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GB 5009.76-2014 PDF English

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GB 5009.76-2014: National food safety standard - Determination of arsenic in food Additives
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GB 5009.76: Historical versions

Standard IDUSDBUY PDFDeliveryStandard Title (Description)Status
GB 5009.76-201485 Add to Cart Auto, 9 seconds. National food safety standard - Determination of arsenic in food Additives Valid
GB/T 5009.76-2003279 Add to Cart 3 days Determination of arsenic in food additives Obsolete

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GB 5009.76-2014: National food safety standard - Determination of arsenic in food Additives

---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GB5009.76-2014
GB NATIONAL STANDARD National food safety standard - Determination of arsenic in food additives Issued on. SEPTEMBER 21, 2015 Implemented on. MARCH 21, 2016 Issued by. National Health and Family Planning Commission of the PRC

Table of Contents

Foreword... 3 1 Scope... 4 2 Principles... 4 3 Reagents and materials... 4 4 Instruments... 6 5 Sample treatment... 8 6 Determination... 9 7 Expression of analytical results... 10 8 Precision... 11 9 Principles... 11 10 Reagent... 11 11 Instruments... 13 12 Analytical procedures... 13 13 Expression of analytical results... 15 14 Precision... 15 15 Others... 16

Foreword

This standard replaces GB/T 5009.76-2003 “Determination of arsenic in food additives”. As compared with GB/T 5009.76-2003, the main changes of this standard are as follows. - CHANGE the standard name into “National food safety standard – Determination of arsenic in food additives”; - DELETE the arsenic spot method; - ADD the hydride atomic fluorescence determination method, as the method 2. National food safety standard - Determination of arsenic in food additives

1 Scope

This standard specifies the determination of arsenic in food additives. This standard applies to the determination of arsenic in food additives. Method 1.Diethylamino dithiocarbamate colorimetric method

2 Principles

In the presence of potassium iodide and stannous chloride, the high valence arsenic in the sample solution is reduced to trivalent arsenic, AND the trivalent arsenic reacts with the newly generated hydrogen which is produced by the zinc particles and acid, to produce arsine gas;

3 Reagents and materials

Note. Unless otherwise stated, the reagents used in this method are of analytical pure AND the water is level 1 water as specified in GB/T 6682. 3.1 Reagents 3.1.1 Nitric acid (HNO3). excellent grade pure. 3.1.11 Pyridine (C5H5N). 3.1.12 Silver diethyldithiocarbamate (C5H10AgNS2). 3.1.13 Triethanolamine (C6H15NO3). 3.1.14 Ethanol (C2H5OH). 3.1.15 Phenolphthalein (C2OH14O4). 3.1.16 Lead acetate (C4H6O4Pb • H2O). 3.2 Reagent preparation 3.2.1 Sulfuric acid solution (1 + 1). MEASURE 100 mL of sulfuric acid; slowly ADD it into 100 mL of water; MIX it uniformly; COOL it down before use. 3.2.2 Sulfuric acid solution (1 mol/L). MEASURE 28 mL of sulfuric acid; slowly ADD it into water; USE water to dilute it to 500 mL. 3.2.3 Hydrochloric acid solution (1 + 1). MEASURE 100 mL of hydrochloric acid; slowly ADD it into 100 mL of water; MIX it uniformly; COOL it down before use. 3.2.10 Phenolphthalein ethanol solution (10 g/L). WEIGH 1.0 g of phenolphthalein; DISSOLVE it into 100 mL of ethanol solution. 3.2.11 Lead acetate solution (100 g/L). WEIGH 10 g of lead acetate; USE water to dissolve it and MAKE its volume reach to 100 mL. 3.3 Standard substance Arsenic trioxide (As2O3) standard substance. the purity is 99.99% OR the standard substance certified and awarded the standard substance certificate by the state. 3.4 Standard solution preparation 3.5 Materials Lead acetate cotton. DIP the absorbent cotton into the lead acetate solution (10%) for 2 h; TAKE it out and DRY it naturally.

