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GB 25570-2010 English PDF

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GB 25570-2010: National food safety standards of food additives potassium metabisulfite
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Basic data

Standard ID GB 25570-2010 (GB25570-2010)
Description (Translated English) National food safety standards of food additives potassium metabisulfite
Sector / Industry National Standard
Classification of Chinese Standard X42
Classification of International Standard 67.220.20
Word Count Estimation 9,994
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 a saturated solution of potassium hydroxide or potassium carbonate absorption of sulfur oxidation of sulfur dioxide and the production of food additives potassium metabisulfite.

GB 25570-2010: National food safety standards of food additives potassium metabisulfite

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National food safety standards of food additives potassium metabisulfite National Food Safety Standard Food additive potassium metabisulfite 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 additive potassium metabisulfite

1 Scope

This standard applies to a saturated solution of potassium hydroxide or potassium carbonate absorption of sulfur dioxide oxidation of sulfur and the production of food additives metabisulfite Potassium.

2 Normative reference standard

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 K2S2O5 3.2 relative molecular mass 222.32 (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 White or slightly yellow color proper amount of sample is placed in 50mL beaker was observed under natural light Color and texture. State organization crystalline powder 4.2 Physical indicators. to comply with Table 2. Table 2. Physical and chemical indicators Item Index Test Method Potassium metabisulfite (in K2S2O5 dollars), w /% ≥ 93.0 Appendix A A.4 Iron (Fe)/(mg/kg) ≤ 10 Appendix A A.5 Clarity through test A.6 in Appendix A Arsenic (As)/(mg/kg) ≤ 2 Appendix A A.7 Heavy metals (Pb)/(mg/kg) ≤ 5 Appendix A A.8 Lead (Pb)/(mg/kg) ≤ 2 Appendix A A.9 Selenium (Se)/(mg/kg) ≤ 5 Appendix A A.10

