (A.3) Where. Numerical m1-- quality water insoluble sand and glass crucible, in grams (g); Numerical m2-- quality glass sand crucible in grams (g); m - sample mass value in grams (g). Take the arithmetic mean of the parallel determination results of the measurement results. Two parallel determination results is not more than 0.1% absolute difference. A.6 Determination of Arsenic Weigh 0.50g ± 0.01g sample was placed in 100mL beaker, add 20mL of water and 10mL of hydrochloric acid solution (11), heating dissolved, the whole Unit was transferred to measure arsenic bottle, add water to a total volume of about 40mL, according to GB/T 5009.76-2003 Chapter 11 in the second predetermined operation. Limits formulated solution. Pipette 1.50mL [1mL solution of arsenic (As) 0.001mg] arsenic standard solution, and treated in the same sample at the same time. A.7 Determination of Heavy Metals Weigh 5.00g ± 0.01g sample was placed in 100mL beaker, add 80mL water, heated to dissolve moved to 100mL volumetric flask with water Dilute to volume, and mix. With two layers of filter paper filter medium, the initial 20mL filtrate was discarded by pipette test solution to take 20.00mL In 50mL colorimetric tube. Add 1 drop of phenolphthalein indicator solution (10g/L), with sodium hydroxide solution (40g/L) was adjusted to neutral solution, add water to total Volume of about 30mL, according to GB/T 5009.74-2003 Chapter 6 operation. Color than the standard preparation solution. Pipette 1.00mL [1mL solution containing lead (Pb) 0.01mg] lead standard solution, and treated in the same sample at the same time. A.8 Determination of Lead A.8.1 Reagents and materials A.8.1.1 hydrochloric acid. A.8.1.2 nitrate. A.8.1.3 chloroform. A.8.1.4 sodium hydroxide solution. 250g/L. A.8.1.5 Pyrrolidine dithiocarbamate solution (APDC). 20g/L. Filtered before use. A.8.1.6 Lead standard solution. 1mL solution containing lead (Pb) 0.010mg; Pipette Pipette 1.00mL lead standard solution according to HG/T 3696.2 prepared, placed in 100 mL volumetric flask, dilute with water to the mark, Mix well. This solution is using now. A.8.1.7 two water. in line with GB/T 6682-2008 specified. A.8.2 Instruments and Equipment Atomic absorption spectrophotometer. with lead hollow cathode lamp. A.8.3 Analysis step A.8.3.1 Preparation of test solution Weigh 10.0g ± 0.01g sample was placed in 150mL beaker. Add 30mL of water and a minimum amount of hydrochloric acid to dissolve the sample, excess hydrochloric acid 1mL Ensure sample dissolution. Heated to boiling for a few minutes, cooled, diluted with water to 100mL, pH of the solution adjusted with sodium hydroxide solution to 1.0 to 1.5, The solution was transferred to quantitatively 250mL separatory funnel, diluted with water to about 150mL. Add 2mL Pyrrolidine dithiocarbamate solution (APDC), and mixed. Extracted twice with chloroform, was added per 20 mL, was collected in 50mL beaker extract was evaporated on a boiling water bath Near dryness, the residue was added 3mL of nitric acid, heating nearly dry. Then add 0.5mL nitric acid and 10mL water, heated to left 3 mL ~ 5 mL. The nitrification The extract was transferred to a 10mL volumetric flask, dilute to the mark, shake. A.8.3.2 Preparation of the blank test solution Take 30 mL water were placed in a 150 mL beaker, add 1 mL of hydrochloric acid. The following operation is the same in A.8.3.1 "boil a few minutes heating, cooling, Diluted with water to 100 mL transferred to a 10 mL volumetric flask, dilute with water to the mark. " A.8.3.3 Preparation of standard solutions Pipette 2.00 mL of lead standard solution was placed in a 150 mL beaker, add 1 mL of hydrochloric acid. The following operation is the same A.8.3.1 in "a few heated to boiling Minutes, cooled, diluted to 100 mL extracts were transferred to a 10 mL nitration volumetric flask, diluted with water to the mark. " A.8.3.4 Determination