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GB 1886.300-2018 English PDF (GB1886.300-2018)

GB 1886.300-2018 English PDF (GB1886.300-2018)

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GB 1886.300-2018: National food safety standard -- Food additive ion exchange resin

This standard applies to food additive ion exchange resins.
GB 1886.300-2018
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
National food safety standard - Food additives -
AMBERLITE XAD-16
ISSUED ON: JUNE 21, 2018
IMPLEMENTED ON: DECEMBER 21, 2018
Issued by: National Health Commission of PRC;
State Administration for Market Regulation.
Table of Contents
1 Scope ... 3
2 Definitions ... 3
3 Technical requirements ... 3
Appendix A Testing method ... 4
National food safety standard - Food additives -
AMBERLITE XAD-16
1 Scope
This standard applies to food additive ion exchange resins.
2 Definitions
Ion exchange resin is a synthetic resin, which has cross-linked structure containing ionic functional groups, that can exchange with the same-sex charges in the solution. It consists of two parts: the polymer skeleton and the functional group.
3 Technical requirements
3.1 Sensory requirements
Sensory requirements shall meet the requirements in Table 1.
State State solid particles, powder, suspension Put the specimen in a white-bottom plate, visual inspection 3.2 Physical-chemical indicators
The physical-chemical indicators shall meet the requirements in Table 2. 3.3 Performance indicators
Performance indicators shall meet the requirements in Table 3.
Appendix A
Testing method
A.1 General provisions
The reagents used in this standard refer to analytical reagents, unless otherwise specified. The experimental water is treated according to the requirements for dilution water in GB/T 5750.7, which is prepared by reverse osmosis, deionization or distillation; then filtered by activated carbon; finally must not contain free chlorine. The conductivity at 25 ??C is less than 0.2 ??S/cm; the total organic carbon (TOC) is less than 0.5 mg/L. The solution used in the test refers to the aqueous solution, when the solvent used for the preparation is not indicated.
A.2 Identification test
A.2.1 Method summary
A.2.2 Reagents and materials
A.2.2.1 Hydrochloric acid solution: 10% hydrochloric acid solution.
A.2.2.2 Potassium hydroxide solution: About 1 mol/L.
A.2.2.3 Diluted acetic acid solution: About 1 mol/L.
A.2.2.4 Sodium cobalt nitrite solution: Weigh 10 g of sodium cobalt nitrite and dissolve it in water. Dilute it to 50 mL. Filter it if necessary.
A.2.2.5 Sodium hydroxide solution: About 1 mol/L.
A.2.2.6 Diluted nitric acid solution: Take 105 mL of 70% nitric acid solution. Use water to dilute it to 1000 mL.
A.2.2.7 Silver nitrate solution: Weigh 1.7 g of silver nitrate and dissolve it in water. Use water to dilute it to 100 mL.
A.2.3 Instruments and equipment
Glass chromatography tubes.
A.2.4 Identification method
A.2.4.1 Identification test of cation exchange resin
Take 5 mL of the specimen. Put it into a glass chromatography tube, which has an inner diameter of about 1 cm. Put it together with water, to make a resin column. Add 25 mL of 10% hydrochloric acid. Make it flow out at a rate of 5 mL/min. Then use 100 mL of water to wash it, at the same flow rate. Then use 25 mL of potassium hydroxide solution to flow out, at the same flow rate. Finally use 75 mL of water to flow out, at the same flow rate. Take 5 mL of this washing solution. Add 2 mL of dilute acetic acid solution and 3 drops of sodium cobalt nitrite solution; no yellow turbidity will occur. Take 2 mL of the resin from the chromatography tube. Transfer it into a test tube. Add 5 mL of 10% dilute hydrochloric acid. Shake for 5 minutes and filter. Use water to wash the resin on the filter paper. Combine the filtrate and washing liquid. Take 5 mL. Add 4 mL of sodium hydroxide solution. Shake to mix it. Add 2 mL of dilute acetic acid solution. Then add 3 drops of sodium cobalt nitrite solution; a yellow precipitate shall occur. A.2.4.2 Identification test of anion exchange resin
Take 5 mL of the specimen. Put it into a glass chromatography tube, which has an inner diameter of about 1 cm. It can be contained together with water, to make a resin column. Add 25 mL of 10% hydrochloric acid. Make it flow out, at a speed of 5 mL/min. Then use 100 mL of water to wash it, at the same flow rate. Take 5 mL of this washing solution. Add 1 mL of dilute nitric acid solution. Then add 3 drops of silver nitrate solution; no white turbidity shall occur. Take 1 mL of the resin from the chromatography tube. Transfer it into a test tube. Add 3 mL of sodium hydroxide solution. Shake for 5 min and filter. Use water to wash the resin on the filter paper. Combine the filtrate and washing solution. Take 5 mL. Add 3 mL of dilute nitric acid solution. Then add 3 drops of silver nitride solution; a white precipitate shall appear.
A.3 Determination of total organic carbon (TOC) increase
A.3.1 Method summary
After the resin is soaked in experimental water for 24 hours, it is rinsed by experimental water. The collected eluents of different fractions are determined, by a total organic carbon analyzer.
A.3.2 Reagents and materials
A.3.2.1 Hydrochloric acid solution: 1 + 1.
A.3.2.2 Nitric acid solution: 1 + 1.
A.3.3 Instruments and equipment
A.3.3.1 Total organic carbon analyzer. The minimum detection mass concentration is 0.5 mg/L.
A.3.3.2 Rinsing test equipment: See Figure A.1.
milliliters (mL);
V1' - The volume of sulfuric acid solution, which is consumed by the specimen, in milliliters (mL);
cx - The concentration of sulfuric acid solution, in mole per liter [c(1/2H2SO4), mol/L];
W1 - The mass of the standard sample, in grams (g);
G1 - The solid content of the sample, %;
100 - Conversion coefficient of solid content;
50 - The ratio of the total amount of sodium hydroxide solution 500 mL to the upper clear solution 10 mL.
A.4.2 Determination of total exchange capacity of anion exchange resin
A.4.2.1 Reagents and materials
A.4.2.1.1 Hydrochloric acid solution: 0.2 mol/L.
A.4.2.1.2 Sodium hydroxide solution: 0.1 mol/L.
A.4.2.1.3 Phenolphthalein test solution: Dissolve 1 g of phenolphthalein in 100 mL of ethanol. Then use water to titrate it to 100 mL.
A.4.2.2 Analytical procedures
A.4.2.2.1 Preparation of standard samples
Take 25 mL of the specimen, in a chromatographic tube, which has an inner diameter of about 3 cm. Use 1000 mL of 4% sodium hydroxide solution, to rinse it, at a rate of 15 mL to 20 mL per minute. Then use experimental water to flow out at the same speed, until every 2 mL ~ 3 mL of eluent does not turn red to the phenolphthalein test solution; use it as a standard sample (OH type).
A.4.2.2.2 Test
The standard sample is fully impregnated with experimental water; then the attached water is absorbed by filter paper for later use.
First weigh 10 g of the standard sample; dry it to constant weight at 105 ??C ?? 3 ??C; measure the solid content G2 (%).
Then accurately weigh about 5 g of the standard sample. Immerse it in 500 mL hydrochloric acid solution. Shake and mix frequently. After standing for 12 hours, take

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