4 Instruments

Note. The glass instruments used shall be soaked in the nitric acid solution (1 + 4) for more than 24 h; USE water to rinse it for several times; USE deionized water to rinse it clean. 4.1 Spectrophotometer. 4.5 Electric heating plate. 4.6 Arsenic determination device (SEE Figure 1).

5 Sample treatment

5.1 Preparation of inorganic samples The “sample treatment” of the inorganic sample may be carried out in accordance with the method as specified in the relevant standards. 5.2 Preparation of organic samples The “sample treatment” of organic sample shall, in addition to the requirements of relevant standards, generally follow the methods below.

6 Determination

6.1 Selection of absorption solution The absorption solution A or the absorption solution B can be selected in accordance with the demands of analysis. During the determination process, the same absorption solution is applied to the sample, blank and standard solution. 6.2 Limited amount test 6.2.1 PIPETTE a certain amount of sample solution and arsenic standard use solution (arsenic content of not less than 5 μg), respectively, into the arsenic generation bottle A; ADD sulfuric acid to a total of 5 mL; ADD 50 mL of water. 6.2.2 In each bottle as mentioned in 6.2.1, ADD 3 mL of potassium iodide solution; MIX it uniformly; LET it stand for 5 min. 6.2.3 USE the visual colorimetric method or USE the 1 cm cuvette to determine the absorbance of the absorption solution at the wavelength 515 nm (absorption solution A) or the wavelength 540 nm (absorption solution B). 6.3 Quantitative determination 6.3.1 PIPETTE 25 mL (or the appropriate amount of) sample solution and the same amount of reagent blank solution; respectively PLACE it into the arsenic generation bottle A; ADD sulfuric acid to a total of 5 mL; ADD 50 mL of water. 6.3.3 ADD 3 mL of potassium iodide solution into the sample solution, reagent blank solution and arsenic standard solution; MIX it uniformly; LET it stand for 5 min; then respectively ADD 1 mL of stannous chloride solution; MIX it uniformly; LET it stand for 15 min; respectively ADD 5 g arsenic-free metal zinc; immediately PLUG the air duct B which is equipped with the lead acetate cotton lead, to make the tip of the air duct B insert into the absorption tube C which contains 5.0 mL of absorption solution A or absorption solution B;

7 Expression of analytical results

Arsenic content in the sample is calculated in accordance with the formula (1).

8 Precision

The absolute difference between the two independent determinations obtained under repeatability shall not exceed 10% of the arithmetic mean.

9 Principles

After digestion of the sample, thiourea is added to reduce the pentavalent arsenic to trivalent arsenic, AND then the sodium borohydride or potassium borohydride is added to reduce it into arsine, which is carried by the argon into the quartz atomizer to be decomposed into atomic arsenic. It produces atomic fluorescence under the excitation of the emitted light from the special arsenic hollow cathode,

10 Reagent

Note. Unless otherwise stated, the reagents used in this method are of analytical pure AND the water is level 1 water as specified in GB/T 6682. 10.1 Reagents 10.1.10 Hydrogen peroxide (H2O2). 10.2 Reagent preparation 10.2.1 Sodium hydroxide solution (2 g/L). WEIGH 2.0 g of sodium hydroxide; DISSOLVE it into 1000 mL of water; MIX it uniformly. 10.2.2 Sodium borohydride solution (10 g/L). WEIGH 10.0 g of sodium borohydride; DISSOLVE it into 1000 mL of sodium hydroxide solution; MIX it uniformly. PREPARE it before use (it may also weigh 14 g of potassium borohydride to substitute sodium borohydride). 10.3 Standard substance Arsenic trioxide (As2O3) standard substance. the purity is 99.99% OR the standard substance certified and awarded the standard substance certificate by the state. 10.4 Standard solution preparation ......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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