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GB/T 24396-2009 PDF English

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GB/T 24396-2009: Test Method of Adsorption Resin for Food Industrial Use
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GB/T 24396-2009: Test Method of Adsorption Resin for Food Industrial Use

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NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 67.250 G 31 Test Method of Adsorption Resin for Food Industrial Use Issued on. SEPTEMBER 30, 2009 Implemented on. DECEMBER 01, 2009 Issued by. General Administration of Quality Supervision, Inspection and Quarantine; Standardization Administration of the People's Republic of China.

Table of Contents

Foreword... 3 1 Scope... 4 2 Method summaries... 4 3 Reagents and materials... 4 4 Instruments and equipment... 5 5 Analysis steps... 5 Appendix A (Informative) Organic residue determination reference gas chromatography operating conditions... 10

Foreword

Appendix A of this Standard is an informative appendix. This Standard was proposed and managed by China National Institute of Standardization. The drafting organizations of this Standard. Tianjin Product Quality Supervision and Testing Technology Research Institute. Organizations that participate in the drafting of this Standard. Tianjin Ourui Biological Technology Co., Ltd. The drafters of this Standard. Bian Hui, Hong Yuchun, Liu Shuang, Tong Lili, Ren Lihua, Ou Lailiang, Wu Qian, Yang Jialing. Test Method of Adsorption Resin for Food Industrial Use

1 Scope

This Standard specifies the test method of adsorption resin for food industrial use. This Standard applies to the determination of appearance, heavy metals and organic residues in adsorption resin for food industrial use that is copolymerized under the action of initiator, of which, the polymeric monomer is styrene, divinylbenzene, acrylics, acrylonitrile, and the pore-foaming agent is toluene or liquid paraffin.

2 Method summaries

2.1 Heavy metal detection In the weak-acidic solution, sodium sulfide precipitates heavy metal ions into the corresponding sulfides; the resulting color is visually compared to the standard color. 2.2 Organic residue detection The organic residue in the sample is ultrasonically extracted by absolute ethanol; it is injected into the gas chromatograph and carried by the carrier gas into the column for separation; the effluent is detected by a hydrogen flame ionization detector; the content of organic residue is calculated according to the external standard method.

3 Reagents and materials

WARNING. Some of the reagents which are used in this test method are toxic or corrosive; therefore, some test procedures may cause dangerous conditions, and the operator shall take appropriate safety and health measures. 3.1 Hydrochloric acid. analytical reagent. 3.2 Acetic acid solution. 1 + 4. 3.3 Sodium sulfide solution. 100 g/L.

4 Instruments and equipment

4.1 Oven. 4.2 Muffle furnace. 4.3 Water bath. 4.8 Centrifuge. 0 r/min ~ 4 000 r/min (adjustable). 4.9 Brown volumetric flasks. 100 mL, 50 mL, and 10 mL. 4.10 Pipette. 1 μL ~ 10 μL, 10 μL ~ 100 μL, 100 μL ~ 1 000 μL and 0.5 mL ~ 5 mL. 4.11 Pipette. 5 mL, 10 mL. 4.12 Needle filter. 0.45 µm.

5 Analysis steps

5.1 Determination of appearance Place the sample in a clean white porcelain dish; place it in a bright place, and visually inspect it under natural light. 5.2 Determination of heavy metal 5.2.1 Preparation of test solution Weigh 2.0 g of sample (dry basis) which is dried at 105°C ± 2°C for 2 h; accurate to 0.01 g; place it in the evaporating dish; carbonize it and then burn it at 500°C ± 25°C until the complete ashing; cool it; then, add 2 mL of hydrochloric acid; 5.2.2 Preparation of lead (Pb) standard colorimetric solution Transfer 2 mL of acetic acid solution into a 50 mL colorimetric tube (matching tube A); add 1.50 mL of lead standard solution; add water to 25 mL, which is the tube B. 5.3 Determination of organic residue 5.3.1 Preparation of samples Place 10 mL of the sample in a centrifuge tube; centrifuge at 2000 r/min ± 200 r/min for 5 min. Take the upper layer of the sample from which the surface free water has been removed 5.3.2 Preparation of standard solution 5.3.2.1 Preparation of mixed standard solution mother solution According to the order of styrene, o-xylene, m-xylene, p-xylene, chlorobenzene, toluene, methyl methacrylate, divinylbenzene, 1,2-dichloroethane, benzene, acrylonitrile, weight 0.1 g of each of the above standards (accurate to 0.000 1 g); place in a 100 mL brown volumetric flask; use absolute ethanol to dilute to the mark; shake well. 5.3.3 Determination of standard series solution Turn on the gas chromatograph and set the chromatographic conditions according to Appendix A. After the baseline is stable, take the series standard solutions which are prepared in 5.3.2.2 for injection analysis; record the peak area of each time; draw the following standard curve. 5.3.4 Determination of the sample Take the sample solution that is prepared in 5.3.1 for injection analysis; record the chromatographic peak area; according to the concentration range of each residue in the sample, substitute the appropriate standard curve to find the corresponding residue mass concentration ρ (μg/mL). 5.3.5 Calculation of analysis result Calculate the content of residues in the sample according to Formula (1).

Appendix A

(Informative) Organic residue determination reference gas chromatography operating conditions According to the used gas chromatograph, adjust the appropriate temperature and flow rate to achieve the proper separation effect. Reference chromatographic conditions are shown as below. ......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.


      

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