Appendix A

(Normative) Testing method A.1 Warning 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, did not indicate when the other requirements, refer to analytically pure reagents and GB/T 6682-2008 in Three water regulations. 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 hydrochloric acid. A.3.1.2 hydrochloric acid solution. 13. A.3.1.3 iodine solution. take 1.4 g iodine, placed in 10 mL of potassium iodide solution, add two drops of hydrochloric acid, dissolved in water and diluted to 100 mL, stored in Brown bottle stored. A.3.1.4 mercury nitrate solution. take 15 g of mercury nitrate Asia, add 90 mL of water, 10 mL solution of nitric acid (19) was dissolved, add a drop of mercury, dark Sealed and stored for later use. A.3.2 Analysis step A.3.2.1 Identification sulfite After the sample solution was added iodine solution that is faded yellow. Aqueous hydrochloric acid solution was dropped after the sample has a sulfur dioxide gas to escape to Asia mercury nitrate solution infiltrating dipstick test, which was black. A.3.2.2 Identification of potassium ions Infiltration of platinum wire with hydrochloric acid to colorless in the first combustion colorless flame. Then dipped a little sample solution in a colorless flame combustion, cobalt glass Observed was purple. A.4 Determination of potassium metabisulfite A.4.1 Method summary In weak acid solution, the iodine sulfite oxidized to sulfate. Starch as indicator, titrated with sodium thiosulfate standard solution titration Excess iodine. A.4.2 Reagents and materials A.4.2.1 glacial acetic acid. 13. A.4.2.2 iodine standard solution. c (1/2I2) ≈0.1 mol/L. A.4.2.3 sodium thiosulfate standard titration solution. c (Na2S2O3) = 0.1 mol/L. A.4.2.4 soluble starch solution. 5 g/L. A.4.3 Analysis step Pipette 50 mL of iodine standard solution and placed iodine bottle. Weigh about 0.2 g samples, accurate to 0.000 2 g, was added to the iodine solution, add Plug, seal, place 5 min in the dark. When added 5 mL glacial acetic acid, sodium thiosulfate standard titration solution titration, near the end, add 2mL soluble starch solution and continue titration to the disappearance of the blue solution as the end point. At the same time a blank test. In addition to the blank test without the sample, the addition of reagents and other operations of the kind and amount (other than the standard titration solution) with the same measurement sample. A.4.4 Calculation Results Potassium metabisulfite (K2S2O5) mass fraction w1 and its value is expressed in%, according to formula (A.1) Calculated. () 1 × - = cMVV w (A.1) Where. Numerical sodium thiosulfate standard titration V0-- blank test solution consumed volume in milliliters (mL); Numerical sodium thiosulfate standard titration solution consumed V1-- titration solution volume in milliliters (mL); Accurate c-- sodium thiosulfate standard titration solution concentration value in units of moles per liter (mol/L); m-- sample mass value in grams (g); Numerical M-- potassium metabisulfite (1/4K2S2O5) molar mass in grams per mole (g/mol) (M = 55.58). 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 0.2%. A.5 Determination of iron A.5.1 Reagents and solutions With GB/T 3049-2006 Chapter 4 A.5.2 Instruments and Equipment With GB/T 3049-2006 of Chapter 5 A.5.3 Analysis step A.5.3.1 draw the curve According to GB/T 3049-2006 6.3 using 1cm path length cuvette and the corresponding amount of iron standard solution, drawing working curve. A.5.3.2 Preparation of test solution Weigh about 2g samples, accurate to 0.01g. 250mL beaker and placed on a high type, with a small amount of water dissolved, 25mL hydrochloric acid solution in a boiling water bath Evaporated to dryness. The residue was dissolved in water, all transferred to 250mL volumetric flask, dilute with water to the mark. A.5.3.3 Preparation of the blank test solution High type in 250mL beaker, add a small amount of water, plus 25mL of hydrochloric acid in a boiling water bath to dryness, the residue was dissolved in water, all moved 250mL Volumetric flask, dilute to the mark, shake. A.5.3.4 Determination Pipette pipette 50.00mL test solution and the blank test solution were placed in 100mL flask, the following according to GB/T 3049-2006 of 6.4.1 from the "if necessary, add water to 60mL" to get started. A.5.4 Calculation Results Iron content of iron (Fe) mass fraction w2 and its value in mg/kg according to formula (A.2) Calculated. () 3212 1025050 - ×× - = mmw (A.2) Where. Numerical test solution iron quality m1-- from the working curve of Richard, in milligrams (mg); Numerical blank test solution of iron in quality from the working curve m2-- Richard, in units of milligrams (mg); m - mass of the sample value in units of grams (g). Take the arithmetic mean of the parallel determination results of the measurement results. Two parallel determination results of absolute difference is not more than 2mg/kg. A.6 Determination of Clarity A.6.1 Reagents and materials A.6.1.1 nitric acid solution. 13. A.6.1.2 silver nitrate solution. 20 g/L. A.6.1.3 soluble starch solution. 20 g/L. A.6.1.4 hydrochloric acid standard solution. c (HCl) = 0.1 mol/L. A.6.1.5 chlorine standard stock solution. 1 mL solution of chlorine (Cl) 1 mg; Pipette 14.1 mL standard solution of hydrochloric acid, a 50mL volumetric flask, dilute to the mark. A.6.1.6 chlorine standard solution. 1 mL solution of chlorine (Cl) 0.01 mg; Pipette 1mL chlorine standard stock solution, placed in 100mL volumetric flask, dilute to the mark. This solution is using now. A.6.2 Analysis step Weigh 0.50g ± 0.01g sample was placed in 25 mL colorimetric tube, add 10 mL of water to dissolve and dilute to the mark. Turbidity test solution should Lower than the standard turbidity solution. Turbidity standard solution. Pipette 1.2 mL chlorine standard solution, placed in 25 mL colorimetric tube, add water to 20 mL, add 1 mL solution of nitric acid, 0.2 mL solution of soluble starch, 1 mL of silver nitrate solution, shake, dilute to the mark, place 15 min. A.7 Determination of Arsenic Weigh 1.00g ± 0.01g sample was placed in a conical flask, wetted with water, neutralized with hydrochloric acid to neutral (pH paper test with), and then the excess 5mL, shake. Pipette Pipette 2mL arsenic standard solution [1mL solution containing arsenic (As) 0.001mg] as standard, placed in another conical flask in. Each 5mL was added hydrochloric acid solution (13). And then follow the GB/T 5009.76─2003 first Law "Silver diethyl dithiocarbamate colorimetric Law "6.2 limited test operation, or determined in accordance with GB/T 5009.76─2003 of Chapter 11. Diethyl dithiocarbamate silver arbitration colorimetric method. A.8 Determination of Heavy Metals Weigh 2.00g ± 0.01g sample, placed in 100 mL beaker, add 5 mL of water to dissolve, add 2 mL of hydrochloric acid and evaporated to dryness on a water bath. Add 5 mL Water, 1 mL of hydrochloric acid, and then evaporated to dryness on a water bath. Add 0.5 mL glacial acetic acid, 20 mL of water to dissolve the residue, was added 1 drop of phenolphthalein indicator solution, Ammonia (11) was adjusted to pink, the following according to GB/T 5009.74-2003 Chapter 6 were measured. Standard colorimetric solution. pipette Pipette 1.00mL lead standard solution [1 mL solution containing lead (Pb) 0.010mg], placed in 50 mL Nessler colorimetric Tube, add 0.5 mL glacial acetic acid, 20 mL of water, add 1 drop of phenolphthalein indicator solution, aqueous ammonia (11) was adjusted to pink, the following according to GB/T 5009.74 -2003 Chapter 6 were measured. A.9 Determination of Lead Weigh 5.00g ± 0.01g sample was placed in a 150 mL beaker, add 20 mL of water dissolved, add 1 mL solution of nitric acid (11) in a water bath On evaporated to dryness. The following press GB/T 5009.75-2003 Chapter 6 were measured. A.10 Determination of Selenium Weigh 5.00g ± 0.01g sample was placed in a 150 mL beaker, add 20 mL of water dissolved, add 1 mL solution of nitric acid (11) in a water bath On evaporated to dryness. The following press GB 5009.93-2010 hydride atomic fluorescence spectrometry determination. --------

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