A.8.3.4.1 instrument conditions. resonance line of 283.3 nm; slit 0.7 nm; air - acetylene flame. A.8.3.4.2 Determination. The test solution, standard solution to import atomic absorption spectrophotometer, zero blank test solution, the test solution The absorption value can not be higher than the standard solution absorbance. A.9 Determination of fluoride A.9.1 Method summary After the dissolution of the sample, at a pH of 5.5 to 6.0 acidic medium, a saturated calomel electrode as the reference electrode to fluoride ion selective electrode to measure Fixed electrode, the determination of fluorine content by working curve method. A.9.2 Reagents and materials A.9.2.1 hydrochloric acid solution. 1 + 4. A.9.2.2 nitric acid solution. 1 + 15. A.9.2.3 sodium hydroxide solution. 100g/L. A.9.2.4 buffer solution. dissolve 270g sodium citrate dihydrate (Na3C6H5O7 • 2H2O) and 24g of citric acid (C6H5O7 • 2H2O) was dissolved in 800 mL of water And then diluted with water to 1000mL, shake. A.9.2.5 fluoride standard solution. 1mL solution of fluorine (F) 0.010 mg; Pipette Pipette 1.0mL fluoride standard solution according to HG/T 3696.2 prepared, placed in 100mL volumetric flask, dilute to the mark, Shake well. A.9.2.6 bromocresol green indicator solution. 1g/L. A.9.3 Instrument and equipment A.9.3.1 fluoride ion selective electrode. A.9.3.2 saturated calomel electrode. A.9.3.3 potentiometer. A.9.4 Analysis step A.9.4.1 draw the curve Pipette pipette 1.00 mL, 2.00 mL, 4.00mL, 6.00 mL, 8.00m L, 10.00 mL of fluoride standard solution were placed Six 50 mL flask, add 1mL hydrochloric acid solution, 5 drops of buffer solution, 2 drops of potassium bromine phenol green indicator solution. The solution was adjusted with sodium hydroxide solution Blue, yellow and then adjusted to a nitric acid solution plus 20 mL of buffer solution, diluted with water to the mark. The fluoride ion selective electrode and calomel electrode and the potentiometer negative and a positive terminal coupled to the electrode insert filled with water 50 mL polyethylene plastic beaker, pre Thermal instrumentation, on a magnetic stirrer with constant stirring, to read the value of the equilibrium potential, 2 to 3 times to replace the water, to reach a predetermined electrode manual After the potential value to the standard working solution and the potential of the sample solution was measured. The standard working solution was poured into a dry 50 mL beaker placed on a magnetic stirrer, stirring into the insert fluoride ion selective electrode and Saturated calomel electrode, stirred for a while, adjusting potentiometer zero balance when recording potential value. Fluoride concentrations in logarithmic value as the horizontal phase Should the potential value of the vertical axis, draw the working curve. A.9.4.2 Determination Weigh about 1g sample to the nearest 0.000 2g. Placed in 50 mL volumetric flask, add 10 mL of water, following in A.9.4.1 self "plus 1mL Hydrochloric acid solution "to" the potential value of the recording equilibrium "stop. Isolated fluoride content corresponding to the value obtained from the antilog demand curve The mass of fluoride ion. A.9.5 Calculation Results Fluoride content of fluorine (F) mass fraction w3 and its value in mg/kg according to formula (A.4) Calculated. 3 100 - × = m mw (A.4) Where. Numerical m1-- test solution fluoride ion mass, in milligrams (mg); m-- sample mass value in grams (g). Take the arithmetic mean of the parallel determination results of the measurement results, the results of two parallel determination of the absolute difference is not more than 5mg/kg. A.10 pH measurement of A.10.1 instruments and equipment pH meter. Indexing is 0.02. A.10.2 Analysis steps Weigh 1.0g ± 0.01g sample was placed in 150mL beaker, add 100mL water dissolved, has been calibrated pH meter was measured.

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